COMMUNICATIONS STANDARDS REVIEW

October 1990 Vol. 1.6 Copyright © CSR 1990 1

COMMUNICATIONS STANDARDSREVIEW

Volume 1, Number 6 October, 1990

IN THIS ISSUE

The following reports of recent standards meetings represent the view of the reporter and are not official, authorized minutes of the meetings.

Telecommunications Terminal Equipment Homologation in the United Kingdom........................................... 2

TR-30.3 Ad Hoc, August 15 - 17, 1990, Norcross, GA............................................................................ 5

TR-45.3 Digital Cellular Standards, August 28 - 30, 1990, Calgary, Alberta................................................ 8TR-45 Report.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Working Group 1 - User Needs and Services................................................................................... 9Working Group 2 - Dual-Mode Standards....................................................................................... 10Working Group 3 - Digital Standards............................................................................................ 11TR-45.3 Roster, August 28 - 30, 1990, Calgary, Alberta................................................................... 12

TR-30 Data Transmission Systems & Equipment, September 4 - 8, 1990, Sunnyvale, CA................................ 12TR-30.1 (Modems).................................................................................................................. 12TR-30.2... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14TR-30.3... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15TR-30.4, DTE-DCE Protocols.................................................................................................... 17TR-30 Roster, September 4 - 8, 1990, Sunnyvale, CA...................................................................... 18

CCITT Study Group VIII, Telematic Terminals, September 4 - 14, 1990, Geneva, Switzerland........................... 18Group 3 Facsimile (Q.18).......................................................................................................... 18Group 4 Facsimile (Q.4)........................................................................................................... 20Modulation Techniques for Telematic Services on the PSTN (Q.5)........................................................ 20Application Interfaces (Q.10).................................................................................................... 20File Transfer (Q.27)................................................................................................................. 20Open Document Architecture...................................................................................................... 21Document Application Profiles for ODA (Q.26).............................................................................. 21DTAM (Q.27).... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Multimedia (Q.9)...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21ISDN Terminals (Q.17)............................................................................................................. 22Videotex Protocols (Q.15)........................................................................................................ 22Roster of CCITT Study Group VIII, September 4-14, 1990, Geneva, Switzerland...................................... 22

TR-41 Telephone Terminals............................................................................................................ 23TR-41.1 PABX and ISDN Terminating Equipment............................................................................ 23TR-41.1.2 Private Network....................................................................................................... 23TR-41.3 Telephone and ISDN Terminals....................................................................................... 24TR-41.4 Network Circuit Terminating Equipment Standards............................................................... 24TR-41.7 Environmental and Safety Considerations.......................................................................... 25TR-41.7.2 Bonding and Grounding.............................................................................................. 26TR-41.8 Wiring Standards......................................................................................................... 26TR-41.9 Regulatory Considerations............................................................................................ 26TR 41 Roster, September 10 - 14, 1990, Asheville, NC.................................................................... 28

1991 and 1992 Meeting Schedules.................................................................................................... 291990 Meeting Schedules as of October 5, 1990..................................................................................... 30

COMMUNICATIONS STANDARDS REVIEW

2 Vol. 1.2 Copyright © CSR 1990 October 1990

TELECOMMUNICATIONS TERMINAL EQUIPMENT HOMOLOGATION INTHE UNITED KINGDOM.

A product is considered homologated when all regulatory testing is successfully completed and the license forapproval to sell the product in a specific country has been granted. This article addresses Homologation ofTelecommunications Terminal Equipment for connection to the analog Public Switched TelecommunicationsNetwork (PSTN) in the United Kingdom. It does not address the connection to digital services, as defined under theUnited Kingdom's General Approvals scheme.

DEFINING HOMOLOGATION OFTELECOMMUNICATIONS EQUIPMENT

Homologation of Telecommunications Terminal Equipment that connects to the PSTN (PublicSwitched Telecommunications Network) requires that the equipment be tested to, and complywith, the requirements of multiple standards. These standards can be broken down into thefollowing classes:

• Telecommunications safety• Product safety• Product electromagnetic radiation (EMR)• Product electro static discharge (ESD)• Telecommunications operation

Each country has requirements in all or a subset of the above classes. In some countries, several requirements arecombined, as is the case when telecommunications safety is contained within the telecommunications operationrequirements.

In the United States, UL-1459 covers the requirements of both telecommunications safety and product safety fromthe UL prospective. The dielectric test to verify non-incidence of harm to the network is contained within FCC Part-68. FCC Part-15 is used for product EMR, and FCC Part-68 for telecommunications performance. At present,ESD requirements are not specified in the commercial sector in the United States.

THE UNITED KINGDOM REGULATORYPROCESS

In the United Kingdom, BABT (British Approvals Board for Telecommunications) is the entry point for allapplications. BABT processes an application by first reviewing it for correctness. Once BABT accepts anapplication ( and collects a £900 application fee), one of several test laboratories may be selected to conduct the test.Testing fees are established, payments collected, and the product is then tested for compliance. Test results are thensubmitted to BABT for processing.

If the applicant has obtained an assessment of his manufacturing facility, paid all necessary fees, set up a legalpresence within the United Kingdom, and passed all requirements of the testing process, then BABT will recommendto OFTEL (Office of Telecommunications) that a "License Certificate" be granted. The license holder is the legalrepresentative, and may be the manufacturer's United Kingdom office or a sales representative.

THE APPLICATION NOTES

There are currently 38 application notes available from BABT. The application notes define the standards with whicha product should comply, depending on its application. The manufacturer must verify that it has the correctapplication note and the most current revision.

THE USER INFORMATION CHECKLIST

There are currently 28 User Information Checklists available from BABT. The User Information Checklist listsmarking and labeling guides, and user instructions that must be included within the operation and installationmanuals. The User Information Checklists are for guidance only and should not be treated as defining requirements.



THE STANDARDS

The British Standards for telecommunications equipment evolved in an era when British Telecom was a powerfulgovernment entity. Some of the these test requirements appear to protect the current base of terminal equipment.Other portions seem to have been created to ensure that the existing equipment base would not be affected by newCPE (Customer Provided Equipment).

The following partial list of British Standards represents the most common standards documents for PSTNconnection:

• BS-6305, "General Requirements for Apparatus for Connection to the British Telecommunications PublicSwitched Telephone Network" defines the general requirements for Telecommunications Performance that must bemet for connecting to the PSTN or to a PABX.

• BS-6301, "Electrical Safety Requirements for Apparatus for Connection to Telecommunication Networks" definesthe Telecommunications Safety and Product Safety requirements that must be met. It covers creepages, clearancesand barrier devices that must be qualified for both telecommunications line interfaces and the power supply.

• BS-6789, "Apparatus With One or More Particular Functions for Connection to the British TelecommunicationsPublic Switched Telephone Network" has six parts, each separated into multiple sections. Part 3, Section 3.1covers auto calling of terminal equipment; Part 3, Section 3.2 covers auto answering.

• BS-6320, "Modems for Connection to the British Telecommunications Public Switched Telephone Network"defines the requirements for modems, but contains very little information. Most of the performance requirementsare covered in a SITS (see below).

• BS-6312, "Plugs for use with British Telecommunications Line Jack Units" defines the BT 601A jack used forconnection to the PSTN.

• OTR001, "Technical Requirements for Private Branch Exchanges with Telecommunication Ports" covers allPABX and switching equipment that provides through connections between the PSTN and extension ports.

Thus, a modem that auto-answers and auto-dials would be required to meet all of the above specifications with theexception of OTR001. The problem with the British specifications is that many of the requirements are not clearlyidentified or are not identified at all (as in the case of BS-6320 for modems).

No standards exist at this level for Voice Response or Voice Processing equipment.

THE SITS

Because of inadequacies in the original British Standards, an additional layer of documents was created to delineatefurther requirements for performance and testing. The non-standards are called SITS, or "Special Investigation TestSchedules". Although the SITS are not standards, they are mandatory.

Currently, there are over 35 listed SITS. SITS documents can be updated or new ones added without notice.Selecting the proper SITS can be quite difficult.

THE APPLICATION

The application consists of an application form and a properly-filled-out subset of necessary TISs (TechnicalInformation Sheets, 34 exist currently). All possible documentation about the product must be submitted induplicate to the testing laboratory with the original application to BABT. This can amount to a stack ofdocumentation at least two to three inches thick for even a simple product.

The application, TIS documents and the product information are reviewed by BABT to ensure that the entire packageis correct. If not correct, the applications are returned for additional information. The time needed for rejection andre-submittal can be weeks to months. In some cases, not all of the forms need to be filled out.



THE COMPLIANCE TEST

The chosen test laboratory verifies that the equipment complies with telecommunications safety andtelecommunications performance requirements as set forth in the applicable standards and SITS documents. Atpresent, the United Kingdom does not have product radiation, product safety, or ESD requirements fortelecommunications terminal equipment that connects to the analog PSTN.

When the test laboratory has completed the testing, it forwards a copy of the results to the manufacturer's legal agentand to BABT. If the equipment has not been properly designed and pretested for compliance, additional test cycles arerequired.

Each test cycle can be both expensive and time consuming, as lead times are usually three to four months. Theapplicant should plan on paying £3,500 to £5,000 in test fees for simple terminal equipment, such as a modem oranswering machine.

THE FACTORY APPROVAL

A manufacturing Factory Assessment must be carried out by BABT to ensure that the sample product tested isrepresentative of the products manufactured. The Factory Assessment scheme is defined in BABT Document 340 andseveral appendixes. BABT personnel visit factories much like UL does in the United States. Follow up visits arealso mandatory.

Factory assessment and approval are required for a "License Certificate" for a product. It is important to schedule theassessment visit early. The initial factory assessment is £500 plus travel expenses. Overseas travel expenses aredivided between all factories visited on a given trip. The factory visit assesses quality assurance, manufacturingworkmanship practices, manufacturing process flow, test procedures, material control, change control, testequipment, and test equipment calibration.

The manufacturer must also appoint an Approvals Liaison Engineer (ALE). The ALE is responsible for monitoringall software and hardware changes that affect the Telecommunications products performance and safety. All changesthat affect the telecommunications functions must be reported to BABT. If warranted by BABT, additional testingmay be required to verify compliance.

THE REQUIREMENTS FOR LEGAL PRESENCE

Manufacturers of products that are sold into the United Kingdom are required to have a legal presence in country,should any legal action be necessary. The legal presence can be an international UK office, an office withoutpersonnel that is a registered "Limited" corporation, or a sales representatives corporation. The legal presence mustbe established before a "License Certificate" will be granted by OFTEL.

THE LICENSE CERTIFICATE

When the applicant has met all of the testing requirements, obtained a factory assessment, established a legalpresence in the United Kingdom, and paid all fees, BABT will recommend to OFTEL that a "License Certificate" begranted. The license is for the life of the product, and no additional continuation compliance testing is required,unlike FCC Part-68 in the United States.

The total cost for obtaining a License Certificate is in the range of £4,900 to £6,400 plus travel expenses, providedthat the product passes compliance testing, and that the factory assessments are satisfactory on the first try. This isapproximately $10,000 to $12,000 in US Dollars (as of early October, 1990).

THE FUTURE OF HOMOLOGATIONIN THE UK

BABT is expected to adopt the ETSI (European Technical Standards Institute) ENV41003 TelecommunicationsSafety and EN60950 Product Safety standards by mid-1991, which would replace BS-6301. By 1992, Pan EuropeanHarmonized CISPR-22 specification for radiation is expected to be adopted.



