--r-·/i1,·_

f .

ANSt@T1.403-1989

American National Standardfor Telecommunications -

Carrier-to-Custo·mer Installation ­DS1 Metallic Interiace

Secretariat

Exchang~ Carriers Standards Association

Approved February 22, 1989

American National Standards Institute, Inc

Abstract

This standard provides the requirements for a metallic interface. referred to as thenetwork interface (NI). for a carrier-to-customer installation (Cl). Requirements includeelectrical characteristics, format parameters, and physical characteristics at the NI.This standard provides NI compatibility information and is not meant to be an

• equipment specification.

Working Group TIC1.2 on Digital Interfaces, which developed this standard,had the following participants:

William Buckley, ChairmanDon Bowey, Vice-ChairmanGene Mikulka, SecretaryLance Liptak, Editor

I

f

II~

~1

I1Jt~i

Jack AdamsA.l AkersDan AllenCharles A. AmatoJeff AndersonRich~derson

Charles AounRick Av ersandSassa,n BabaieHugh E. BaxterRobert L. BeebeDick BobBinVictor L. F. BoersmaGerry BoyerBob BridgeJim BurkittDa-r+d-.R. CairnsGuy CampbellLarry J. CarlJavier CarpioJack CaulderPet.er M. ChaseNorm Christiansen

Contents SECTION

Richard L. CochranJack CollinsDave CurtisJames DahlCliff DavidowPhilip L. DillonNell F. DonnellyJ. L. Eit.elD. A. EspositoReed K. EvenAbid FarooqL. A. FerraraEugene FinkelsteinPaul Fredet.teJames FuhrmanThomas A. GajeskiArmando GamberaW. E. GoodsonSteve GorsheMalcolm GriersonPeter GriffithsWilliam R. HamptonP. E. Hardy

Harvey HarrisJames C. HartC. F. Hayb ackJim HendersonEd HinelineHal HolzwarthYasuo IijimaJoseph D. JensenPhil JohnsonSal KarrLarry KeithMike KellyMike LefkowitzAusti n H. LeseaSteven L. LevineJohn Litst.erHowie LyhteWayne E. LohmanPaul L. MadrenKen MankeHarry MannTom MasonH. Matsuta

Frank McCaugheyDarrell McLeadBill MeNarnaraRick MelzigAI MillerSteve MinnemanRay MurbergerFredrick NaslundJohn NazzaroH. J. OestBob O'GradyRoger PandandaSubhash Pat.elKelvin PineroChuck PittmanEd PolanskyRon ProvostFarooq RazaDennis RittenhouseM. J. Roesch, JrBob ScariettRobert. S. SchwabKarl C. Shaver

Sam ShirianHann ShyuZ. A. SimieNeil Sip kesJonathan SmithEd SoltysiakStephen SotoJim Staat.sDouglas Sta.hlStan StotlerJoe St.urboisErv SymonsDave ThiedeAndrew TowelAndy TurnerEverett, TurveyJoe VecchioliBob WelbornPa.ul WilcockBeverly WinklerBernie WorneSteven A. WrightRobert T. Zader

PAGE

1. Scope............................................................................................................. 9

2. Referenced Standards and Publications.................................................... 92.1 American National Standards............................................................ 92.2 Other Standards 92.3 Referenced Publication 9

3. Definitions 9

4. General Information.................................................................................... 11

5. Electrical Specifications .5.1 General .5.2 Impedance Matching .5.3 Signal Specifications .5A Signal from g,..e Carrier (Carrier Signal) .5.5 Signal from the Customer Installation (C1 Sigaal) .5.6 Pulse Density .5.7 Jitter and Wander .5.8 Powering Arrangements .

111111111112121213

PAGE

1313 G)131313

13

1314141415

17

1819202121

22

2324

c) ..._0

2626c) ...-,28

282930

9. Connector Arrangements .

TablesTable 1 Superframe Format .Table 2 Extended Superframe Format .Table 3 Assigned Bit-Oriented ESF Data-Link Messages .Table 4 Bit-Oriented ESF Data-Link Message Functions .Table 5 Unassigned Bit-Oriented ESF Data-Link Codewords .Table 6 Example of Performance Report Messages for the DSI

Data Link .

FiguresFigure 1 Network Interface .Figure 2 Isolated Pulse Template and Corner Points .Figure 3 Pulse Amplitude Envelope with 50-Hz Longitudinal

Currents .Figure 4 Frequency Weighting Functions for Jitter Specifications .Figure 5 Channelized DSI Frame Bit Assignments .Figure 6 Performance Report Message Structure .Figure 7 Connector Pin Assignments (8-PositionjRJ48C) .Figure 8 Connector Pin Assignments (8-PositionjRJ48X with

Shorting Bars) .Figure 9 Connector Pin Assignments (5O-PositionfRJ48M) .Figure 10 Connector Pin Assignments (50 positionfRJ48H) .

Appendixes

Appendix A Cable Characteristics for Polyethylene InsulatedCable (PIC) and PULP 31

Appendix B Cable Characteristics for Metropolitan Area Trunk(1v1A..T) and Intercity Outst.at.e Trunk (IGOT) Cables 43

SECTION

6. Framing Formats .6.1 General .6.2 Frame .6.3 Superframe Format .6.4 Extended Superframe Format .

7. Clear Channel Capability .

8. Maintenance .8.1 Yellow Alarm .8.2 Alarm Indication Signal (AIS) .8.3 Loopbacks .8.4 ESF Data Link .

•

American National Standardfor Telecommunications -

Carrier-to-Customer InstallationOS1 Metallic Interface

1. Scope

This standard describes the metallic interfacebetween a carrier and customer installation (C1),referred to as the network interface (NI), at theDSl rate. It establishes requirements at the NInecessary for compatible operation between thecarrier and the C1. Interfaces such as carrier­to-carrier, PBX-to-PBX, PBX-to-computer, andPBX-to local area network are not covered inthis standard.NOTE: The user's attentiou is called to the possibility that.compliance with this standard ma.y require use of an inven­tion covered by patent rights.

By publica.tion of this st.a.ndard, no position is takenwith respect .to the validity of this claim or of a.ny patentrights in connection t.herewith. The patent holder has, how­ever, filed a. statement of willingness to grant a license underthese rights on reasonable and nondiscriminatory terms andconditions to applicants desiring to ob tain such a license.Details may be obtained from the publisher.

The requirements in this standard are forthe purpose of establishing a functional andpractical interface, and compliance with themprovides a satisfactory interface in a high per­centage of installations. If cases arise that havenot been adequately addressed in this standard,any resulting problems should be resolvedthrough the cooperation of the user, the carrier.and the equipment supplier.

The signals at the NI that are described inthis standard are of two types:

(1) Normal operating signals(2) Maintenance signals

Signals that appear as a result of theenvironment (e.g., induced voltages and currents,lightning hits, and like) are not covered.

This standard covers the 4-wire DSIinterface based on the various metallic digitalfacilities currently in use. Physical arrange­ments, electrical parameters, signal formats, andmaintenance protocols are described.

