Motorola - Trunking Concepts

  • View
    413

  • Download
    68

Embed Size (px)

Text of Motorola - Trunking Concepts

TRUNKING CONCEPTS

TRUNKING CONCEPTSIntroduction This training program covering Trunking Concepts is intended to provide customer technicians the prerequisite knowledge required for the SmartZone and SmartZone OmniLink training programs. Although the main audience intended for this training is Motorola, customer, and dealer/MSS technicians, the first five modules may be appropriate for other audiences such as Motorola/Dealer sales personnel, customer management and administrative personnel, and others with a need to learn Motorola trunking concepts. The remaining modules (6 - 8) are more detailed and technically oriented and may not be appropriate for all audiences. Module Titles Module 1. Introduction to Trunking Module 2. How Trunking Works Module 3. Trunked Call Types Module 4. Trunked System Features Module 5. Private Trunked Systems Module 6. Trunking Signaling Module 7. Type I vs. Type II Trunking Module 8. System ID Structure Objectives Upon completion of this segment of the training, the learner should be able to: Define trunking. Describe the advantages of trunking. Identify the FCC loading requirements for trunked systems. Explain how users are organized in a trunked system. Identify the components that comprise a basic trunked system. Explain the basic functionality of a trunked system and how a call is processed. 1-3 2-1 3-1 4-1 5-1 6-1 7-1 8-1

Motorola Confidential

1-1

V.1.0

TRUNKING CONCEPTS

Differentiate between message trunking and transmission trunking. Describe trunked system access features. Describe the timeout parameters used in a trunked system. Describe the trunked system reliability features. Describe each of the trunked systems types provided by Motorola. Describe the Voice on Control (VOC) operation available in Motorola trunked systems. Describe the ID structure used in a trunked system.

Motorola Confidential

1-2

V.1.0

TRUNKING CONCEPTS

Module 1: Introduction to TrunkingContents Topic 1: Trunking Concepts 1-4 This topic introduces the concept of trunked systems and shows how non-trunked and trunked systems compare. Topic 2: Trunking Features and Advantages 1-8 This topic describes important features and advantages of Motorola trunked radio systems. Activity 1-10 In this activity, you will match features and advantages of trunked radio systems with their descriptions. Topic 3: Channel Loading Criteria 1-11 This topic describes FCC requirements for channel loading in two-way radio communication systems. Module Exercises 1-12 This module ends with exercises that test your mastery of module objectives. Introduction The purpose of this module is to provide a definition of trunking and to introduce the learner to the advantages of trunking over other types of two-way communication. This module will also explain the FCC loading requirements for a trunked system. Objectives Define trunking. Describe the advantages of trunking. Identify the FCC loading requirements for trunked systems.

Motorola Confidential

1-3

V.1.0

TRUNKING CONCEPTS

Topic 1: Trunking ConceptsIntroduction Trunking is a telephone company concept that refers to the automatic sharing of a small number of communications paths among a large number of telephone subscribers. In two-way radio communications, trunking refers to the automatic and dynamic sharing of a small number of radio channels between a large number of radio users. A trunking system efficiently distributes message traffic among the available channels and reduces channel waiting time.

Motorola Confidential

1-4

V.1.0

TRUNKING CONCEPTS

Non-Trunked Communication System Compare a non-trunked communication system to a group of toll booths on a toll highway. Red cars must use the red both, green cars must use the green booth, and blue cars must use the blue booth. As long as there are about the same number of cars of each color, the toll booths are used efficiently.

A number of red cars may stack up waiting for the red booth to become available. Even though there are no green or blue cars, the red cars must wait because they can use only the red booth.

Motorola Confidential

1-5

V.1.0

TRUNKING CONCEPTS

Trunked Communication System Compare a trunked communication system to the system many airlines use to handle queuing for ticket agents. Any agent can handle a transaction for any user. There is a single queue, and each user is handled by the next available ticket agent. If there are fewer users than ticket agents, there is no waiting.