The three inch thick ETSI draft prETS 300 001, also referred to as candidate NET 4 , specifies general requirementsfor connection of telecommunications terminal equipment to the PSTN. The current draft is a compilation ofgeneral interface requirements of 20 countries including the United Kingdom, and, as such, accommodates thehistoric peculiarities of the PSTN for each country.

Although candidate NET 4 contains inputs from the United Kingdom, it remains to be seen when NET 4 , and themany supporting NETs for modems, facsimile, and voice products, will be adopted by the United Kingdom. Don'tcount on 1992 as being the year of total harmonization of telecommunication standards in the European EconomicCommunity.

David Patton, Patton & Associates, Inc. Mr. Patton is a consultant in the Homologation of TelecommunicationsEquipment for North America, Europe, and the Pacific Rim. Tel: +1-602-934-5458, FAX: +1-602-242-7700.

REPORT OF TR-30.3 AD HOCAUGUST 15 - 17, 1990, NORCROSS, GA

TR-30.3 convened an ad hoc Committee meeting on August 15-17, 1990 in Norcross, Georgia at the request ofStudy Group XVII Vice Chairman R. Brandt (dB Consulting). The purpose of the ad hoc committee was to derive aperformance test plan for SGXVII to evaluate modulation/technology performance of contending duplex 2 wiremodems. This evaluation could determine the most appropriate technique to be implemented in what is nowcommonly termed V.Fast.

TR-30.3/90-09051 AH is the official liaison letter from Vice Chairman of CCITT SGXVII R. Brandt to TR-30.3 Chairman J. Douglass. TR-30.3/90-09052 AH , Straw man Performance Table Document submitted byTR-30.3 Chairman J. Douglass, served as the starting place and format for the test suites.

TR-30.3/90-09053 AH , Proposed Configuration of Simulator for Next Generation Test Lines, was submittedby N. Knudsen of Consultronics. The paper cites technical issues such as loop simulation requirements and theaccuracy needed for NI-NI loss and attenuation distortion, given the fact that the loop simulation occurs after all otherimpairments. The paper further cites the overwhelming need for an EIA/TIA-496-B simulator due to the extensiveinstalled based of V.32 modems. Consultronics has a simulator that would comply with, at least, an EIA/TIA-496-B (Interim) simulator, depending on TR-30.3 accuracy demands for the NI-NI line simulation. This newConsultronics Simulator will be able to implement all of the V.Fast Test Suite.

TR-30.3/90-09054 AH , Cascading Test loops with the TAS 100 Family of Telephone Line Simulators,presented by S. Moore of TAS, describes how to implement an interim 496-B simulator using the TAS 100 seriesand an external loop simulator. S. Moore also demonstrated how to implement the V.Fast Test Suite with anexisting TAS 112.

TECHNICAL ANALYSIS

The intent of this meeting was to utilize the expertise of TR-30.3 regarding network parameters and to construct atest plan that is representative of actual U.S. PSTN. It was expected that the impairments placed in each testconfiguration would be representative of the type of transmission facility specified.

The following reference documents were used to construct the test plan:

• End Office Connection Survey, 1982 (EOCS)• T1Q1.1/89-120 - Bell South, Echo Return Loss contribution

The resulting test plan is a set of impairments for each connection that were selected based on stressing themodem,with no attempt to associate any particular set of impairments with a representative transmission facility.The selected impairment's level was at least a percentile that was within the guidelines of the EOCS Study.

The philosophy behind testing V.Fast resulted in a test plan that was stressful and that could be backed up by realtransmission facility performance numbers but without claiming that any individual configuration represented the



actual network. The final test plan was constructed in a similar manner to EIA/TIA-496-A: The impairmentsselected for each individual test configuration were based on actual network parameter statistics from EOCS,although the test represented a particular stress that would hopefully separate the different modulation technologiesthat are contending for V.Fast. Finally, the ad hoc committee agreed that this approach was the only way ofproducing a test plan for the September TR-30.1 meeting in Sunnyvale, CA.

LOCAL LOOP SIMULATION

The majority of TR-30.3 members present insisted that this test plan contain at least 2 wire loop simulators at theinput/output of the test equipment. Loop simulation was determined to be vital to a realistic duplex modem testplan. The issues that centered around the loop simulation were:

• Noise coloring• Near end echo simulation• Far end echo simulation

Noise ColoringThe existing EIA/TIA-496-A method as well as the existing CCITT Rec. V.56 both call for a wideband noisespectrum to be inserted after the modem attenuation distortion. This is not representative of the actual network sincethe noise is distributed over the entire connection. The existing method of inserting noise would lead a modemdesigner to believe that noise enhancement due to linear equalization is a far more serious problem than is the case.The advantage of a decision feedback equalizer over a linear equalizer is less certain when the noise is also colored.

Near End Echo SimulationThe most important argument for having a 2 wire loop simulator in front of a 4 wire (trunk) simulator was toaccurately simulate a near end echo. Indeed, the existing EIA/TIA-496-A simulators would lead a modem designer tobelieve that the near end echo is merely the transmit signal coming back at the modem with a flat spectrum. Theaddition of the loop will create two near end echoes for the modem to cancel. They are the following:

1. The immediate impedance mismatch presented to the modem. This impedance is frequency dependent and willresult in a shaped spectrum inside the modem.

2. The second echo will be attenuated twice by the loop and the 2 wire return loss of the End Office. Although thisecho will be much lower than the first, it will show the full effects of the local loop and End Office reflection andwill have a severely shaped spectrum.

The second echo, although not specifically mentioned in the test plan, may be a critical echo to cancellation.

Far End Echo SimulationThe arguments for the far end echo are the same as near end echo.

EXISTING SIMULATION EQUIPMENT CONSIDERATIONS

There was general agreement that loop simulation was needed, but there were very real and serious concerns that theloops selected could not be reproduced. The resulting agreement was to select only EIA Loops that could easily beimplemented with existing loop simulators. This decision eliminated EIA Loops 6 & 7 because only AEA has aloop simulator that simulates loading coils. These Loops will not be available until November. J. Moran is theonly member with a prototype version of the EIA Loops.

Therefore, the committee selected the EIA Loops 1, 2, 4 and 5. TR-30.3 members present had already performeddetailed analysis on these loops and were quite comfortable with their characteristics and available equipment couldreliably simulate these loops. Known equipment that can implement them are:

• A.E.A. DLS 100 ISDN Loop Simulator• PTT model 5200 ISDN Loop Simulator (recently announced)• T.A.S. 2100 ISDN Loop Simulator



These loop simulators are from the manufacturers that presently produce the EIA/TIA-496-A simulators. All threesimulators can perform this series of tests easily. All are completely automated and could be added to each respectivesimulator's automated test program for the remainder of the impairments for each test configuration.

The final consideration for constructing this test plan was the existing EIA/TIA-496-A simulators' limitations.These limitations are due to earlier implementations that complied with EIA/TIA-496-A but were not flexibleenough to handle some of the variances desired in the implementation of the new test plan. Two out of the threesimulators had implemented line simulations such that attenuation distortion and envelope delay distortion werealways paired together. This implementation does not violate EIA/TIA-496-A.

Given this limitation, the committee was unable to accomplish the desired 4 wire trunk response on many of the testconfigurations because the desired 4 wire test channel would have been EIA-A attenuation distortion and EIA-2envelope delay distortion. This particular combination does not appear in 496-A. After consultation with thesimulator manufacturers, it was decided to use the U.S. Leased Line tariff C4 attenuation distortion and envelopedelay distortion curves. These curves were offered by all three manufacturers. It is important to note that the C4curves were selected as the best compromise for both attenuation and envelope delay distortion.

TEST PLAN DEVELOPMENT

To construct the test plan, the ad hoc committee divided into two groups focusing on:

1. Traditional 4 wire (trunk) impairments such as attenuation and envelope delay distortion, phase jitter,intermodulation distortion (IMD), 1004 Hz loss NI-NI, SNR & and a suggested signal to far echo ratio (S/FE)

2. All echo impairments, loop selection and NI-NI attenuation distortion

For each test configuration, Group 1 submitted the parameters that they wanted for each line to Group 2. Theparameters fell into two categories:

Category 1Intermodulation distortion, phase jitter, 1004 Hz loss NI-NI and the SNR were final values decided by Group 1.

Category 2Attenuation and envelope distortion, and signal to far end echo ratios were submitted to Group 2 under the desiredvalues.

This process was successful because Group 1, modem performance people (mainly from TR-30.1) concentrated moreon the values they deemed necessary to stress a modem receiver for each line, and Group 2, network performancepeople (mainly from TR-30.3), made sure that the overall NI-NI impairments were realizable.

The desired attenuation distortion (AD) had to include the two loops. The final value of AD turned out to be amultiple iteration process with trade offs being made considering the desired AD versus signal to far end echo ratio(S/FE). The S/FE was determined using the T1Q1.1 contribution number T1Q1.1/89-120 from Bell South. Thecontribution was a mini survey of their existing loop population and the trans-hybrid losses that resulted given threedifferent Central Office Switches. This information proved invaluable since there was at least a correlation betweenloop length and trans-hybrid loss based on the Central Offices using Bellcore's (LSSGR) recommended Line BuildOut for balancing hybrids. Group 2 had a statistical distribution of trans-hybrid losses for a given looplength/topology.

After the juggling was finished between loop length, trans-hybrid loss (echo) and AD, Group 2 determined whetherthe 4 wire loss was realistic. If the answer was no, then minor adjustments were made. The test configuration wasthen complete for that particular line. The process was very similar to the one the TR-30.3 Committee used for theCCITT V.Asym Testing in 1989.

The resulting document from the ad hoc meeting is TR-30.3/90-09055 AH . This document will be presented tothe main TR-30.3 committee in September, 1990 (as TR-30.3/90-09061), for final approval and will besubmitted to TR-30.1 as well, as a courtesy. Then it will be submitted to TR-30 for approval to go forward toCCITT as a U.S.A contribution.



Ed. Note: The most current version of this paper as we go to press is the draft CCITT submission presented to TR-30.1 as TR-30.1/90-09050 .

OPEN ISSUES

TR-30.3/90-09055 AH has a few technical problems which will be discussed at the September TR-30.3meeting:

Trunk SimulationThe C4 trunk simulation selected by the ad hoc committee is not an ideal 4 wire trunk. The available bandwidth andgroup delay do not accurately reflect a modern D4/D5 channel bank. Further, the three simulator manufacturerschose a different response through the C4 tariff attenuation and envelope delay distortion templates. This is nosurprise since C4 is not a specified line. However, it was the best that could be done at this meeting.

Intermodulation Distortion (IMD)1. Are the levels of R2 and R3 reasonable and is the measurement point at the modem an accurate reflection of the

actual IMD values?2. Is the 6 (A/B) test set up valid? In other words, is it valid to test for R2 without R3 or R3 without R2?

Evidence from the 1982-83 EOCS study indicates that R2 and R3 tend to track with some offset that could beassigned.

Phase JitterIs the phase jitter simulation a reasonable approximation of actual phase jitter? Are the values and frequenciesselected reasonable?