2. Referenced Standards and Publica­tions

2.1 American National Standards. Thisstandard is intended for use with the followingAmerican National Standards for Telecommuni­cations:

AJ."\TSI Tl.I01-1987, Synchronization InterfaceStandards for Digital Networks

ANSI T1.102-1987, Digital Hierarchy-ElectricalInterfaces

Al'TSI T1.107-1988, Digital Hierarchy-FormatsSpecifications

2.2 Other Standards. This standard is alsointended Ior use with CCITT, Red Book, FascicleVI, Recommendation q.921, ISDNUser-Network Interface Data Link Layer

. Specification.'

2.3 Referenced Publication

Code of Federal Regulations, Title 47, FCCRules and Regulations, Part 68 RevisedDecember, 1987.2

3. Definitions

alarm indication signal CArS). A signaltransmitted in lieu of the normal signal to main­tain transmission continuity and to indicate tothe receiving terminal that there is a transmis­sion fault located either at the transmitting ter­minal or upstream of the transmitting terminal.

l Available from the American National StandardsInscitute. 1430 Broadway. New York. NY, 10018.

2 Available from the U.S. Government Printing Office.Washington, DC 20402.

9

A.MERICAN NATIONAL STANDARD T1.403-1989

bipolar (alternate mark inversion) signal. Apseudoternary signal, conveying binary digits, inwhich successive "ones" (marks, pulses) are ofalternating, positive (+) and negative (-) polar­ity, equal in amplitude, and in which a "zero"(space, no pulse) is of zero amplitude.

bipolar violation. In a bipolar signal, a one(mark, pulse) which has the same polarity as itspredecessor.

B8ZS (bip9lar with 8-zero substitution). Acode in which eight consecutive o. zeros" arereplaced with the sequence 000+-0-+ if thepreceding pulse was +, and with the sequence000-+0+- if the preceding pulse was -, where+ represents a positive pulse, - represents anegative pulse, and 0 represents no pulse.

earrier. An organization that provides telecom­munications service to the public.

clear ehannel eapability. A characteristic of aDSI transmission path in which the 192 "infor­mation" bits in, a frame can represent any com­bination of zeros and ones.

cusnornez- installation (Cf}, Equipment andwiring at the customer's location on the custo­mer side of the NT.

cyclic redundancy check (CRC). A methodof checking the integrity of received data, wherethe check uses a polynomial algorithm based onthe content of the data.

DS1 (digital signal level 1). A digital signaltransmitted at the nominal rate of 1.544 Mbit /s.

in-band. Using or involving the informationdigit time slots of a DSl frame; i.e., bit assign­ments of a frame exclusive of the framing bit.

isolated pulse. A pulse free from the effects ofthe other pulses in the same signal. (A suitabletesting signal is a repetitive pattern of one "one"and seven "zeros.")

jitter. Short-term variation of the significantinstants of a. digital signal from their ideal posi­tions in time. Short-term implies that these vari­ations are high frequency (greater than 10 Hz).

10

line loopback. A loopback in which the signaltransmitted beyond the loopback point (the for­ward signal), when the loopback is activated, isthe same as the received signal at the loopbackpoint.

loopback. A state of a transmission facility inwhich the received signal is returned towards thesender.

network. A collection of transmission andswitching facilities used to establish communica­tion channels.

network interface (NI). The point of dernar­cation between the network and the CI.

payload. The 192 information bits of a DSlframe.

pulse density. A measure of the number ofIt ones" (marks, pulses) in relation to the totalnumber of digit time slots transmitted.

quasi-random signal (QRS). A signal consist­ing of a bit sequence that approximates a ran­dom signal.

regenerator. Equipment that reconstructs andretransmits a received pulse train.

terminal equipment. Equipment that ori­ginates or terminates signals at the specifiedrate.

Tl line. A full duplex digital transmission facil­ity that is composed of two twisted metallicpairs and regenerators that carry one-DS'l sig- .nal.

unit interval. The nominal difference in timebetween consecutive significant instants of anisochronous signal.

wander. Long-term variations of the significantinstants of a digital signal from their ideal posi­tions in time. Long-term implies that these vari­ations are low frequency (less than 10 Hz).

ZBTSI (zero-byte time slot interchange). Atechnique used on a DSI signal to ensure thatpulse density requirements are met, where zerooctets are replaced by an address chain which isdecoded by the receiving terminal, •

•

4. General Information

This standard provides NT compatibility require­ments and is not an equipment specification.The NI information in this standard comple­ments the equipment information in Part 68,Subpart D, of the FCC Rules and Regulations­which contains requirements for the registrationof customer-installation equipment to protect thenetwork from harm. Tariffs, contracts, or regu­latory acts in various jurisdictions may containmore stringent, requirements than those in thisstandard.

The physical connection of customer­provided equipment is accomplished by means ofjacks and plugs described in Part 68, Subpart F,of the FCC Rules and Regulations, supplementedby Public Notice 2526 (February, 1986).

Codeword and bit assignments, includingthose designated as reserved, shall be changedonly by the formulating committee of this stan­dard.

5. Electrical Specifications

5.1 General. These electrical specificationsdescribe the DSI signals delivered to the carrierand to the customer installation (C1) at the net­work interface (NI). A sketch of the NI is shownin Figure 1. The signal delivered to the N1 bythe carrier is identified as the carrier signal, andthe signal delivered by the 01 is identified as the01 signal. At the NI, some of the electricalrequirements for the carrier signal differ fromcorresponding requirements for the or signal,

5.2 Impedance Matching. Exchange cablesgenerally used by the carriers in the loop plantare nonloaded, staggered-twist paired cables.The characteristic impedance of these cablepairs and the impedance of associated termina­tions, a.t 772 kHz, is nominally 100 ohms."

:; See 2.3, Referenced Publlcation, for more information.

-i Appendix A contains characteristies of lOo-ohm cables.Embedded in the caeriera' plant. is a small amount. of low­capacitance type cables. The characteristic impedance of'these cables a.t 772 kHz ranges from 120 to 145 ohms (seeAppendix B). These cables are not. standard for thisinterface and if used will be handled on an individual basisto ensure that impedance discontinuities do not result ininterface reflections great enough to affect performance.

AMERICAN NATIONAL STANDARD TIA03-19gQ

5.3 Signal Specifications. The following sig­nal specifications describe characteristics for allsignals at the NT. Differences between the car­rier and the cr signals are identified in 5.4 and5.5.

5.3.1 Transmission Rate. The transmis­sion rate of the DSI signal shall be 1.544 Nfbit/s== 50 bit/so Older equipment may have ratevariations up to ± 200 bit/so

5.3.2 Line Codes. The line code for theDSI signal shall be bipolar, except where inten­tional bipolar violations are introduced by B8ZS.

5.3.3 Test Load. A termination of 100ohms ± 5% resistive shall be used at the NT forthe evaluation of signal characteristics.

5.3.4 Standard Pulse Characteristics5.3.4.1 Pulse Shape. An isolated pulse,

both positive and inverted negative, shall havean amplitude between 2.4 and 3.5 volts, meas­ured at the center of the pulse, and fit thenormalized template shown in Figure 2 whenscaled by a constant factor. Figure 2 alsodefines the corner points of the pulse template.

5.3.4.2 Power Levels. For an 3011­"ones" transmitted pattern, the power in a 2- to3-kHz band centered at 772 kHz shall be in therange of 12.0 to 19.0 dBm, and the power in a 2­to 3-kHz band centered at 1544 kHz shall be atleast 25 dB less.