If there are more users than ticket agents, a single queue builds up. The single queue gives all users equal access to the available ticket agents. The effectiveness of trunking is predicated on two fundamental characteristics of user communication: It is improbable that a large percentage of users will want to make a call at the same time. Most conversations are relatively short.

Motorola Confidential

1-6

V.1.0

TRUNKING CONCEPTS

Topic 2: Trunking Features and AdvantagesIntroduction The graphic below lists a number of features and advantages of Motorola trunked radio systems. These features and advantages are described in the following sections.

Faster System Access Users have faster system access since all repeaters in the system are typically made available to all users. In addition, voice channels are assigned automatically, eliminating the need for the user to monitor and wait for a clear channel Better Channel Efficiency All channels are typically shared by all users, resulting in an overall decrease in channel congestion. User Privacy Groups of users can be assigned exclusive use of a voice channel for the duration of a conversation. Users in other groups cannot listen to that channel. Types of Communication Users can initiate a wide variety of calls including one-to-one, one-to-many, and one-to-all.

Motorola Confidential

1-7

V.1.0

TRUNKING CONCEPTS

Queuing The queuing capabilities of a trunked system provide a more orderly approach to system access. A feature called new user queueing makes it possible for the radio user to set down the microphone and wait for a call back once a busy signal has been received. This relieves the user from having to continually rekey the PTT button in order to gain system access. Automatic Retry Automatic retry eliminates the need for a user who is experiencing bad signalling conditions or interference to continually key and dekey the radio in order to gain system access. Priority Levels Provision for different levels of priority ensures that critical users have more immediate access to the system. A feature called recent user priority ensures that ongoing communications can be completed on a priority basis over conversations that are just being initiated. Flexible Expansion Additional users can be added without necessarily adding additional channels or modifying existing radios. Continuous Assignment Updating The continuous assignment updating feature ensures that a radio just coming into service in the middle of a conversation will immediately be assigned to the appropriate voice channel so that the user can be included in that conversation. User Call Organization The user call organization feature allows a user to organize the radio system around functional, or operating groups, rather than according to frequencies or channels. Fail Soft The Failsoft feature ensures continued communications capability in the case of a malfunction of the central controller. System operation reverts to operation in a non-trunked system in which talkgroups are assigned to fixed voice frequencies.

Motorola Confidential

1-8

V.1.0

TRUNKING CONCEPTS

ActivityMatch each of the following features and advantages of trunking with the statement that best describes it. Features and Advantages: A. B. C. D. E. F. User Privacy Queuing Automatic Retry Priority Levels Continuous Assignment Updating Fail Soft

Descriptions: B Allows a user to wait for a call back after a busy signal has been received. C Avoids the need to continually key the radio in order to gain system access when experiencing signal problems. F Ensures continued communications capability in the case of a malfunction of the central controller. A Allows different groups of users to be assigned exclusive use of a voice channel for the duration of a conversation. D Provides critical users with more immediate access to the system than noncritical users. E Ensures that a radio just coming into service in the middle of a conversation will immediately be assigned to the appropriate voice channel.

Motorola Confidential

1-9

V.1.0

TRUNKING CONCEPTS

Topic 3: Channel Loading CriteriaIntroduction The FCC assigns radio frequency channels to users based on an expectation that those channels will be effectively utilized. The FCC considers a fully-loaded channel to be one that serves 100 users. 5-Channel Loading When the FCC grants a 5-channel license the system owner has 2 years to accomplish 70% loading. This means that within 2 years, the system owner must be serving at least 350 users with those five channels. 20-Channel Loading When the FCC grants a 20-channel license the system owner has 5 years to accomplish 70% loading. This means that within five years, the system owner must be serving at least 1,400 users. The FCC may delete channels if the system owner is not able to accomplish 70% loading in the allotted time.

Motorola Confidential

1-10

V.1.0

TRUNKING CONCEPTS

Module ExercisesMultiple Choice

In a trunking system, repeaters are used in the following manner: a. b. c. d.Multiple Choice

Each user is assigned to a partic