Jack Moran

Communications Standards Review covers the following committee meetings:

TIA (USA): TR-29 TR-41TR-30 TR-45.3

CCITT: SGVIII SGXVII

REPORT OF TR-45.3 DIGITAL CELLULAR STANDARDSAUGUST 28 - 30, 1990, CALGARY, ALBERTA

TR-45 REPORT

TR-45's charter was discussed, resulting in agreement on the following points:

• The committee's scope is cellular and common-carrier radio systems.• The committee will form liaisons with other standards organizations.• The committee will be responsible for system-level standards.

S. McConoughey (Panasonic) will draft a charter for review at the next meeting.

The status of work within TR-45.1 and TR-45.2 is as follows:

• TR-45.1 is sending out EIA/TIA–553A (the analog base-station mobile-station compatibility standard) for ballot.Changes to the re-scan procedure and release procedure are incorporated.



• TR-45.2 is preparing IS–41B (Intersystem Operations) for ballot. IS–41A is stalled due to a GTE patent onfollow-me roaming. If IS–41A is not approved by the end of the year, it will be sent back to the subcommitteefor modification, and IS–41B will be moot. IS–53 (Cellular Feature Description) is awaiting the results of ameeting with Bellcore on assignment of feature codes. Two reports are being prepared: one on carrier billingrequirements and one on standardizing the BS-to-MSC interface. The CTIA will soon be issuing a new UserPerformance Requirements (UPR) on intersystem operation.

Other highlights of the meeting:

• In TR-45/90.08.30.05 , E. Schimmel (TIA) indicates there is no outstanding IPR (intellectual property rights)barrier to the implementation of IS–54. Concern was expressed that if this is the case, why is CTIA proposing anon-disruption agreement?

• TR-45/90.08.30.06 and TR-45/90.08.30.07 provide information on the organization of standards groupsin Japan.

IS–70 GUIDE TO THE TIA CELLULAR STANDARDS (PN-2716)

TR-45.3.3.3/90.08.29.03 (PN-2716 , Guide to the TIA Cellular Standards) was submitted to the Editorial TaskForce and referred to TR-45 as TR-45/90.08.30.11 . This draft text guide to the TIA cellular standards includescommon reference models (e.g. cellular network models and layered protocol models), an overview of the standards,conventions used (e.g., taxonomies and state diagrams), a common dictionary, and a master index. This contributionwas deferred until the next meeting of TR-45 to allow time for review.

TR-45.3 SUBCOMMITTEE DIGITAL CELLULAR SYSTEMS

A letter to E. Schimmel was drafted and adopted. The letter requests that BNR be told to release the source materialused in last year's voice coder testing.

AD-HOC AUTHENTICATION GROUP

This group was set up to develop recommendations on subscriber authentication and voice/data privacy. As requiredby the International Traffic in Arms Regulations, membership is limited to U.S. citizens, permanent legal residentsof the U.S., and Canadians. Contributions are subject to the export jurisdiction of the Department of State.

WORKING GROUP 1 - USER NEEDS AND SERVICES

TF1 (Features and Services) made additions and changes to IS–71. New appendices will be added as follows: (A)Feature priorities; (B) Analog, dual-mode, and digital-only features; (C) Distinctive alerting list; and (D) Featureactivation code list. An ad-hoc group was formed to study methods for invoking cellular CLASS features. Theirreport is due at the next meeting.

TF2 (OA&M) has been disbanded. Effectively, this means the remaining task force, TF1, is also disbanded. Allwork on IS–71 will now be done at the working-group level.

IS–71 CELLULAR SERVICE DESCRIPTIONS (PN-2717)

IS–71, the Feature Services Document, is now being developed as an official standard. It will define the features andservices supported by the TIA cellular standards. It will eventually incorporate what is now IS–53, Cellular FeatureDescriptions. TR-45.3 will be responsible for IS–71 until it is balloted. Then TR-45 will assume responsibilityfor any updates.

The following contributions modified the new baseline text (TR-45.3 .1 .1 /90 .08 .27 .02 ):

TR-45.3 .1 .1 /90 .08 .27 .04 , Selective Call AcceptanceTR-45.3 .1 .1 /90 .08 .27 .05 , Selective Call ForwardingTR-45.3 .1 .1 /90 .08 .27 .06 , Selective Call RejectionTR-45.3 .1 .1 /90 .08 .27 .07 , Reverse Charging



TR-45.3 .1 .1 /90 .08 .27 .08 , Distinctive Alerting/Call Waiting IndicationTR-45.3 .1 .1 /90 .08 .27 .09 , Calling Number Delivery BlockingTR-45.3 .1 .1 /90 .08 .27 .11 , Advice of ChargingTR-45.3 .1 .1 /90 .08 .27 .13 , Screening List Editing

By November, the chairman expects to forward completed text for IS–71 to TR-45 for review. Features will beprioritized at the next meeting.

WORKING GROUP 2 - DUAL-MODE STANDARDS

IS–54A, DUAL-MODE MS-BS COMPATIBILITY (PN-2398)

WG2 revised IS–54, which was adopted for ballot as PN-2398 (IS–54A). Note that this is not the IS–54Aoriginally planned for release by the end of the year.

• IS–54A will incorporate all the changes adopted to date, and will be issued for ballot as a new standard. It willreplace IS–54.

• IS–54B will support Group-2 features. It will replace IS–54A.

The following contributions modified IS–54:

TR-45.3.2/90.07.26.13, Ambiguity in IS–54 Standard.TR-45.3.2/90.07.26.14, IS–54 Changes for DTMFTR-45.3 .2 /90 .08.29.02 , Proposed Changes to text for Sections 2 and 3 of PN-2215TR-45.3 .2 /90 .08.29.07 , Change Pages for PN-2215TR-45.3 .2 /90 .08.29.08 , Link Layer Continuation Bit for FACCH/SACCHTR-45.3 .2 /90 .08.30.01 , Text for 2.7.3.1.2.3 Word SynchronizationTR-45.3 .2 /90 .08.30.02 , Errata in Speech Coder SpecificationTR-45.3 .2 /90 .08.30.03 , Proposed Changes to IS–54 for Distinctive AlertTR-45.3 .2 /90 .08.30.04 , Modifications to Deferred Contribution TR-45.3.2/90.07.26.14TR-45.3/90.08.30.05 , Suggested Clarification of Issue in IS–54 Rev. 0.

IS–55 DUAL-MODE MS PERFORMANCE (PN-2216)

The following contributions modified IS–55 (PN-2216) baseline text (TR-45.3 .2 .1 /90 .08 .29 .01 ):

TR-45.3 .2 .1 /90 .08 .28 .07 , Corrections to Spectrum Noise Suppression in IS–55TR-45.3 .2 .1 /90 .08 .28 .09 , Synchronization Acquisition Time

IS–56 DUAL-MODE BS PERFORMANCE (PN-2217)

TR-45.3 .2 .1 /90 .08 .28 .08 , Corrections to Various Transmitter Tests in IS–56, modified IS–56 (PN-2217)baseline text (TR-45.3 .2 .1 /90 .08 .28 .10 ).

CONFORMANCE TESTING

In TF1/2 (MS/BS Requirements) , conformance testing occupied much of the discussions: specifically, bit-error-rate performance in the presence of noise, interference, receiver motion, and delay spread. The big issue is stillcarrier-to-interference ratio (CIR) and its effect on system capacity.

TR-45.3 .2 .1 /90 .08 .28 .05 and TR-45.3 .2 .1 /90 .08 .28 .06 present the carriers' point of view, summarizedas follows:

• If a CIR better than 18 dB cannot be achieved in an environment characterized by signal dispersion and fading,dual-mode cellular systems will not achieve anything close to the 10-times capacity stipulated in the CTIA's UserPerformance Requirements. Therefore, the minimum performance standard should be tight enough to guaranteeincreased capacity.



• No manufacturer has provided convincing reasons or data showing why a CIR of better than 18 dB cannot beachieved.

The manufacturers make the following arguments for a relaxed spec:

• An extremely complex equalizer will be required to compensate for the severe dispersion specified in theminimum standard. It will make mobile stations large, expensive, and power hungry.

• A complex equalizer may actually degrade performance and system capacity under typical dispersion conditionsdue to compensation noise. Setting a stringent performance standard may actually decrease system capacity inmost markets for the benefit of marginal increases in a few. This is a poor tradeoff.

• There is no clear experimental evidence that proves or disproves that a given level of CIR results in a particularsystem capacity.

Some values for Receiver Sensitivity and CIR Requirements were adopted. If a two-thirds majority does not agreeto a set of completed tables by the end of the next meeting, the issue will be bumped up to the working group.

OTHER TOPICS

• –30 dBc will be used as the limit for carrier feedthrough in IS–56.

• A page-by-page review of PN-2216 (TR-45.3 .2 .1 /90 .08 .29 .01 ) and PN-2217 (TR-45 .3 .2 .1 /90 .08 .28 .10 ) was started to identify errors and inconsistencies. The review should be completed atthe next meeting.

TF3 (Voice Coder Testing) rejected an ad-hoc-committee report that recommended using Degradation MeanOpinion Score (DMOS) for subjective testing of the IS–54 coder. Instead, paired comparison subjective testing willbe tried.

The question of whether to test with or without channel coding was raised in Working Group 2. As a result, theTask Force was asked to specify a minimum error rate for corrected Class-1 bits that would not significantly degradedecoder performance.

TF4 (Signalling and Protocol) discussed signalling for the Group-2 and Group-3 features described in IS–71.

TR-45.3 .2 .4 /90 .08 .27 .04 , from T. Sato of Oki America, proposes a method for sending fax and data over thedigital traffic channel. It uses a modification of V.110 to transfer control information over the digital channel. It doesnot support standard modem to modem protocols. The contribution was deferred until the next meeting pendingadditional contributions.

WORKING GROUP 3 - DIGITAL STANDARDS

In TF1 (Digital Control Channel Matrix), a new matrix was presented that incorporates all previouscontributions. It was then modified to incorporate company entries from TR-45.3 .3 .1 /90 .08 .30 .04 , 05 , 06 ,and 09 . TR-45.3 .3 .1 /90 .08 .30 .04 from Motorola contained a proposed voting order that was amended andadopted as a basis for proceeding.

An ad-hoc group was formed to study the nature of Layer-2 procedures for the Digital Control Channel.

TF2 (Half-Rate Voice Coder) adopted a technology-assessment procedure proposed in TR-45.3.3.2/90.08.27.03. On one key issue, TF2 deviated from the proposal and accepted the recommendation of an ad-hoc bit-rate-selection group: "Use 6400 bits per second." By the next meetings in October, the details of theassessment will be finalized. The technology assessment should be completed by June, 1991, and if the technologyis judged to be acceptable, standardization of a half-rate coder will then proceed.