5.3.4.3 Pulse Irnba.lance, In any win­dow of 17 consecutive bits, the maximum varia­tion in pulse amplitudes shall be less than 200mY, and the maximum variation in pulse widths(half amplitude) shall be less than 20 ns.

5.3.4.4 aD-Hz Variations in PulseAmplitude. Pulse amplitude may vary at a6o-Hz rate as a result of the presence of 50-Hzlongitudinal currents in the powering loops of Tlline regenerators. In such cases, the envelope ofpulse amplitudes shall be limited as shown inFigure 3. Any pulse amplitude in the range of2.4 to 3.45 volts may be used as the 100% pointin Figure 3.

5.4 Signal from the Carrier (Carrier Sig­nal). The carrier signal at the NI shall meet thesignal specifications of 5.3 except that:

(1) The pulse characteristics shall be thoseof a standard pulse, as described in 5.3.4,transmitted through a cable pair with a loss inthe range of 0.0 to 16.5 dB at 772 kHz betweenlaO-ohm terminations, and

(2) The lower limit on the standard pulseamplitude shall be 2.25 volts rather than 2.4volts.

11

A~fERICAN NATIONAL STANDARD TIA03-19g9

The variable length and characteristics ofinstalled cable pairs make it; impractical todefine a pulse template for the carrier signal atthe N1. However, the standard pulse templatemay be used with the appropriate mathematicalprocedures to construct representative hypotheti­cal signals for design purposes based on approxi­mate electrical characteristics of IOo-ohm cablesas shown in Appendix A.s

5.5 Signal frorn the Customer Installation(CI Signal). The CI shall not apply voltages tothe NI other than those described in this stan­dard. The CI signal at the 041 shall meet thespecifications of 5.3 except that:

(1) The pulse characteristics shall be thoseof a standard pulse as described in 5.3.4.

(2) The lower limit on the pulse amplitudeshall be 2.0 volts.

NOTE: This allows a nominal l.5-dB attenuation at 772

kHz in the CI wiring.

5.8 Pulse Density. Except for the quasi­random signal (see Note), a DSI signal at the NIshall meet the following constraints:

(1) No more than 15 consecutive "zeros"(2) At least N "ones" in each and every

time window of 8 (lV+1) digit time slots (whereN can equalI through 23).

In the case of channelization by the net­work, and when clear-channel coding is not pro­vided, the contents of an all zero, eight-bittime-slot, as described in 6.2, may be changed.

The quasi-random signal may be transmit­ted without meeting these pulse density require­ments.

NOTE: The quasi-random signal is a 1,04g,575-bit sequencegenerated by a ~o-stage shift register with feedback takenfrom the 17th and 20th stages. The output signal is takenfrom the 20th. stage, and an output bit is forced to be a"one" whenever the next 14 bits are all "zero." The QRS isused for maintenance and other purposes.

The quasi-random sequence satisfies the following:

Q"+l(k + I} ~ Q,,(k},n..... 1,2, .... ,19,

5 A small amount of low-capacitance cables still exist in thenetwork. Approximate electrical characteristics for thistype of cable are shown in Appendix B.

e The current jitter allocation is under study. The jitterspecification shown is the maximum source-to-sinkrequirement and is the maximum allowed at any interface.When the allocation process is complete, each interface willreceive an allocation lower than the a.bove figure so tha.t thetotal source-to-sink jitter does not exceed the above figure.

12

where:

Q,,(k) = Present state for nth stageQ,,(k+ 1) = Next state for nth stage

RD{k) = Present value of output+ = a logic OR operation

@ = a. logic EXCLUSIVE OR(modulo-two-addition) operation

) = a logic NEGATION operation

CIs transmitting the QRS to the NI should transmit theQRS in the 1.535-Mbit/s payload; the carrrer may transmit

the QRS either framed or unfr arned to the NI.

5.7 Jitter and Wander. The following is aprovisional specification on jitter and wander,which is currently under study.

5.7.1 General. Jitter is short-term varia­tions of the significant instants of a digital signalfrom their ideal positions in time; wander islong-term variations of the same instants. Theterm! jitter, generally applies to variation abovea frequency of 10 Hz. Wander is a long-termphenomenon with time constants ofhours/minutes. The magnitudes of jitter andwander are specified in terms of unit intervals(DIs). One UI is equal to 648 ns.

5.1.2 Jitter. Jitter is specified in two fre­quency bands: band 1 and band 2, whosecharacteristic weighting functions are providedin Figure 4.

5.7.3 Wander. Wander is classified aslong term (24 hours) and short term (15minutes), and the following specifications applywhen measured against a primary referencesource (PRS), as defined in Al"lSI T1.101-1987.

5.7.4 Carrier Signal Jitter.6 At the NI,the jitter of the carrier signal. shall not exceedthe following limits, in both bands simultane­ously:

Band 1: 5.0 UIs, peak-to-peakBand 2: D.1'VIs, peak-to-peak5.7.5 Carrier Signal Wander. At the

NT, the wander of the carrier signal shall notexceed 28 DIs, peak-to-peak, over any 24:-hourperiod; nor shall it exceed 5 DIs, peak-to-peak, inany IS-minute interval.

5.7.8 CI Signal Jitter. Ali the NI, thejitter of the CI signal shall fall into one of twocategories:

Type 1. Where the equipment on the CI sideof the interface is the source, i.e., terminal equip­ment ,

Type II. Where the CI source is part of auser network and is transported over a user'sfacility to the interface. •

At the NI, the jitter of the C1 signal shallnot exceed the following in both bands simul­taneously:

Type IBand 1: 0.5 UIs, peak-to-peakBand 2: 0.01 UIs, peak-to-peak

Typ~ II 6

Band 1: 5.0 UIs, peak-to-peakBand 2: 0.1 Uls, peak-co-peak5.7.7 CI Signal Wander. At the NI, the

wander of the C1 signal shall not exceed 28 DIs,peak-to-peak, over any 24-hour period; nor shallit exceed 5 UIs, peak-co-peak. in any I5-minuteinterval.

5.8 Powering Arrangem.ents. Direct-currentpower shall not be delivered to the NI.

6. Framing Formats

6.1 General. The carrier and the cr signal atthe N1 shall be framed in either the superframe(SF) format or .the extended superframe (ESF)format. The same framing format shall be usedin both directions of transmission.

6.2 F'r-arne; A frame is a set of 192­information-digit time-slots preceded by onedigit time-slot containing the framing (F) bit, fora total of 193 digit time-slots. The 192-informa­tion-digit time-slots may be partitioned into 24eight-bit time-slots (see Figure 5).

6.3 Superframe Form.at. A superframe con­sists of twelve consecutive frames. The SF for­mat is a structure in which the F bits are usedfor framing only. In the SF format, the F bitsare divided into two groups (see Table 1):

(l) Terminal Framing (F~) bits, used toidentify frame boundaries

(2) Signaling Framing (Fs ) bits, used toidentify superframe boundaries. (When the 192­digit time-slots are channelized, the F s bits areused to identify the Robbed-Bit signaling framesand associated signaling channels A and B.)