Condensed from Cellular TechNotes, August, 1990. Next Generation Information Consulting, Alan Sacuta,V:403-251-1319, F:403-251-4414

TR-45.3 ROSTER, AUGUST 28 - 30, 1990, CALGARY, ALBERTA

Peter Nurse NovAtel (Chairman,TR45.3)

AGT Allan AngusAstronet Tak ImamuraAstronet David DeVaneyAT&T John A. MarinhoAT&T Phil TreventiBell Atlantic Mob. Richard AmedenBell South Mobility Thomas E. RichterCTIA Mike HirschEricsson Radio Sys. Ron BohaychukEricsson Radio Sys. Dominique JodoinEricsson Radio Sys. Barry KrantzEricsson Radio Sys. Krister RaithGE Corp. R&D Howard LesterGTE Labs John KetchumHNS Nancy NeigusIMM Al SacutaMotorola Gary CristianoMotorola Thomas Hart

Motorola Ed KleinMotorola Dave SattlerNEC America Stephen S. JonesNEC America Edward D. OrnelasNEC America Jack WeissingerNokia Jaakko HulkkoNokia Kimmo MyllymakiNorthern Telecom Rechard LevineNorthern Telecom Wing F. LoNTI Stewart MorrisOki Electric Takuro SatoPac Tel Cellular Alan CameronPac Tel Cellular Jim ProffittPanasonic Sam McConougheyRogers Cantel Inc. P.F. NgSony Simon MizikovskyTeknekron Comm. Nan-Sheng LinUS Govt. Dale Nunley

REPORT OF TR-30 DATA TRANSMISSION SYSTEMS & EQUIPMENTSEPTEMBER 4 - 8, 1990, SUNNYVALE, CA

TR-30.1 (MODEMS)

LIAISON/MEETING REPORTS

J. Bingham (Liaison to TR-29) presented TR-30.1/90-09041 . TR-29 has embarked on a new study. All aspectsof Group 3 fax communications are being re-examined (protocol, modulation, etc.) for a "High Performance"facsimile. One of the initial outputs of this work is a proposed liaison from SGVIII to SGXVIII proposing a newjoint study. This study would shift the data signalling rate decision from the fax protocol to the modem in an effortto come to the maximum signalling rate more rapidly. A new top data signalling rate above 14400 bit/s was alsorequested. This liaison is being proposed to the concurrent SGVIII meeting in Geneva.

R. Stuart (XVII Question 3 Rapporteur - High Speed Duplex Modems) gave a short verbal report of the Julymeeting in Baltimore and distributed the attachment to his official Rapporteur's report (TR-30.1/90-09048),which addressed the proposed changes to V.32. (Ed. note: Please see CSR Vol 1 #5 (July, 1990) for a report of thismeeting.)

V.32BIS

J. Payton (Editor, V.32bis) briefly presented TR-30.1/90-09039 , a copy of the paper he sent to Geneva outliningthe changes to Draft recommendation V.32bis (CCITT Circular #38 Annex 2). These changes were acceptedat the Baltimore Rapporteurs meeting.



V.17

R. Brandt (dB Consulting) brought up the issue of intellectual property. He suggested that those organizationswhich had submitted patent statements when Recommendation V.33 was approved should consider whether theyshould submit similar statements for V.17, since V.17 appears to be based on the same technology.

AUTOMODE

T. Nixon (Hayes) presented TR-30.1/90-09046 , a proposed USA contribution to SGXVII addressing a change tothe Automode Annex to V.32bis. This paper outlines problems experienced by Hayes when attempting to interworkwith modems that claim to be V.22bis modems but are not totally compliant with the Recommendation. Twoproblem areas of non-compliance were identified: 1) Modems that cannot detect 2100 Hz when phase reversals (perV.25) are present, and 2) Modems that require a longer detect time than the 611 ms specified in V.22bis. It wasestimated that over a quarter million modems in the field have these problems.

The proposed "fix" for these problems was to extend the transmission of USB1 signal by 1500 msecs. It wasrecognized that this would require retrofits for already shipped V.32 Automode modems and in some cases extend thehandshake by 1.5 seconds. Considerable discussion followed about the need to be compatible with "non-compliant"modems. It was agreed to send this contribution forward as a proposed USA contribution with some minor editorialchanges. (Ed. note: This document has been given a Study Group D number of D-56 .)

AUTOMODE DRAFT USA STANDARD

K. Jones (TR-30.1 Editor - Automode) presented TR-30.1/90-09042 , the latest version of the draft USA Standardfor Automoding. Considerable discussion took place over the need to specify calling tone.

T. Nixon presented some proposed text for a CCITT contribution on this subject which was accepted by the meetingas a proposed USA Contribution. In essence, it replaced the requirement to "go silent" with "complete theautomatic calling procedures as specified in V.25". This wording allows the manufacturer to go silent or sendcalling tone. (Ed. note: This document has been given a Study Group D number of D-55 .)

MODEMS EXTENDING BEYOND 14400 BIT/S

D. Forney (Codex) presented TR-30.1/90-09040 . This paper outlines the advances in modem technology/theorythat have taken place since V.32 was adopted. The paper addresses multidimensional coding, constellation shaping,channel maximization (variable baud rate/carrier frequency) and pre-equalization. Signal to noise gains were claimedfor each of these aspects. Although primarily a tutorial paper, conclusions were drawn about the best approach foreach of these areas. A final conclusion was that these advances in single carrier technology obviated a multi-carrierapproach. J. Bingham (Telebit) disputed this point. After some discussion, the paper was approved for presentationto SGXVII as a Company Contribution.

Y. Goldstein (GDC) presented TR-30.1/90-09037 , a proposal for a single carrier multi-dimensional codingscheme for the new high speed modem study. This paper addressed coding issues only and proposed the use of a"ring" coding approach. While this approach does not provide the shaping gain suggested by the Codex paper, it hasthe advantage of lower power and less delay.

J. Bingham (Telebit) presented TR-30.1/90-09049 , a tutorial on the multicarrier approach. This paper had beenpreviously presented at the Baltimore Rapporteurs meeting. The main advantages claimed for multicarrier weremaximization of the channel throughput (adaptability) and better immunity to impulse noise. During thediscussion, J. Bingham confirmed that the gains claimed by the use of pre-coding, multi-dimensional coding andshaping were equally applicable to multi-carrier. He will present papers in the future on echo-cancelling andindicated that Telebit has developed an echo-canceller for a multicarrier system. He noted that echo-cancelling in amulticarrier environment may offer some implementation advantages. This paper was approved for presentation toSGXVII as a Company Contribution.

J. Moran (representing TR-30.3) gave a detailed report on TR-30.1/90-09050 . This paper is a proposed USAcontribution to CCITT on Impairment Combinations to be used by the Rapporteurs Group on High Speed modems



to evaluate various candidate proposals. This paper had already been approved by TR-30.3 and was offered here forinformation purposes only.

TELECOMMUNICATIONS DEVICES FOR THE DEAF (TDDS)

R. Brandt (dB Consulting) presented TR-30.1/90-09044 which supplies the promised pertinent information onthe TDD signal taken from the earlier aborted work by TR-41. There was little discussion.

T. Nixon (Hayes) presented TR-30.1/90-09045 , a compendium of electronic mail exchanges on a forum thatdeals with the problems of the hearing impaired. This information was offered as background for the work on thisnew project.

After this presentation, R. Brandt asked that the group consider how this work was going to be progressed. Hespecifically requested a candidate for editor.

V.14

F. Lucas (GDC) presented TR-30.1/90-09038 , which identifies an error in the Blue Book text ofRecommendation V.14. The word "stop" was exchanged for the word "start" resulting in text that, if followed,would make it impossible to send a "Break Signal". This paper was approved as a proposed USA contribution.

CALL SELECTION

J. Decuir (Everex) presented TR-30.1/90-09043 , a copy of a TR-29 project proposal. This paper proposes thestudy of a procedure ("call selection") to correctly direct an incoming call to a voice terminal, a fax machine or a datamodem when the three devices share the same telephone line. The paper was for information only.

K. Krechmer (ACTION Consulting) presented TR-30.1/90-09047 , an issue paper on call selection. It highlightsthe scenarios that need to be considered in the study of call selection, and concludes that the most reliable solutionwould incorporate the call direction function in the DCE.

Dick Brandt, dB Consulting

TR-30.2

SP-2232

The main focus of the TR-30.2 meeting was the review and resolution of the comments and unfavorable ballotreceived as a result of the industry ballot on SP-2232 , revision of EIA/TIA-232-D. The unfavorable ballot wasreceived from IBM. Favorable ballots with comments were received from: Verilink, Data Switch Corp., AMP Inc.,Motorola/Codex, Hayes Microcomputer Products and UDS/Motorola. The comments and the unfavorable ballotaddressed areas of misunderstanding and areas requiring additional clarification of the text.

Of significant interest is the addition of an appendix which will provide guidance for the length of cable between twopieces of equipment using EIA/TIA-232-E. For many years, this standard had been misunderstood to limit cablelength to 50 feet. Prior to the publication of EIA-232-D, the standard recommended the use of short cables (each lessthan approximately 50 feet), but stated that longer cables were permissible, provided that the resulting loadcapacitance of the cable did not exceed 2500 pf. The new appendix will not specify the exact cable length, but willprovide users with guidance in determining the maximum cable length based on the data rate and cable characteristics.

Although none of the comments resulted in significant technical changes to the draft standard, sufficient changeswere incorporated to necessitate a default ballot. After the editor makes the changes to the document and themembership has had an opportunity to review the revision, the default will be underway. It is the intent of TR-30.2that this occur prior to its December, 1990 meeting.



DAD TO ISO 2110

The committee recommended a YES ballot from the United States to ISO/IEC on the ballot addendum to ISO 2110,which adds the pin-out for an interface similar to EIA/TIA-530. This pin-out is being incorporated into the revisionof EIA/TIA-530 under PN-2300 .

PN-2300

The editor for PN-2300 (to become EIA/TIA-530-A when approved) provided a second draft of the standard. Thiswork will be completed at the December meeting.

REVISION OF ISO 7480

The revision of ISO 7480, Start-stop Transmission Signal Quality at DTE/DCE Interfaces, brings no majortechnical changes to the standard. The committee found no problems with the work and had no comments to forwardto the September ISO/IEC meeting.

PN-2256

PN-2256, work on the revision of EIA-334, will be on the agenda for the December meeting.

Fred A. Lucas

TR-30.3

The draft minutes of the June TR-30.3 Meeting (TR-30.3/90-09050) were reviewed and accepted as modified.TR-30.3/90-09060 is the TR-30.3 Document Register for 1990

TR-30.3/90-09058 , Engineering News May/June 90 Issue, was distributed for information purposes only. Theexcerpt covered the proper usage of the most commonly misused or misspelled technical words.

FCC PART 68 ISSUES

J. Douglass presented the letter that he had written on behalf of TR-30.3 to FCC Part 68 administrator Bill VonAlven (TR-30.3/90-09049). The letter expressed TR-30.3's concerns over both the data jack in premise wiringissue and the make busy issue. There is little or no interest in pursuing a DTMF make busy solution at the presenttime because no DTMF protocol has been agreed upon in the U.S. Each switch manufacturer is offering its ownversion of signalling for a make busy condition called "Do Not Disturb."

J. Douglass distributed a section from the minutes of the T1Q1.1 meeting in Boulder, CO,. April, 1990 (TR-30.3/90-09056 ) acknowledging his presentation at T1Q1.1 on problems with availability of data conditionedservice (e.g., R545 jacks). No specific action was taken at the meeting.

The current issue of Billboard (TR-30.3/90-09057) reports on J. Douglass's presentation at the FCC Part 68Open Forum Meeting in June of this year. The Make Busy Issue, the Data jack and data conditioned loops arecovered.

FCC Part 68 Form 730 August 90 (TR-30.3/90-09059) is the most recent issue of Form 730. It includes thelatest wording on the availability of DTMF controlled make-busy. It was noted that the protocol for enabling anddisabling make busy and being notified of the initiation of the function does not currently exist.

LIAISONS

T1Q1.1 SWG on VBDJ. Moran reported on the recent events at T1Q1.1 and in particular, the events/issues that transpired during the newlyformed T1Q1.1 Subworking Group on Voiceband Data(T1Q1.1 SWG-VBD). The SWG-VBD is moving ahead onboth a leased line standard and an enhanced voiceband data parameter section in the next release of ANSI T1.506



-Switched Exchange Access Network Standard (SEAN). In both cases, the committee has requested that TR-30.3consider modem performance susceptibility to transients. The answer that TR-30.3/TR-30.1 provides will greatlyimpact the performance limits that T1Q1.1 recommends for transients for both leased line and dial.

The leased line standard (now in progress) is using the Bellcore publication TR-TSY-000335 Issue 2, May, 90,entitled "Voice Grade Special Access Transmission Parameter Limits and Interface Combinations," as a straw mandocument.

IEEE Committee P 743J. Moran reported that T1Q1.1 SWG-VBD would be in close liaison with the IEEE P 743 Committee regardingtransmission characteristics and their measurement. Serving as a liaison from IEEE P 743 Committee (TIMSmeasuring equipment), he reported that he had informed T1Q1.1 SWG-VBD that P 743 was presently consideringseveral new measurement techniques to enhance measurement of voiceband data transmission signals. Presentlyunder consideration at P 743 is the use of the 21 tone signal for measuring signal to total distortion. Another recentproposal was to have the TIMS equipment generate a CCITT V.29 Modem signal and measure the area around theconstellation as the modem signal to total distortion ratio.

In closing his liaison report, J. Moran stressed that the many positive things happening in voiceband data will notcontinue for long without modem company involvement.

TEST SUITE FOR CCITT SGXVII

The majority of this meeting was spent on the Test Suite for SGXVII. The goal was to review TR-30.3/90-09055 AH created by the ad hoc committee in August. TR-30.3/90-09061 is the draft minutes from themeeting in Norcross, Georgia.

J. Douglass presented an overview of the process that had taken place in the formation of the Test Suite (TR-30.3/90-09055 AH). (Ed note: Please see the report on the TR-30.3 ad hoc meeting in this issue.) J. Douglassstated that this document and the process that created it does not reflect the process or the values that will eventuallyend up in EIA/TIA-496-B. The Test Suite was created solely to stress modems and was designed based on networkstatistics. It does not reflect any particular transmission facility on a given test configuration. The slowlyprogressing 496-B will reflect actual transmission facilities on a given connection. For example, if the connectionsimulates an all digital connection, then impairments like phase jitter, amplitude jitter, frequency offset of either thereceived signal or the echo (phase roll) and excessive NI-NI loss will not exist on that connection. Impairments suchas timing slips, drop outs and digital bit stream errors will appear on that connection.

Two significant changes to the original test suite were made:

1. Test Configuration 6A and 6B were merged together, leaving a single Test Configuration 6

2. The U.S. Leased Line C4 curve was changed to the Japan NTT-1 line for the 4 wire trunk attenuation andenvelope delay delay distortion curves

Test Configuration 6A and 6BTest configuration 6A and 6B were originally placed in the test suite to stress the modem with independent individualintermodulation distortion orders. This allowed separate assessment of susceptibility to second order (R2) or thirdorder (R3) distortions. D. Harmer (Rockwell) questioned the usefulness of these independent tests, since it wasunlikely that a line would have R2 = 38 dB and R3<53 dB. A close review of the EOCS study revealed that R2 andR3 in fact tend to track. J. Moran and D. Moon reviewed the EOCS study for a reasonable formula to relate R2 toR3. D. Harmer stated that 496-A used 2 dB difference between R2 and R3. After some discussion, everyone agreedthat the intermodulation distortion products R2 and R3 do track each other but that the third order (R3) distortionshould start at a point that was 2 dB worse than the second order (R2). The formula for test configuration 6 wasreduced to :

R3 = R2 + 2 dB



Attenuation Distortion Curve NTT-1The other major change was the elimination of the C4 curve and its replacement with the Japanese NTT-1 curve.The goal was for the 4 wire trunk filtering response to resemble a D4/D5 channel bank. Neither the attenuationdistortion nor the envelope delay distortion curves of the C4 curve were close enough J. Bingham (Telebit)suggested using Japan's NTT-1 curve. The three simulator manufacturers present provided their versions of the NTT-1 curves, labeled as follows:

1. AEA/Consultronics NTT-12. PTT NTT-13. TAS Japan -1

The document was approved.

Ed note: It was subsequently submitted to TR-30.1 as TR-30.1/90-09050 , and then forwarded to CCITTSGXVII as the U.S. recommended Test Suite for determining modulation/technology performance of contendingduplex 2 wire modems. (V.Fast). It has been numbered D-58 by U.S. State Department Study Group D.

Jack Moran

TR-30.4, DTE-DCE PROTOCOLS

The minutes of the 10th meeting (TR-30.4/90-06017) were approved.

LIAISON REPORTS

T. Nixon reported that he received two documents from R. Brandt (too late for duplication) that will be presented atthe upcoming meeting of ISO/IEC JTC 1/SC 6 in Australia. The documents present AFNOR's (French nationalstandards organization) views on Escape from Data Phase in V.xy, and their comments on the USA's previousCCITT contribution of a proposed draft AT command set recommendation. These views conflict with existingopinion in the USA. There is likely to be some discussion on this topic at SGXVII in October. (Ed. note: Thesedocuments have since been distributed as TR-30.4/90-12022 and TR-30.4/90-12023 , respectively.)

J. Decuir reported on progress of the Facsimile DCE work in TR-29.2. He presented two documents. TR-30.4/90-09018 presents the current status of five TIA projects related to fax DCEs. TR-30.4/90-09019 is thefirst draft of work under PN-2724, DTE-FAX DCE Data Link Protocol. It will be discussed at the next meeting.

ASYNCHRONOUS DIALING AND CONTROL (PN-2120)

The primary matter for consideration at this meeting was developing a USA position on the issues raised in theCCITT Study Group XVII Question 14 work plan (see document TR-30.4/90-06016). After discussion, anediting group convened to prepare document TR-30.4/90-09020. The full committee considered the work of theediting group, suggested some minor changes, and unanimously approved document TR-30.4/90-09020R1 to goforward as a proposed USA contribution to CCITT Study Group XVII.

Ed. note: TR-30.4/90-09020R1 was subsequently approved by TR-30 (TR-30/90-09010) and US CCITT StudyGroup D (Document D-54), and has been forwarded to the CCITT for consideration at the October meeting of StudyGroup XVII.

Toby L. Nixon



TR-30 ROSTER, SEPTEMBER 4 - 8, 1990, SUNNYVALE, CA

Donald O'Connor Racal-Milgo (Chairman, TR-30.1)Fred A. Lucas General DataComm, Inc. (Chairman, TR-30.2)Jack Douglass UDS (Chairman, TR-30.3)Toby Nixon Hayes (Chairman, TR-30.4)

ACTION Ken KrechmerAMP, Inc. George LawrenceAT&T Richard Brandt (dBConsulting)AT&T Krishna MurtiAT&T Paradyne Bob ScottCodex Corp. Jack MoranCodex Dave ForneyCodex John PaytonCSR Elaine BaskinCompaq Lee McCrocklinData Switch Corp. Stan SchreinerDEC Ralph DieterEverex Joe DecuirGDC Bob DupuisGDC Yuri GoldsteinGDC Mike ZiehlHayes Toby NixonIntel Thomas Barnes

Intel Eric SamsonIntelligent Modems Laura PreeceMaxim Garry ShapiroMotorola Dave KolkmanNational Semi. John GoldieNorthern Telecom Erik HanssonOctocom Systems Eldon AndersonOctocom Ken JonesPenril Dick StuartRockwell Int. Don HarmerR.Scott Associates Munther QubainSierra Semi. Mohammed HunaniTelebit John BinghamTelebit Art CarlsonTelebit Samuel PaiUDS Jay BainVerilink Robert BeebeVerilink William Buckley

REPORT OF CCITT STUDY GROUP VIII, TELEMATIC TERMINALSSEPTEMBER 4 - 14, 1990, GENEVA, SWITZERLAND

Study Group VIII is responsible for the T. series of Recommendations, which deal with facsimile, Teletex, Videotex,audiographics teleconferencing, and document architecture. The work covers communications applications andapplication layer protocols.

The SGVIII Chair is W. Staudinger from the Federal Republic of Germany (Bundespost FTZ). There are five ViceChairs and four Working Parties, as shown in Table 1.

This was the first meeting of SGVIII at which Resolution 2 Procedures were invoked. Resolution 2 proceduresdirect a Recommendation ready for final approval to be circulated to the Study Group members as a ballot. Therecommendation is approved if 70% of the votes returned are positive.

GROUP 3 FACSIMILE (Q.18)

Almost half of the time allotted to Question 18 (Rapporteur: B. Revillet, France Télécom) was taken up withdiscussions on G3-ISDN. The designation G3-ISDN is now the accepted designation, rather than G3bis. TD-351 ,a report from the Associate Rapporteur, A. Guiseppini (Italian Administration) provided a technical evaluation of theproposals for G3-ISDN and G4 in the light of the service requirements formulated by Study Group I. TD-351 wasaccepted in spite of attempts to substantially modify the text.

The technical evaluation was based on two principal technical contributions: D-110 from the UK and D-162 fromthe US. These papers provided modifications to Rec. T.30 to allow high speed operation over ISDN. The UKcontribution discussed the relative efficiency of the G3 versus the G4 protocol.



Vice Chairs Country Working Party ChairsBernard Marti France (France Telecom)V. Sivakov USSRY. Yamazaki Japan (KDD) Chair, WP 1Alan Pugh UK (Matsushita Graphic Comm.) Chair, WP 2Andrea Macchioni Italy (Ministry of Communications) Chair, WP 3*Herman Silbiger USA (AT&T) Chair, WP 4

*Working Party Chair only

Table 1. Vice Chairs and Working Party Chairs of SGVIII

The US contribution (D-162) provided only minor modifications to T.30. It uses the framing provided by the ErrorCorrection Mode (ECM) when operating over digital networks. Calls are initiated as "analog" calls, using the 3.1kHz bearer capability. By means of a bit in the DIS/DCS, 64 kbit/s digital capability is indicated. If the calledterminal has the 64 kbit/s capability, a request for in-call modification of the B-channel to 64 kbit/s is issued. It wasagreed that in-call modification had not yet been accepted by SG XVIII. If in-call modification is not available, thenthe techniques described in T.90 (TD-427) for G4-G3 interworking would have to be used.

The UK contribution (D-110) provides for a more radical change to the T.30 protocol, since it is based on "fullduplex" operation. Image data is transmitted continuously. If the receiver detects an error, a request forretransmission is issued. There were no technical challenges to the two contributions.

Guiseppini's report pointed out several advantages for G3-ISDN. It provides for intrinsic compatibility with existingG3 equipment, since it uses the same protocol. G3-ISDN is more efficient by an estimated 10% to 106%, especiallyin the case of satellite circuits, since it only uses three turnarounds. (A Japanese contribution [D-187] on G4proposed concatenating the lower layers, reducing the number of turnarounds.)

The report is being sent to SGI. If SGI decides to allow the Telefax 3 service over ISDN, SGVIII could provide thetechnical recommendations. Guiseppini was appointed liaison to SGI and will present the report personally. Aliaison was also sent to SGXVIII requesting them to investigate in-call modification for use by G3 (TD-416).