6.4 Extended Superfram.e Format. Anextended superframe consists of twenty-four con­secutive frames. The ESF format is a structurein which the F bits are used as follows and asshown in Ta.ble 2:

(1) A 2-kbit/s framing pattern sequence(FPS) to identify the frame and the extendedsuperframe boundaries. (When the 192-

A1vfERICAl"i NATIONAL STANDARD TIA03-19g9

information-digit time-slots are channelized, theFPS bits are used to identify the Robbed-Bit sig­naling frames and associated signaling channels.)

(2) A -!-kbit/s data link (DL). When idle,the DL shall contain continuous repetitions ofthe data link idle code 01111110. (See also8A.l.)

(3) A 2-kbit/s cyclic redundancy check(eRC) channel, which carries the CRC-6 code.The CRC-6 bits transmitted in ESF (N+l) shallbe determined as follows:

(a) For the purpose of CRC-G calcula­tion only, every F bit is set to "one" in ESF(..IV);i.e., the ESF just preceding ESF (lV+l). ESFUv)is altered in no other way.

(b) The resulting 4632 bits of ESFU"Jare used, in order of occurrence, to construct apolynomial in .X such that bit 0 of ESF(lV) is thecoefficient of the term ...\'1631 and bit 4631 ofESF(1V) is the coefficient of the term XC.

(c) The polynomial is multiplied by thefactor x: and the result is divided, modulo 2, bythe generator polynomial ...YtJ + ...Y + 1. Thecoefficients of the remainder polynomial areused, in order of occurrence, as the ordered set ofcheck bits, C1 through C6, for ESF(N+l). Theordering is such that the coefficient of the termXS in the remainder polynomial is check bit Cland the coefficient of the term ...Y? in theremainder polynomial is check bit C5.

(d) The check bits, Cl through C5,contained in an ESF shall always be those asso­ciated with the content of the ESF immediatelypreceding. When there is no immediatelypreceding ESF, the check bits may be assignedany value.

7. Clear Channel Capability

To provide clear channel capability (CeO), aDSI signal with unconstrained information bitsis altered by some method to meet the pulse den­sity requirements of 5.5. The method used toprovide eee shall be the same in both directionsof transmission. The long-term method for pro­viding cee is B8ZS. ZBTSI is one alternateinterim method for providing CCC.

8. Maintenance

Maintenance signals are transmitted in-band in

13

AMERICAN NATIONAL STANDARD 'flA03-19g9

the SF format' and in the data link of the ESFformat.

8.1 Yellow .Alar-rrr, A Yellow Alarm signalshall be transmitted in the outgoing directionwhen a DSl terminal determines that it haseffectively lost the incoming signal. A YellowAlarm signal shall be transmitted to the inter­face in the following forms:

(1) Superframe Format.8 For the duration ofthe alarm condition, but for at least 1 secondbit 2 in every eight-bit time-slot shall be a '"zero."

(2) Extended Superframe Format. For theduration of the alarm condition, but for at leastone second, a repeating 16-bit pattern consistingof eight "ones" followed by eight "zeros" shall betransmitted continuously on the ESF data link,but may be interrupted for a period not toexceed lOD-IDS by one or more fault isolationmessages. After an interruption, one of the fol­lowing fault-indicating conditions shall appearat the interface in the same direction oftransmission as the original Yellow Alarm:

(a ) Yellow Alarm(b) A1S(c) Loss of signal

(3) Both Formats. For either framing for­mat, the minimum time between the end of onetransmission and the beginning of anothertransmission shall be 1 second. Certain servicesprovided by the network may require longer timeintervals than these minimum values, or mayrequire unequal "on" and "off" intervals, or both.

8.2 Alarm Indication Signal (AIS). An AISshould be transmitted to the NI upon a loss oforiginating signal, or when any action is takenthat would cause a signal disruption. The AISshall be removed when the condition triggeringthe AIS is terminated. The AlS shall be anunframed, all-l'ones" signal.

8.3 Loopbacks, Loopbacks are used by car­riers and users as a maintenance tool to aid in

7 In the SF format. only. t he following framed codes may beused within the network to support out-of-servicemaintenance and prot.ectiou switch operations. These codesare used in repetitive pulse patterns of more ~han 5 seconds.Network equipment may block customer transmission oflong sequences of these pat.t.er ns:

11000 (~ in 5)11100 (3 in 5)10100

8 It is recognized that. some existing unchannelizedequipment does not transmit Yellow Alarm.

14

problem resolution. The codes and protocolsdescribed in this subsection may be used by thecarrier for section testing or by the user for CI­to-Cr testing.

8.3.1 Line Loopbacks8.3.1.1 Line Loopback Using the SF

Format. The protocol currently in use by thecarriers for network access to the CI line loop­back feature is in-band signaling control. Onlythe CI may respond to the in-band control lineloop back codes described here.

With in-band signaling control, the lineloopback shall operate upon receipt of specificframed pulse patterns. The line loopback pulsecodes and functions are:

(1) Activate. A framed DS1 signal consist­ing of repetitions of four "zeros" followed by one"one", lasting for at least 5 seconds, with theframing bits overwriting the pattern.

(2) Deactivate. A framed DSI signal con­sisting of repetitions of two "zeros" followed byone "one", lasting for at least 5 seconds, with theframing bits overwriting the pattern."

The line lcopback shall also operate uponreceipt of the patterns in land 2 above withoutframing to accommodate embedded equipmentthat sends unframed (nonstandard) control sig­nals. With the CI line loopback featureactivated, the customer's signal is interruptedand the DSI signal received from the network istransmitted back to the network. The loopedsignal shall be regenerated by the C1withoutchange in framing format or removal of bipolarviolations.

8.3.1.2 Line Loopback Using the ESFForm.at. Access to the line loopback feature inthe ESF format is by means of the ESF data-linkmessages, shown in Table 3. 10

8.3.2 Payload Loopback, Payload loop­back is supported only by the ESF format.When a payload loopback is activated, thereceived information bits (192 information bitsper frame) are transmitted in the outgoing direc­tion. The framing bits (frame synchronization,CRC-5, and DL) are originated at the point ofthe payload loopback. The payload loopback

Q Embedded rietwcrk equipment. exists which may react tothe line loop back deactivate code and block the code fromreaching the CI, requiring manual intervention Co deactivatethe line loop back.

10 Embedded NCTE equipment exists in that line LoopbackActivate and Deactivat.e are accomplished by eitber framedor unframed in-band codes as described in 8.3.1.1. •

•

•

ha ll rna int.ain bit-sequence integrityll for thes . kinformation bits; however, the paylo~d lo~pbac

need not maintain the integrity of eight-bittime-slots, frames, or superframes. Payloadloopback commands are described in 8.4.2.

8.4 ESF Data Link8.4.1 Introduction. This subsection

specifies the use of the, ESF da~a link (DL) forcarrying performance informacion and controlsignals across the NT. The specification of thesesignals is the same for both directions oftransmission.V

Performance information appearing in onedirection of transmission is a quantification ofthe quality of transmission in the opposite direc­tion.

Two signal formats are used on the DL:(1) Bit-oriented signals, repeated bit pat­

terns (codewords)(2) Message-oriented signals, messages using

a LAPD protocolThe bit-oriented signals carry priority mes­

sages, and command and response messages.The message-oriented signals carry performance­monitoring information. The structure of theinformation within the message-oriented protocolis bit-assigned. The monitored parameters are in8.4.3.1; the formats of the generated messagesare in 8.4.2.2 and 8.4.3.3.