Other accomplishments by the G3 group in this session were the completion of amendments to RecommendationsT.4 and T.30 regarding the use of T.6 encoding and high speed modems (TD-353). T.6 encoding can only be usedwith ECM. Two modes of high speed modem operation were defined. In V.33 mode, equipment may now operateat 14.4 and 12 kbit/s; in V.17 mode, equipment may operate at 14.4, 12, 9.6 and 7.2 kbit/s. A revision of Rec.T.35 on the assignment of country and manufacturer's ID for use in the NSF was also completed (TD-365). At theStudy Group Plenary, the Resolution 2 procedures were invoked for these amendments, with no negatives.

Agreement was not reached on how the higher resolutions should be invoked. It was agreed that both mm-based(multiples of current G3 resolutions) and inch-based (multiples of 100 pels/inch) should be allowed, including200x200 pels/inch. However, the method of assigning the bits in the DIS/DCS table could not be agreed upon, norwas agreement reached on which mm-based and inch-based resolutions would be required to interwork. TD-382Addendum 2 shows the latest proposed table of DIS/DCS bits. This matter will continue at the March, 1991meeting.

In the discussion on the character mode for G3, originally proposed by the UK, France introduced an extensiveproposal, including suggested character sets, and control functions (D-136 , D-137). Although no conclusionswere reached, it seems likely that the character mode will be accepted by the end of the study period.

In D-109 , the UK proposed that the CNG signal be revised to contain additional information which could be usedby the network. The meeting agreed that such a signal could be designed and used by network DCME (DigitalCircuit Multiplication Equipment) to identify G3 facsimile parameters, and that other network equipment might alsofind such a signal useful (TD-413). There was also some discussion on amending the format of the CNG tone asan aid to the network regarding the type of destination terminal required. A liaison was sent to SGXV (TD-414).



It was decided that the access of G3 to MHS using control documents (D-181) should principally be handled by thequestion on Telematic Interworking responsible for Rec. T.330.

It was agreed that Q.18 should start work on an interworking procedure between fax and voice answering devices.

Finally, liaison statements based on a French contribution (D-118) were sent to SGXVII to request short trainfacility for V.29 to allow the use of that modem in other Telematic services such as Teletex and Videotex (TD-417Annex 3).

GROUP 4 FACSIMILE (Q.4)

The high resolution and gray scale test charts proposed by the US were accepted, and will be submitted to Resolution2 procedures at the March, 1991 meeting. Rapporteur for Q.4 is H. Wada (KDD).

A contribution from France (D-154) proposed to modify the layer 3, 4 and 5 procedures by concatenating them.This proposal, apparently motivated by possible competition of G3-ISDN, would increase the efficiency of G4.Because it would be contrary to OSI principles, a liaison on the subject was sent to SGVII. Attendance and interestin G4 remains low, except for the Japanese. The use of the JPEG algorithm for color was discussed, but nosubstantive work on color fax was done.

MODULATION TECHNIQUES FOR TELEMATIC SERVICES ON THE PSTN (Q.5)

B. DeGrasse (Rockwell) is the rapporteur. It was agreed to begin the work on a high performance modem for G3facsimile. US contribution D-157 (with the addition of TD-350) was the request to begin this work (see CSRVol 1 #5, August, 1990, page 21). The work will be done in conjunction with Q.18 (G3 apparatus) to ensureoptimization of the protocol.

A short train (less than 50 ms) sequence for use in teletex, videotex and facsimile is requested and this request will bepassed to SGXVII.

SGXV is developing procedures to use DCME to improve trunk circuit utilization. D-306 and D-307 fromComsat discuss the details associated with decoding G3 facsimile signals into digital representations for efficienttransmission over long haul facilities. They also request further assistance from SGVIII.

D-305 discusses the work needed to develop interworking procedures for voice, data and facsimile DCE. A jointmeeting (SGs: VII, VIII, XV, XVII, XVIII) to progress this work is planned for December 10-11, 1990, in NewJersey.

Concerns were again raised regarding patents covering V.33 and V.17, but were allayed by standard patent statementsfrom the major companies.

TD-293 makes an editing change (previously discussed in TR-29; see CSR, Vol 1 #5, August, 1990, page 17) toV.17 to align it with T.30 timing.

APPLICATION INTERFACES (Q.10)

APIs are being treated in Q.10, the Teletex question (rapporteur P. Maurice, France Télécom), although the APIs areintended for all Telematic applications. A mandate for the work was agreed upon. It envisages an interface to allowstandard software products to access the telematic protocols easily, the Appli/Com interface, and the Com/Protocolinterface which enables standard equipment to be connected to the network easily. This work is based on the Frenchand German contributions (D-183 and D-185) which are likely to become the accepted solutions.

FILE TRANSFER (Q.27)

The work on defining a common file transfer syntax for the Telematic Services was assigned to Q.27, DTAM, at theBudapest meeting. The associate rapporteur is K. Nakao, KDD. A structure for this work was agreed upon. Thework consists of three parts: Common file attributes, file access attributes, and file transfer protocols. The last is



specific to each of the services, and should therefore be treated by each of them. The need for access control willhave to be decided by each service, and will therefore be delayed until those decisions are made.

Work proceeded on the definition of file attributes in common for all applications/services. An 80% commonalitywas found between the requested attributes for the Teletex transparent mode, the G3 binary file transfer (BFT), andthe MHS file transfer. Depending on received contributions, it was expected that agreement could be obtained ondefinitions for these attributes at the March, 1991 meeting. ODA Document Profile attribute definitions for filingand retrieval will also be taken into account. It is likely that two file transfer syntaxes will be defined, a binarysyntax using ASN.1, and a character based one using T.50. Agreement is expected by the end of the study period.The current status is described in TD-405 .

D-155 (US) modifies an ASN.1 production rule in draft T.bft.

OPEN DOCUMENT ARCHITECTURE(ODA, Q.27)

As a first for SGVIII (and probably for CCITT), final approval of text for additions to the ODA standards wasachieved at the same meeting by CCITT and ISO delegates. Five additions were approved via the Resolution 2procedures:• Alternative representation (TD-363)• Styles extensions (TD-358)• Security (TD-371)• Tiled Raster Graphics (TD-354)• Annex E to Rec. T.411 (ODA over MHS) was amended to conform to some changes in MHS (TD-359)The color addendum on color capability on ODA required too many changes for consideration at this meeting (due toISO ballot comments), and will be voted on at the March, 1991 meeting, as well as sent out for a second DAD inISO. The same applies to the Document Application Profile Pro Forma Appendix to Rec. T.412. Due to theintensive work on Res. 2 procedures, no substantive work was done on other extensions to ODA. The Q.27rapporteur is H. Silbiger, APPLICOM.

DOCUMENT APPLICATION PROFILES FOR ODA (Q.26)

The rapporteur for Q.26 is R. Hunter, British Telecom. DAPs that conform to the PAGODA (Profile AlignmentGroup on ODA) levels 11 and 26 were incorporated in revised Rec. T.502 Processable Mode 11 (TD-362), and newRec. T.505, Processable Mode 26 (TD-361). Resolution 2 procedures were applied, without objections, in the SGplenary. New Rec. T.506, Processable Mode 36 was proposed for adoption at the March, 1991 meeting. The draftwill be submitted as a white document by October 12. These DAPs will eventually become ISO FODs (OpenDocument Formats, equivalent to International Standard Profiles - ISPs).

DTAM (Q.27)

The DTAM Recommendations were revised to become RTSE-based. They will now be aligned with MHS-88 anduse the same protocol stack, making interworking easier and providing for economy in implementation. It was alsodecided to accelerate work on DTAM protocols for interactive use with ODA in multimedia, remote editing, andteleconferencing applications and services. The revised drafts of Rec. T.431 (DTAM Introduction and GeneralPrinciples), Rec. T.432 (DTAM Services Specification) and Rec. T.433 (DTAM Protocol Specification) are in TD-403 .

MULTIMEDIA (Q.9)

The rapporteur for Multimedia, Audiovisual Interactive Systems (AVIS), is B. Marti, France Télécom. The meetingwas held jointly with the SC2 MHEG (Multimedia Hypermedia Experts Group). It was decided that some of thework could be completed with MHEG, but that communications aspects and interactive scriptware would be done byCCITT. Several contributions pointed out that ODA should be used for multimedia, but a liaison statement to theJTC 1 Ad Hoc Group on Multimedia/Hypermedia work assignment pointed only to SC 2. This conflicted with aliaison which originated in Q.27 (ODA), and a merged liaison was worked out by the rapporteurs, which stated thatarchitectural work should be done in SC 18 and coding work in SC 2 (TD-376rev).



ISDN TERMINALS (Q.17)

The rapporteur for this question is M. Matsumoto, NTT. The subject matter is the interface of Telematic terminalsto the ISDN, described in Rec. T.90. TD-427 is the latest draft. A US contribution (D-138) led to discussion onsetting parameter value defaults to minimize the effects of satellite delay. The default values will be retained aswindow size = 2 and packet size = 128 at layer 3; the default values for extended packet sequence numbering shall bewindow size = 80 and packet size = 128. There will be an inter Study Group meeting on satellite transmissioneffects in Geneva, November 7-9, 1990, under the chairmanship of I. Knight (COMSAT). The French and Japanesecontributions on concatenating layers (D-154 , D-187) use the "User Data Field" in XID to transfer commandsbetween Telematic Terminals. A liaison was sent to SGVII, since many felt that this would violate OSI principles.There were also discussions on the use of LLC, and the use of OSI network services (NSAP addressing) in Telematicterminals. The text in TD-348 annex 2 was tentatively accepted. It is unlikely that Resolution 2 procedures onthe revision of T.90 will be used in this study period.

VIDEOTEX PROTOCOLS (Q.15)

A new version of T.101 (International Interworking for Videotex Services) was developed. It changes sections 5.6through 5.9 and adds Section 9 (TD-378).

D-124 forms the basis for a draft Recommendation T.102. This work is currently scheduled for approval in ETSI inearly 1991.

It was agreed to start work on three new recommendations for "medium speed videotex" utilizing the followingfacilities:• T.103 ISDN D-channel• T.104 PSTN• T.105 ISDN B-channel packet mode

The following draft recommendations were also developed at the meeting:• Rec. T.541 - Videotex interworking Operational Profile (TD-292)• Rec. T.xxx - Photographic Videotex Data Syntax (TD-297)• Rec. T.504 - Videotex interworking Document Application Profile (TD-298)

Herman R. Silbiger, APPLICOM Application and Communication Consultants

ROSTER OF CCITT STUDY GROUP VIII, SEPTEMBER 4-14, 1990, GENEVA, SWITZERLAND

The meeting was attended by a total of 163 delegates (as shown in TD-324 and TD-341):

US - 14France - 20Japan - 20FR Germany - 17Italy - 7UK - 9Switzerland - 6ISO Delegation - 22Others - 48



REPORT OF TR-41 TELEPHONE TERMINALSSEPTEMBER 10 - 14, 1990, ASHEVILLE, NC

All committees met except for TR-41.5 and TR-41.6. TR-41 is creating a new working group (TR-41.10) forinternational issues. J. Thurmer of ETSI sat in on many of the sessions to get a flavor of how the TIA performstheir standards activities. With the participation of the Canadian Standards Association (CSA) and CanadianDepartment of Communications people, it was an international meeting.

TR-41.1 PABX AND ISDN TERMINATING EQUIPMENT

G. Leedy (AT&T) is Chairman of TR-41.1.

TR-41.1.1 LOSS LEVEL GROUP REPORT

The Digital PBX Loss Plan Application Guide (PN-1994) has been submitted to EIA for publication. It is beingpublished as TSB-32.

Work on merging ISPBX Loss Plan (PN-1993) with 464A is underway. Coordination with T1Q1 is progressing.This work, which includes echo return loss, should be ready for pink ballot in March, 1990.

TR-41.1.2 PRIVATE NETWORKSYNCHRONIZATION

This subworking group is chaired by Ed Polanski, AT&T. The PN-2198 draft document (TR-41.1.2/90-07-008 ) was reviewed; minor modifications will be made. Editorial and technical comments were made by NorthernTelecom (TR-41.1.2/90-09-009) . All the comments were either withdrawn or accepted. As expected, the basedocument will go out for ballot. (Ed. note: The most current version of PN-2198 is TR-41.1.2/90-10-001 .)

ETSI COLLABORATION

J. Thurmer, Chairman of BT (Business Telecommunications) of ETSI and invited guest of TR-41.1, reported onETSI and distributed the following documents:

TR-41.1/90-09-019 , ETSI ISDN Basic rate user-network Interface Layer 1 (S & T interface)TR-41.1/90-09-020 , ETSI ISDN Primary rate user-network interface Layer 1TR-41.1/90-09-021 , ETSI Technical Subcommittee BT2 (Business Telecommunications Network Performance)

Report of Meeting May 11, 1990 Paris, France.

ETSI, chaired by British Telecom, consists of twelve technical committees. It balances each technical committeewith equal numbers of carriers and manufacturers. Membership is weighted by the size of the organization and thesize of the country. Therefore, ETSI is dominated by large French, English and German organizations. NetworkAspects, Business Telecommunications (BT), Signalling Protocols and Switching, Transmission and Multiplexing,Terminal Equipment, and Special Mobile Group (GSM) are the most interesting technical committees.

BT2 is the closest equivalent to TR-41.1 and the most active of the BT technical committees. Standards andrecommendations are developed at two levels: ETS (European Technical Standards) and NETS. The NETS aresubsets of ETS that are for world wide use, while ETS are for European use. ETS are recommendations for localcarriers; they are not required. NETS are requirements.

J. Thurmer will accept input from TR-41.1 and relate it to the appropriate sub-committee chairman. U.S. TR-41.1members will be invited to attend ETSI BT2 technical committee meetings.

TR-41.1/90-09-025 is a contribution from CSA (Canadian Standards Association) T512 Technical Committee,under project PN-2396 (revision and addendum to EIA/TIA 496A). It proposes additional requirements in EIA/TIA464A-1989 to support the inclusion of voice band data requirements. Minimum PBX electrical and performancerequirements for data as well as messages (description only, not including code or format) must indicate PBX,connection activity, or operation. K. Krechmer (ACTION Consulting) suggested, and the committee accepted, thatthey consider following the work in TR-30.4 (AT command set standard) as a basis to describe the logical interface.



TR-41.1/90-09-029 , from Northern Telecom, is a summary listing, including abstracts, of updates and addendato ANSI/EIA/TIA 464A-1989 as of September 13, 1990. NT plans to maintain this document. The Chairman alsomaintains a list of errata to 464A which he will contribute to a future version of -029.

TR-41.1 set up a telephone conference to provide input to T1Q1 on the amount of delay that would be allocated tocustomer premise. The proposal from T1Q1 had allocated only 2 ms for CPE delay. Subsequently TR-41 askedT1Q1 for approximately four ms. TR-41.1 expects to have a revised PBX standard ballot out in March. There is aPBX standard in Canada that is out for ballot; there have been negative ballots on the issue of port to port testing.

TR-41.3 TELEPHONE AND ISDN TERMINALS

This was a joint TIA/CSA meeting chaired by L. Baker, Reliance Comm/Tec.

E. Bonkowski (Sears) indicated via phone to the chairman that he is interested in seeing work progress on an ISDNTA specification that describes the interaction between an ISDN terminal with 2 line display and a system for thepurpose of catalog ordering.

TR-41.3/90-08-018 is the proposed project statement (PN-2436) for transmission requirements for ISDNtelephone sets operating in the 7 kHz wideband mode. It includes the proposed (PN-2431) addendum to ANSI/EIA504A magnetic field intensity criteria for telephone set compatibility. FCC docket #87-124 is the proposed rule fortelephone magnetic field compatibility which bears on this issue.

Minor comments are being resolved on ballots for SP-1920A Digital/Acoustic Transfer Characteristics for ISDNTerminals . L. Baker presented some editing changes to SP-1920A that had been dropped from the latest draft. Thisstandard should be completed by the end of 1990.

There is concern that the work progressing in T1E1 that relates to CPE is not progressing in concert with TR-41.3.This issue will be raised at the plenary.

TR-41.3/90-09-019 is a report on the work in ISO/IEC JTC/SC18/WG9 describing the placement of alphabeticcharacters on a 10 key numeric keypad. Banking requirements (via ATMs) and voice messaging need to implementthe full alphabet. The locations of characters Q and Z are not currently defined. Proposed locations include Q and Zon numeric 1, Q on 7 and Z on 9 (alphabetic order). It was noted that some systems for the deaf place Q and Z onnumeric 1.

K. Krechmer (ACTION Consulting) noted the COM/APPLI work in Europe on the development of ApplicationsProgramming Interfaces (APIs). L. Baker indicated that this work may apply to a currently inactive project in TR-41.3 (PN-1915).

G. Leedy (AT&T) noted that J. Thurmer of ETSI indicated that an agreement was reached in July: ETSI will attemptto work more closely with U.S. standards organizations.

TR-41.4 NETWORK CIRCUIT TERMINATING EQUIPMENT STANDARDS

This group is chaired by Paul Madren of IBM. TR-41.4/90-09-021 was the results on the PN-2023 green ballot.There were zero "No" votes, and only five "Yes" votes with comments. The comments were either editorial orresolved. PN-2023 is trying to standardize on a V.35 interface with the following dilemma: although V.35 is a defacto standard, it is not supported by CCITT. IBM's contribution, TR-41.4/90-09-019 , raises this issue andrequests a re-write of Section 8 of the PSDS standard.

F. Breem (Bellcore) did a thorough investigation on the calculations used for the "equivalent frequency domainconstraint" (TR-41.4/90-09-023). The contribution analyzes the source of these numbers from various Bellcoredocuments, AT&T documents, and T1E1 documents, then provides input for the committee regarding the optimumspecification. The committee decided on 1.69 volts for a closed circuit and 3.38 volts for an open circuit. (Ed. note:Subsequent to the meeting at TR-41, T1E1.4 challenged these numbers.)



The committee is going to revise TIA 547. W. Buckley of Verilink, the editor, presented TR-41.4/90-06-008R1 , Addendum to TIA 547. The committee made several changes. The project on ESF datalink access to theNCTE registers will be re-written to become a new section in a revised TIA 547, the 1.544 Megabit NCTE standard.The document currently does not reflect work in T1M1.3 in terms of definitions and parameters.

TR-41.4/90-09-020 , from NTI, suggests further changes to TIA 547. They were accepted for inclusion in thenext revision of the 1.544 NCTE document. TR-41.4/90-09-022 , submitted by Verilink, points out the errorsin the figures and the lack of the adequate definition of LOS in TIA 547.

TR-41.7 ENVIRONMENTAL AND SAFETY CONSIDERATIONS

TR-41.7 recently completed work on a new EIA/TIA Standard 571, Environmental Considerations for TelephoneTerminal Equipment.

TR-41.7.1 prepared a comprehensive document: TR-41.7/90-09-026 , "Safety of Telephone Equipment." It is anintegration of IEC 950 and UL 1459. Several hand corrections were made over two days by TR-41.7.1, chaired byF. McCaughey. TR-41.7/90-09-026 is a guideline for UL 1459 and also for IEC 950. It is not a mandatorystandard, but will be published as guidance for manufacturers seeking compliance in the diverse markets of Europeand America. It includes an excellent and comprehensive treatment of the conflicts and inconsistencies between thedifferent safety standards.

TR-41.7/90-09-021 , presented by C. Tenorio of AT&T, concerns TR-41.7/90-09-026 . It proposes to reducethe testing with proven components such as a fuse or other current-limiting devices to reduce the number of samplesrequired for safety compliance. TR-41.7/90-09-027 , from B. Littlefield of Redcom Labs, provides a list of UL1459 deletions and deviations that were used as input to TR-41.7/90-09-026 . TR-41.7/90-09-028 and TR-41.7/90-09-030 propose to update IEC 950 to include new methods of measurement and definition of touchcurrent and protective conductor current.

TR-41.7/90-09-031 , a status report from R. Ivans to F. McCaughey on UL 1459. UL bulletins on May 31,July 10, and July 11 change UL 1459. Manufacturers must comply with the new UL 1459 revision 2 by theeffective date of October 1, 1990.

TR-41.7/90-09-019 , SP 1361, Environmental Considerations for Telephone Terminals, was circulated.

TR-41.7/90-09-022 , from V. Boersma, is a CISPR to classify large PBX systems as domestic equipment. ThisIEC proposal would have a negative impact on getting PBXs to comply with more stringent safety standards in theinternational environment.

TR-41.7/90-09-024 is an IEC paper requesting comments by November 1. It deals with ELV (Extra lowvoltage) limits with regard to protection against electrical shock. The committee was concerned about redefining"low voltage."

TR-41.7/90-09-029 is a report of US Advisory Group for IEC/TC 74 Working Group 7. It requests thatcomments be given to D. George of Unisys in regard to interface leakage current and restrictive access areas relatedprimarily to ISDN equipment configurations.

TR-41.7/90-09-023 is output from an Ad Hoc committee that looked at enclosures and their evaluation criteria(i.e., how enclosures are evaluated from a safety standpoint). Included are the committee's report and some charts asto what safety parameters would be applicable to an enclosure that would hold telecommunications equipment.

TR-41.7/90-09-032 lists standards from T1Y1.4 on various safety issues in T1Y1.

TR-41.7/90-09-033 is a CCITT liaison report from SGV highlighting those documents in SGV that areimportant to telecommunications safety issues. They include ESD immunity levels and RFI emanations.

TR-41.7/90-09-034 , a Cenelec document from V. Boersma, discusses the electromagnetic interference issues andraises the issue of a new standard for equipments' immunity to electromagnetic radiations.



TR-41.7/90-09-020 , from NTI, addresses the issues of speakers installed in air handling plenums including ULrequirements in regard to NFPA standards.

TR-41.7/90-09-035 is an NFPA standards action bulletin. Tentative Interim Amendments (TIAs), numbers 320,321, and 322 deal with proposals to change the NEC to clarify that it accommodates the reinstallation of oldequipment and makes an exception for test equipment. TR-41.7/90-09-035 clarifies listing requirements.

TR-41.7.2 BONDING AND GROUNDING

Grounding and Bonding Requirements for Telecommunications in Commercial Buildings (PN-2327 , Draft 5,September, 1990) was distributed. This work supports the integration of telecommunications equipment groundinginto general electrical grounding requirements.