Operation, administration, and maintenanceof the network may cause other messages toappear at the NI (the C1 should be able to disre­gard any such undefined messages). Use of theDL for other terminal-to-network communica­tions or for any terminal-to-terminal messagesbevond the described set is for future study.Network architecture is such that the DL maybe discontinuous relative to the DS1 payload andend-to-end continuity of the DL cannot beguaranteed.

8.4.2 Bit-Oriented Messages. Bit­oriented messages are preemptive. When sent,they overwrite other signals on the DL. Table 4lists two categories of bit-oriented messages

11 This requires tha~ the timing of the transmitted payloadloop back signal be synchronized with the timing of thereceived payload loop back signal.

12 Equipment exists that. USes the data link exclusively forYellow Alarm and an all-ones idle code. Such equipmentcannot t ake advantage of t.he svandard features described inSA. Thus, when such equipment is connected to equipmentthat meets the sp eeiflcat.ions of 8.4, performance informacionand control signals appear in one direction only.

..lJvfERICAN NATIONAL STANDARD TIA03-19S9

(priority, and command and response messages)and the specific functions associated wich each.

8.4.2.1 Functionality of Bit-OrientedMessages

8.4.2.1.1 Priority Messages.Priority messages indicate a service-affectingcondition. They shall be transmitted until thecondition no longer exists, but not for less than 1second. These messages may be interrupted fora maximum of 100 milliseconds per interruptionwith a minimum interval of 1 second betweeninterruptions.

8.4.2.1.2 Command andResponse Messages. Command and responsemessages are transmitted to perform variousfunctions. The loopback commands of Table 3activate and deactivate the line loopback andpayload loopback functions of the CI, asdescribed in 8.3. Command and response mes­saees that are labeled "Reserved for NetworkoUse" shall not be generated by the C1. The useof the network loopback and protection switch­ina' functions described in Tables 3 and 4 are notocovered by this standard. Command andresponse codewords shall be repeated at least 10times.

8.4.2.2 Format of Bit-Oriented Mes­sages. Data-link bit-oriented messages shall beof the format:

~o 11111111

with the rightmost bit transmitted first. Table 3lists two categories of bit-oriented message func­tions and their associated 16-bit codewords.Table 5 lists unassigned codewords. Codewordsfor priority messages shall be repeated continu­ally until the condition that initiated the mes­sage is removed. The minimum duration shall beas specified for Yellow Alarm in 8.1. Commandand response codewords shall be repeated atleast 10 times.

8.4.3 Message-Oriented Signals8.4.3.1 Transmission-Error Event.

Occurrences of transmission-error events indicatethe quality of transmission. The occurrencesthat shall be detected and reported are:

(1) No events

(:2) CRe error

(3) Severely errored framingThe occurrences that should be detected

and. if detected, shall be reported are:

(4) Frame-synchronization-bit error

15

A.M:ERICAN NATIONAL ST.A..NDARD Tl.403-HlSg

(5) Line-code violation(6) Controlled slip

These are defined in the following subsec­tions.

8.4.3.1.1 CRe Error Event. ACRC error event is the occurrence of a receivedeRe code that is not identical to thecorresponding locally calculated code.

8.4.3.1.2 Severely Errored Fram­ing Event. A severely errored framing event 13

is the occurrence of two or more framing-bit­pattern errors within a 3-ms period. Contiguous3-ms intervals shall be examined. The 3-msperiod may coincide with the ESF.

8.4.3.1.3 Frame-Synchroniza­tion-Bit Error Event. A frame-synchroniza­tion-bit error event is the occurrence of areceived framing-bit-pattern error.

8.4.3.1.4 Line-Code ViolationEvent. A line-code violation event for an Ai\11­coded signal is the occurrence of a received bipo­lar violation. A line-code violation event for aBSZS-coded signal is the occurrence of a receivedbipolar violation- that is not part of a zero­substitution code.

8.4.3.1.5 Controlled Slip Event.A controlled slip event is the occurrence of areplication. or deletion, of a DSl frame by thereceiving terminal. A controlled slip may occurwhen there is a difference between the timing ofa synchronous receiving terminal and the carriersignal.

8.4.3.2 Message-Oriented Perfor­mance Report. The carrier signal and the CIsignal shall include a performance report senteach second using a bit-assigned message struc­ture. The L-secoud timing may be derived fromthe DSI signal, or from a separate equally accu­rate (±32 ppm) source. The phase of the 1­second periods with respect to the occurrence oferror events is arbitrary; that is, the l-secondtiming does not depend on the time of occurrenceof any error event.

The performance report contains perfor­mance information for each of the four previous1 second intervals. This is illustrated in Figure6, octets 5 through 12. and by an example inTable 6.

13 On an interim basis to facilitate early implernenta.tion ofthis standard. use of existing "l of 4, 2 of 5, 3 of 5. etc.fra.ming error det eccion criteria. may be substituted for thiscriteria.

16

Counts of events shall be accumulated ineach contiguous I-second interval. At the end ofeach l-eecond interval, a modulo-a counter shallbe incremented, and the appropriateperformance bits shall be set in the to octets(octets 5 and 6 in Figure 6). These octets andthe octets that carry the performance bits of thepreceding three I-second intervals form the per­formance report.

8.4.3.3 Format of Message-OrientedPerformance Report. The carrier signal andthe C1 signal conforms to the Q.921jLAPD (level2) protocol to carry performance reports, asdescribed in CC1TT Recommendation Q.921.This application uses a subset of the fullQ.921/LAPD capabilities. The message struc­ture is shown in Figure 6 t where the followingabbreviations are used:

(1) SAPI: Service Access Point Identifier(2) CjR: Command/Response(3) EA: Extended Address(4) TEl: Terminal Endpoint Identifier(5) FCS: Frame Check Sequence

This message structure is that. of aQ.921/LAPD, unnumbered and unacknowledgedframe. The performance report shall use onlythe SAPI/TEI values shown in Figure 6.

The source of the performance report shallgenerate the frame check sequence (FCS) andthe zero stuffing required for transparency. Zerostuffing by a transmitter prevents the occurrenceof the flag pattern (01111110) in the bitsbetween the opening and closing flags of aQ.921jLAPD frame by inserting a zero after anysequence of five consecutive ones. (A receiverremoves a zero following five consecutive ones.)The data elements in the performance. report arearranged so that zero stuffing will never occur inthe information field, but zero stuffing may occurin the FCS. Thus, except for the FCS, the linesignal duplicates the list sequence of the report(octets 1 t hru 12, Figure 6), and the message isof constant length from the opening flag to theend of the information field. Throughput of thedata link may be reduced to less than 4 kbit/s insome cases. The performance report" is alwayspassed.

l4 The performance report with SAPI 14 should beconstructed and inserted on the data link by the sourceterminal that constructs the information payload of the DSIsignal whether it is a. network (CjR=l) or a. Cl (C/R=O)terminal, The performance report with SAPI 14 should bedelivered without alteration to t.he terminal t.ha.t sinks theinformation payload of the DSI signal.

,

•

8.4.4 Priority of Bit-Oriented Mes­sages. Bit-oriented messages shall preempt anyQ.921jL..A..PD messages.

8.4.5 Special Carrier Applications. Acarrier may require the use of the ESF data linkfor purposes related to the provisioning ormaintenance of the DSI facility or circuit.Examples of these applications are:

(1) Communicating performance informa­tion within the network

(2) Providing protection switching control(3) Providing clear channel capability.

10 Some necwor k providers and some customer installationshave the capability of using special applications for suchpurposes as dear channel capability. In such cases. bycommon agreement. these special applications may be usedat the NI, resulting in only 2 kbit/s of the data link beingavailable at t he NI for maintenance and performancepurposes. When special applications are present, theremaining capacity will be used as described in the previoussections. Bit-oriented messages will be transmitted withcomparable robustness. Some of these applications (such asZBTSI) are described in other American National Standards.

•

-t-·-'

AMERICAN NATIONAL STANDARD T1.403--19S9

Such uses may cause interruptions, delays,or reduction of throughput on the ESF data link,but. should not impact the timely transmission ofthe bit-oriented messages and of the performancerepon. 15

g. Connector Arrangements

Interconnection at the NI should be via one offour Universal Service Ordering Code (U80C)connectors (RJ48C, RJ48X. RJ48M, and RJ48H),as shown in Figures 7-10. The 8-pin connectorsin Figures 7 and 8 have the same pin assign­ments, but the connector in Figure 8 provides a.physical loop back when unplugged. The 50-pinconnectors in Figures 9 and 10 are physically thesame but have different pin assignments. Thepin assignments of Figure 10· allow for more cir­cuits.

17

A.t\1ERICAN NATIONAL STANDARD T1.403-19g9

Table 1Superframe Format

Bit Use In Each Signaling BitF Bits Time Slot Use Options

FrameNumber Bit Term Signal Tra.ffic Signal T Signaling

Number Frame Frame Channel(F\) (F:)

1 0 1 1-8

2 193 0 1-8

3 386 0 1-8

4 579 0 1-8

5 -.,.t) 1 1-8t t ..

6 965 1 1-7 8 A,

,., 1158 0 1-8,8 1351 1 1-8

9 1544 1 1-8

10 1737 1 1-8

11 1930 0 1-81') 2123 0 1-7 8 B......

NOTES(1) Frame 1 transmitted first.(2) Frames 6 a.nd 12 are denoted signaling Ir ames.(3) Option T- Traffic (bit 8 not used-for Robbed-Bit signaling).

18

_-....-------------_._--~-_._'-_.~--~~-_._-------~-~-- .._-----------------

A.MERICAL"i NATIONAL STANDARD T1.403-1989

Table 2Extended Superframe Form.at

Bit Use In Each Signaling BitF Bits Time Slot Use Options

FrameNumber Bit FPS DL CRC Traffic Signal T 2 4 16

Number

1 0 m 1-82 193 C1 1-83 386 m 1-84 519 0 1-85 ...... ') m 1-8J; ...

6 965 C2 1-7 8 A A A7 1158 m 1-88 1351 0 1-89 1544 m 1-8

10 1737 C3 1-811 1930 m 1-812 2123 1 1-7 8 A B B13 2316 m 1-814 2509 C4 1-815 2702 m 1-816 2895 0 1-S''''1 3088 m 1-8.1.1

18 3281 C5 1-7 8 A A C19 3474 m 1-820 3667 1 1-821 3860 m 1-822 4053 C6 1-823 4246 m 1-824 4439 1 1-7 8 A B D

NOTES:(1) Frame 1 transmitted first.(2) Frames 8, 12, 18, and 24 are denoted signaling frames.(3) FPS :II Framing Pattern Sequence (...001011...)(4) DL :II 4kbit/s Data. Link (Message Bits m)(5) CRC - CRC.6 Cyclic Redundancy Check (Bits C1-C6)(6) Option T =or Traffic (Bit 8 not used for Robbed-Bit signaling)(7) Option :2 - 2-State Signaling (Cha.nnel A)(8) Option 4 - 4-State Signaling (Channels A a.nd B)(9) Option 16 - 16-Sta.te Signaling (Channels A, B, C, and D)

19

M1ERICAN NATIONAL STANDARD TIA03-19S9

Ta.ble 3Assigned Bit-Oriented ESF Data-Link Messages

Function

Yellow AlarmReserved for network useReserved for network useReserved far network use

Priority Messages

Codeword

o 000000011111111o 001110 011111111o010110 011111111o011010 011111111

Comma.nd a.nd Response Messages

Line Loop back ActivateLine Loop back DeactivatePayload Loop back ActivatePayload Loop back Deactivat-eReserved for Network Use (Loopback Activate)Reserved for Network Use (Loop back Deactivate)Reserved for Protection Switch Line 1Reserved for Protection Switch Line 2Reserved for Protection Switch Line 3Reserved for Protection Switch Line 4

Reserved for Protection Switch Line 5Reserved for Protection Switch Line 6Reserved for Protection Switch Line 7Reserved for Protection Switch Line 8Reserved for Protection Switch Line 9Reserved for Protection Switch Line 10Reserved for Protection Switch Line 11Reserved for Protection Switch Line 12Reserved for Protection Switch Line 13Reserved for Protection Switch Line 14Reserved for Protection Switch Line ISReserved for Protection Switch Line 16Reserved for Protection Switch Line 17Reserved for Protection Switch Line 18Reserved for Protection Switch Line 19Reserved for Protection Switch Line ~o

Reserved for Protection Switch Line ~l

Reserved for Protection Switch Line :;2Reserved for Protection Switch Line :;3Reserved for Protection Switch Line :;4Reserved for Protection Switch Line :;5Reserved for Protection Switch Line :;6Reserved for Protection Switch Line '11Reserved for Protection Switch AcknowledgeReserved for Protection Switch ReleaseUnder St.udy for SynchronizationUnder Study for SynchrcniaavionUnder St.udy for SynchronizationUnder Study for SynchronizationReserved for network useReserved for network useReserved for network useReserved for network useReserved for network use

o OOOUI 011111111o 011100011111111o 001010 011111111o 011001 011111111o 001001 011111111o 010010 011111111o 100001 011111111o 100010011111111o 100011 011111111o 100100011111111o 100101 011111111o 100110011111111o 100111 011111111o 101000011111111o 101001 011111111o 101010011111111o 101011 011111111o 101100 011111111o 101101 011111111o 101110 011111111o 101111 011111111o 110000 011111111o 110001 011111111Q 110010 011111111o llOOll 011111111o 110100 011111111o 110101 011111111o 110110 011111111o 110111 011111111o 111000011111111o 111001 011111111o 111010 011111111o 111011 0111111110001100011111111o 010011 01111111100110000111111110000110011111111a 010001 0111111110010100 011111111o 001011 0111111110001101 0111111110001111 0111111110011101 0111111110010101 011111111

,

NOTES:(1) Rightmost bit transmitted first.(:;) The "Protection Switch Line" codes of the form 01.x:A..\....~0 11111111

use the ave X-bits to indicate the number of the line. 1 through '27,to be switched to a. protection line.