The National Electrical Code (NEC) of 1990 addresses inspection of telecommunications equipment grounding forthe first time. Grounding has two major functions: safety and minimization of electrical noise. These functions canbe at cross purposes. Safety considerations, clearly the most important requirement, support a single buildingground concept as opposed to separate telecommunications and electrical ground systems that are connected at asingle point.

An additional ad hoc editing meeting is planned for October 22 and 23, 1990, in Watertown, WI to continue work onSP-2327.

TR-41.8 WIRING STANDARDS

WG-TR-41.8.1, Commercial and Industrial Building Wiring Standards, met to review SP-1907B , the second ballotrevision of Commercial Building Telecommunications Wiring Standard. This standard supports 4 wiring types:

1. 100 ohm unshielded twisted pair (8 position modular jack)2. 150 ohm shielded twisted pair (ref 802.5 hermaphroditic connector)3. 50 ohm coaxial cable (IEEE 802.3-1989 BNC connector)4. 62.5/125 micrometer optical fiber cable (not specified)

SP-1907B describes wiring organization and cable configurations (tree, bus and ring), and defines minimum outletrequirements (4 pair UTP plus at least one additional media connector).

SP-1907B and the related Residential Standard (EIA/TIA-570, still in ballot process) have attracted considerableinterest from a broad range of organizations. Because of the diversity of markets, interests, and technology (e.g.,construction, transmission, safety), the development of common understanding and terminology is slow. Manyediting changes continue. In order to expedite the process, SP-1907B will be submitted to ANSI with somechanges (but without a revised Chapter 12) to determine if the changes can be considered "editorial." If this is notpossible, the changed document--including a new Chapter 12--will be resubmitted for ballot as quickly as possible.

TR-41.8.2, Residential and Light Commercial Building Wiring Standard, (Chair, G. Lawrence, AMP) met andreviewed the ballot comments on SP-1558A. When completed, this project will become EIA/TIA-570.

TR-41.9 REGULATORY CONSIDERATIONS

TR-41.9 recently completed SP-1925 ,The Part 68 Measurement Guide. It is published as TelecommunicationsStandards Bulletin (TSB) 31.

The latest FCC Part 68 Instructions 730 are September, 1990, Number 225. These instructions now indicate thatdata equipment requires definition of the RJ jack associated with the equipment.

A project was approved to prepare a document to harmonize FCC Part 68 with CSO 3 (TR-41.9/90-09-027). Aphased program has been established by C. Berestecky. The digital section will be done at a later date. It will takeapproximately two years to prepare the document. TR-41.9/90-09-028 from Bell Canada is a cross referencefrom Part 68 to CSO 3; TR-41.9/90-09-029 is a reversed cross reference (from CSO3 to Part 68).



Although the project was not approved until the plenary, work started on the harmonization on the Canadian and US"HARMS" requirements. TR-41.9/90-09-030 requests a format for inputs for the harmonization effort. Thisformat, following a pattern established by F. McCaughey in TR-41.7, will put CS03 requirements on the left handside of a two column page and FCC Part 68 requirements on the right hand side, with harmonized requirements andrationale written in a one column format across the page.

TR-41.9/90-07-024 is a note to C. Berestecky and a letter to G. Date from W. Von Alvin on continuingcompliance with Part 68. TR-41.9/90-08-025 is a request from W. Von Alvin to C. Berestecky for input on theFCC form 730 regarding the format for the code and protection type. TR-41.9/90-08-026 is another letter to C.Berestecky from W. Von Alvin. It states that the facility interface codes have been improved for the S and Zoptions, which are the B8ZS and ZBTSI options for DS1 circuits.

TR-41.9/90-09-031 is an outline of the objectives and the plan that C. Berestecky established for creating asingle set of North American network protection requirements. TR-41.9/90-09-032 is a Gantt chart showingthat this work is going to be completed by July or August, 1992.

TR-41.9/90-09-033 is a report of the leakage current subcommittee. It discusses the ramifications of leakagecurrent not only as related to Part 68 but also to UL 1459, CSA 22.2 and CSO 3. TR-41.9/90-09-034 , from G.Schefler of BC Telephone, deals with ringer equivalence numbers on the Canadian CSO 3 issue 7 document. Itattempts to establish some equivalency for ringing equivalent numbers in the US versus the on-hook impedancerequirements in Canada.

TR-41.9/90-09-036 from C. Chamney of United Telecom comments on on-hook DC resistance and referenceimpedances. TR-41.9/90-09-037 , also from United Telecom, asks that the impedance requirements not bechanged and that there be some provisions for ringer silences features or accessories.

TR-41.9/90-09-038 , from United Telecom, discusses possible ways to avoid harm in cases of auto-redialing.Currently, FCC rules do not cover the operation of computer-controlled auto-redialing. There is active interestamong TR-41 committee members to develop rules covering auto-redialing as well as all types of auto-redialing.Active discussion on auto-redialing will commence at the next TR-41 meeting.

The following unnumbered documents were distributed:

• FCC Docket 90-133 : Hearing aid equipment requirements• FCC Docket 88-57 : Requiring all CPE equipment to be connected within 12 inches of the demarcation point• August 3, 1990 letter from P. Bennett, TIA, describing the TIA's request to stay FCC Docket 88- 57 (which

was denied)• FCC Docket 90-231 : Operator services problem• June 20, 1990 letter from P. Bennett to the User Premise Equipment Division in TR-41.9 discussing

Docket 88-57• ETSI NET 4 draft standard for attachment to the public switch telephone network.

Bill Buckley, Verilink, with Ken Krechmer, ACTION Consulting

The next issue of Communications Standards Reviewwill be published mid November, 1990.



TR 41 ROSTER, SEPTEMBER 10 - 14, 1990, ASHEVILLE, NC

Vic Boersma Northern Telecom (Chairman, TR-41)Gavin Leedy AT&T (Chairman, TR-41.1)LeRoy Baker Reliance Comm/TEC Systems (Chairman, TR-41.3)Paul Madren IBM, (Chairman, TR-41.4)T. Killam Siemens, (Chairman, TR-41.7)George Lawerence AMP, (Chairman, TR-41.8)C. L. Berestecky AT&T, (Chairman, TR-41.9)

ACTION Consulting Ken KrechmerAlberta Telephone Don CheesemanAmerican Express Jerry GentryAMP Ned SigmonAT&T Chuck BeresteckyAT&T C. David HaysAT&T Jim JamesAT&T Harry MildonianAT&T Ed PolanskiAT&T Newell RitchieAT&T Mark RussoAT&T Terry SchmalzriedAT&T Masood ShariffAT&T Don StewartAT&T Chuck TenorioAT&T Steve WhitesellAT&T Bell Labs Les BaxterBC Telephone George SchefflerBell Atlantic Trone BishopBell Canada Claude AllarsBell Canada Kris AndersonBell Canada Bannu HurtigBell Canada Frank McCaugheyBell Canada Anthony SkucasBellcore Fred BreemBellcore Jim BrunssenBellcore Rolyn CallahanBellcore Harold FerrellBellcore Eric HanssonBellcore Bob KoesterBellcore Joe OhlweilerBellcore Ron ProvostBellcore Jim StaatsBell Northern Andre BeaudetBellSouth Art DrottBellSouth Gary TennysonBerk-Tek Inc. David HessCCL Scott EarlCertelecom Labs D. W. DulmageCorning Steve SwansonCSA Ross CottonDept. of Commerce Joe HullDept. of Commerce Michael MeisterDigital Bryan GearingDS&G John CurtisDuPont Tony Fernandes

ETSI Jan Thurmer (INTUG)Fujitsu Jay FarrellGeneral Cable Greg NiemieraGen'l Services Richard HollingerGTE Charles MosgraveHubbell Ray AssayeshIBM Thomas ToherINC Fred WebberIsicad Inc. Paul KreagerKrone Al FeasterLeviton Mfg. Co. Clay StocklenMIS Labs Jim RomleinMiTel Robert HamiltonMiTel John NeedhamMobile Engr. Jon BipesMulvey & Banahi Bernard WongNTI Pierre AdornatoNTI Jorge Del RioNTI Sev GodoNTI Mel HackerNTI Erik HanssonNTI Syd HorneNTI Dermot KavanaghNTI Pierre LalondeNTI Dennis RittenhouseNTI John SchickNTI Scott ShawNTI Bao TranNTI - BNR Nick TulliusPulsecom Jack GehringRedcom Labs Bruce LittlefieldRhein Tech Labs Bert TiblinRolm John GageRolm Tom KillinRolm Tailey TungSiecor Tony BeamSiemens Dick FrankThe Siemon Co. John SiemonUL Randy IvansUS Air Force Spencer ReedUSDA Herb MendelsohnUnited Telecom Cliff ChamneyVerilink Bill BuckleyWiremold Chas. Whitney--- Wes Henry



1991 AND 1992 MEETING SCHEDULESSUBJECT TO CHANGE WITHOUT NOTICE

1991T1S1 Jan 7 Houston, TXT1Q1 Jan 20 ---TR-29 Feb 5 - 7 Southern Calif.T1E1 Feb 17 San Francisco, CATR-41 Feb 25 - Mar 1 Washington, DCT1S1 Mar 4 Raleigh, NCTR-41 Mar 4 - 8 Washington, DCSG VIII Mar 18 - 27 GenevaT1Q1 Apr 21 ---SG/WP XVII Apr 30 - May 8 GenevaT1S1 May 5 ---TR-29 May 7 - 9 Washington DC areaT1E1 May 12 Buffalo, NYSG/WP XVIII Jun 10 - 17 GenevaTR-41 Jun 17 - 21 Park City, UTT1Q1 Jul 7 ---TR-29 Aug 6 - 8 Yountville, CAT1S1 Aug 11 ---T1E1 Aug 25 Montreal, QueTR-41 Sep 2 - 6 Milwaukee, WIT1Q1 Sep 29 ---T1S1 Oct 13 ---WP VIII Oct 16 - 25 GenevaWP XVII Oct 29 - Nov 6 GenevaTR-29 Nov 5 - 7 ---WP XVIII Nov 11 - 22 GenevaTR-41 Dec 2 - 6 San Jose, CAT1E1 Dec 8 Williamsburg, VA

1992T1S1 Jan 19 T1Q1 May 17T1Q1 Feb 2 T1E1 Jul 19T1E1 Feb 16 T1S1 Aug 2T1S1 Mar 1 T1Q1 Aug 16SG VIII Apr 21-May 1 T1E1 Oct 25T1E1 Apr 26 T1S1 Nov 8T1S1 May 10 T1Q1 Nov 15



1990 MEETING SCHEDULES AS OF OCTOBER 5, 1990SUBJECT TO CHANGE WITHOUT NOTICE

T1Q1 Oct 15 - 19 Dallas, TXSG XVII Oct 15 - 23 GenevaT1S1 Oct 29 - Nov 2 Boca Raton, FLTR-29.2 Nov 5 Boca Raton, FLTR-29 Nov 6 - 8 Boca Raton, FLTR-45.3 Nov 6 - 8 Washington, DCCOMDEX Nov 12 - 16 Las Vegas, NV

TR-41 Nov 12 - 16 San Diego, CASG XVIII Nov 26 - Dec 7 GenevaTR-30 Dec 4 - 8 Clearwater Beach, FLT1E1 Dec 10 - 14 Washington, DCTR-45.3 Dec 11 - 13 Key West, FL

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