20 •

•

•

...\JvfERICAN NATIONAL STANDARD T1.403-19S9

Table 4Bit-Oriented ESF Data-Link Message Functions

Priority Messages

Yellow Alarm

Command and Response Messages

Line Loopback ActivateLine Loopback DeactivatePayload Loopback ActivatePayload Loopback DeactivateNetwork Loopback ActivateNetwork Loopback DeactivateProtection Switch Line z (1~~27)

Protection Switch AcknowledgeProtection Switch Release

Table 5Unassigned Bit-Oriented

ESF Data-LinkCodewords

o 011110 011111111o 000011 011111111o 000101 011111111o 111100 011111111o 010111 011111111o 000001 011111111o 000010 011111111o 000100 011111111o 001000 011111111o 010000 011111111o011011 011111111o 011111 011111111o 100000 011111111o 111101 011111111o 111110 011111111o 111111 011111111 (See Notes)

NOTES:(1) Right rnosc bit tra.nsmit.ted first,(2) Assignment. of this code should be

a.voided due to its similarity to theDL Idle Code. as described in 5.4(2)•

21

AMERICAN NATIONAL STANDARD T1.403-19g9

Table 6Example of Perform.ance Report Messages

for the DSI Data Link

I-to 1=-10+ 1 l-l o+2 1=IQ+ 3

Fla.g 01111110 01111110 01111110 01111110Address Octet 1 00111000 00111000 00111000 00111000Address Octet 2 00000001 00000001 00000001 00000001Control 00000011 00000011 00000011 00000011

Message Octet 1 00000001 00000000 10000000 00100000Message Octet 2 00000000 00000001 00000010 00000011

Message Octet 3 00000000 00000001 00000000 10000000Message Octet 4 00010011 00000000 00000001 00000010

Message Octet .') 00000000 00000000 00000001 00000000Message Octet 6 01000010 00010011 00000000 00000001

Message Octet i 00000010 00000000 00000000 00000001Message Octet 8 00000001 01000010 00010011 00000000

FCS Octet.! xxx:coocx x:xxx:xx:xx xxxxxxxx xxxxxxxxFCS Octet2 xx::co:xxx x:x::xxx:xxx xx:x::cocx:::< xxxxxxxx

NOTES:1-10-3, Slip - 1, all other parameters :::00 0, N(t) =- 1t-I o- 2, Severely-Errored Framing Event =- I, all other parameters =- 0, N(t.) =- 2t-t o- l , CRe Error Events - 1, all other parameters ::0 0, N(t) =- 3I-to. CRC Error Events =- 320, all other parameters =- 0, N(t) = 01-10+1, CRe Error Events .... 0, all other parameters = 0, N(t) = 1l-to+ 2, CRC Error Events =- 6, all other parameters =- 0, N(t) =- 2t -10+3, CRC Error Events =- 40, all other parameters :01 O. N(t) =- ;)

22 •

LOCAL EXCHANGE CARRIER NI

(LEC)I

CARRIERISIGNAL

0 \ 6I \ IISTANDARD

.... 1~ I

PULSE II

60III( L ~

0 6I...

AMERICAN NATIONAL STANDARD TIA03-19g9

CUSTOM~q INSTALLATION(CI)

CI SIGNAL

POLSE AS SHOWNIN FIGURE 2

1J

NOTE: L is the loss, a.t 772 kHz, of the indica.ted cable section,0.0 9- ~15.S dB.

Figure 1Network Interface

23

A.MERICAN NATIONAL STANDARD T1.40S.19g9

SEE TABLE BELOWFOR CORNER POINTS

.....................•.............. , ,......•.•.

-0.2

-0.3 t-0.4

-0.5 _-J.._-J.._-L.._-J.._--lo-_-'--_-J.... "'"'- "'"'- ---'

·0.1

1.2 rL1[1.0

0.9\

W 0.8 rC

,0.7 \-:::;)~

:::i 0.6C.:a 0.5~

Q 0.4WN

0.3::r<t:E 0.2a:0 0.1%

0.0

-500 -4 00 -300 -200 -1 00 ° 100 200 300 400 500 600 700 800

TIME (ns)

Maxirrrurn CurveNanoseconds -500 T ·258 ·175 -175 r -75 a 175 228 500 iSO

TIME-0.7T \ -DAD -0.21 1.0.12Unit Intervals -0.27 0 0.27 0.35 0.11 1.16

NORMALIZED0.05 I 0.05 1AlviPLlTUDE 0.8 1.20 1.~ 1.05 1.05 0.05 0.05 0.05

MinimUID. CurveNanceeeonds ·500 -ISO -ISO ·100 a 100 I 150 150 300 396 I 600 750

TIME I0.23Unit Intervals -0.77 -0.23 -0.23 -0.15 0 0.15 0.23 0.46 0.61 0.93 1.16

NORMALIZED1.0.05 0,95 \ IAMPLITUDE -0.05 0.5 0.9 0.9 0.5 -0.45 -0,45 -0.26 -0.05 -0.05

Figure 2Isolated Pulse Tem.plate and Corner Points

24

8.3 rns

160Hz :::: 16.7 ms

•

AMERICAN NATIONAL STANDARD T1.403-19g9

Time )IDa

NOTES:(1) Envelope of pulse amplitudes shall lie within the shaded area.(2) Reference (100 percent point) may be any amplitude in the range of 2.4 to 3AS volts.

Figure 3Pulse Amplitude Envelope with 80-Hz Longitudinal Currents

25

A.MERleAN NATIONAL STANDARD T1.403-19S9

0_1_

SLOPE:I

/1%I

I

20 dB/OEaDE

~I

--- BAND 2 ---

10 Hz --- BAND 1--- ..0 kHz (SEE NOTE)

8 kHz ~o kHz (SEE: NOTE)

FREQOENCY (LOG SCAlZ)

NOTE: 40 kHz represents the current upper limit. (or the bands 1 and 2 cue-off frequency based on current test equipment.

Figure 4Frequency Weighting Functions for Jitter Specifications

--------------- 1 Frame --------------...:125~ S~. 193 Bits

I TIme

I .. 1 11-1 .. 2 )III Slot /I I -IE 24 ... I

I F I 1 2 3 4 5 6 7 B I 1 2 3 4 5 6 7 8 1 Bit # I 1 2 3 4 5 6 7 8 1I I I i I I

~~lflr~Lfw~----0lJl~

Figure 5Channelized DSl Fram.e Bit Assignments

26

A..MERICA.1"l' NATIONAL STANDARD Tl.403-19g9

OCTET NO. OCTET LABEL OCTET CONTENT

VARIABLE

01111-110

00111000 or 00111010

00000001

00000011

'IIIIIIIIrONE-SECOND REPORTIIIi!I!J

)rto-l)

Irt o- 2j

I~tO')

1t')35678 -FLAG

SAPI C/R EATEl EA

I CONTROL

G3 LV G4 VI V2 G5 5L G6

FE SE LB Gl I R G2 Nm Nl

G3 LV I G4 I VI V2 GS I 5L G6

FE 5E LB Gl R G2 Nm Nl

G31

LV\

G4 VI V2 GS SL G5

FE SE LB G1 R G2 Nm Nl I

G3 LV IG4 Ul U2 GS SL G6

FE I SE I LB Gl R I G2 Nm NlI I

FCS

9

8

1314

7

11

12

6

5

3

4

10

1

ADDRESS001110000011101000000001

INTERPRETATIONSAPI""'14. CfR-O (CI) EA=OSAPI-14, CjR-l (Carrier) EA=OTEl- 0, EA-l

CONTROL00000011

INTERPRETATIONUnacknowledged Information Transfer

INTERPRETATIONCRClS Frame Check Sequence

Reserved [Default value is 0)

One-second report modulo 4 counter

INTERPRETATIONcac Error Event"'" 11 < cac Error Event. ~ ·55 < eRC Error Event ~ 1010 < CRe Error Event ~ 100100 < CRe Errcr Event. ~ 319cac Error Even t ~ 320

Severely-Errcred Framing Event ~ 1 (FE shall--O]

Frame Synchronization Bit. Error Event ~ 1 (SE shall-a)

Line Code Violation Event ~ 1

Slip Event 2:: 1

Payload Loop back Activated

---"Un-der study for synchronization

FCSVARIABLE

SE =a 1

FE -1

LV = 1

5L.;=; 1

La -1

UI. U2 - 0

R "'" 0

NmNI - 00. 01, 10, 11

ONE-SECOND REPORTGl =- 1G2 =- 1G3:::a 1G4 .... 1G5 =oK 1G6 -1

I

I

I

III

I\

Figure 6Performance Report Message Structure

27

AMERICAN NATIONAL STANDARD T1.403-19g9

3EgrvE [n ------.,70

CARRIER

cr [TRTRANSMIT

CI [TrnANSMI'I' R

~~ro~~N [~ftIIII!j~~\ Rl Tl R T I

To aNOTE: Do not connect cable shield to pins of this connector.

Figure 7Connector Pin Assignments (S-PositionjRJ48C)

(" ~IVE [~ill

I

i ISHQRI:mG ~M. ±8SHORT ::u::t1OVED --.ON PLUG rNSER'I'!ON _I •

1\ 2 3/\ 4 5

MINIA'l"UREa-rosITION

?LUG

r------------------jI ...... .l .......... .l .... \\ I I I I I I I I I, I

.~-------------------

R T

l1!i

I

To CI

NOTE: Do noc connect cable shield to pms of this connector.

Figure 8Connector Pin Assignments (8-PositionjRJ48X with Shorting Bars)

28

AMERICAN NATIONAL STANDARD T1.403-19g9

r- eI [ Tl50I

RECEIVE R1i ITO ICARRIER Iex [~

I I ToTRANSMIT I CI

II!

Posicion

Line Tl Rl T R

1 26 1 27 :22 29 4 30 53 32 7 33 84 3S 10 36 115 38 13 39 14

6 41 16 42 171 H U~ i6 20

8 47 22 48 es

NOTE: Do not connect cable shield to pins of this connector.

Figure 9Connector Pin .Assignm.ents (50-PositionjRJ48M)

29

AMERlCAN NATIONAL STANDARD T1.403-1989

ToCI--+--i~-------"'r------14

[;11rI -f.--

l+-------+--

l..

CIRECEIVE

CITRANSMIT

TOCARRIER

\

•Position

Line Tl Rl T R25 1 39 14

2 27 2 40 153 28 3 41 164 29 4 42 17s 30 5 43 186 31 6 44 197 32 7 45 20s 33 8 46 ~l

9 34 9 47 'l'l

10 35 10 48 2311 35 11 49 2412 37 12 50 ~5

NOTES:(1) Do not connect cable shield to pins of this connector.(2) This is the preferred multi circuit connector.

Figure 10Connector Pin Assignments (50-Position/RJ48H)

•30

•

Appendixes (These Appendixes are not. part. of American Nat.ional Sta.n dar d Tl.403-1 Q89, but are

included for information oniy.)

Appendix A

Cable Characteristics for Polyethylene Insulated Cable (PIC) a.nd PULP

PIC, 26ga., 120· F PIC, 26ga., 70· F

Freq. Re(Zo) Im{Zo) r Freq. Re(Zo) Im(Zo) r(kHz) (0) (0) (dB/roi) (deg/roi) (kHz) (D) (D) (dB/mO (deg/mi)

0.001 21655 -2164.3 0.1 0.6 0.001 20552 -20551 0.1 0.50.005 9684 ·9579 0.2 1.4 0.005 9196 -9191 0.2 1A

0.010 6848 -6844 0.3 2.0 0.010 6502 -6499 0.3 1.90.015 5S91 -5588 0.4 2.5 0.015 5309 -5306 0.4 2.40.020 4842 -4839 0,4 2.9 0.020 4598 -4595 0,4 C)"T-.10.030 3954 -3951 0.5 3.5 0.030 3755 -3752 0.5 3.40.050 3063 -3060 0.7 4.6 0.050 2909 -2906 0.7 4.30.070 2589 -2586 0.8 5A 0.070 2459 -2455 0.8 5.1

0.100 2167 -216.3 1.0 6.5 0.100 2057 -2054 0.9 6.10.150 1770 -1766 1.2 7.9 0.150 1680 -1676 1.1 7.50.200 1533 -1529 1.4 9.2 0.200 1455 -1451 1.3 8.70.300 1252 -1247 1.7 11.2 0.300 1190 -1184 1.6 10.70.500 971 -965 2.2 14.5 0.500 923 -916 2.1 13.80.700 822 -815 2.5 17.2 0.700 781 -773 2.5 16.3

1.00 689 -680 3.1 20.6 1.00 655 -545 2.9 19.61.50 564 -554 3.8 25.3 1.50 536 -525 3.6 24.02.00 490 -478 4.3 29.3 2.00 466 -453 4.1 27.93.00 403 -388 5.3 36.1 3.00 383 -368 5.0 34..45.00 316 -297 6.7 47.2 5.00 301 -281 6.4 45.07.00 271 -248 7.9 56.6 7.00 258 -234 7.4 54.0

10.0 231 -203 9.2 69.0 10.0 221 -192 8.7 65.915.0 195 ·161 10.9 87.2 15.0 186 ·151 10.3 83.520.0 174 ·135 12.3 103.9 20.0 167 -127 11.5 99.830.0 151 -104 14.2 135.1 30.0 146 -97 13.2 130.550.0 131 ·73 16.5 195.1 50.0 127 -67 15.3 190.170.0 122 -57 17.9 254.4 70.0 1Hl -52 16.5 24.9.3

100. 115 -43 19.4 34.4.3 100. 114 -39 17.7 339.3150. III -31 21.0 496.1 150. no -28 19.3 491.3200. 109 -25 22.5 649.1 200. 108 -23 20.7 644.2300. 107 -19 25.4 955,4 300. 106 -17 23.6 949.5500. 105 -14 31.0 1561.3 500. 104 -13 29.3 1551.8700. 103 -11 36.3 2156.9 700. 102 -11 34.5 214.2.8

1000 102 -10 43.4 3036.3 1000 101 -9 41.2 3014.81500 100 -8 53.1 4487.7 1500 99 -, 50.5 4452.72000 99 -7 61.3 5929.2 2000 98 -6 58.3 5879.93000 98 -6 75.0 8795.4 3000 97 -5 71.6 8715.35000 97 -4 96.8 14491.3 5000 96 -4 92.5 14345.0

31