IFR COM-120C User Manual

6-96
SECTION 6
OPTIONS
6-15 MPT 1327 TRUNKING (OPTION 17)
The MPT 1327 Trunking Option allows protocol and parametric testing of radio units and
trunking system controllers (repeaters) designed for operation on
MPT 1327 trunked private land mobile radio systems.
MPT 1327 is an open signaling standard, originally specified by the United Kingdom
Ministry of Post and Telecommunications (now under the auspices of the Department of
Trade and Industry Radiocommunications Agency), and adopted for use world-wide.
The MPT 1327 Trunking Option 17 provides facilities for both automatic and manual
testing of radio units, repeater testing, off-air monitoring and network data
configuration/storage.
To access the MPT 1327 Trunking Option, press SPCL Test Mode Key and select the
option from the Special Menu. If the MPT 1327 Trunking Main screen is not displayed,
press SETUP Hard Key. Select Version information to verify the option is installed.
AUTOMATIC TEST MODE
An Automatic Test facility is
provided where a Radio Unit
(RU) is subjected to a series of
predefined tests with minimum
intervention.
REPEATER SIMULATOR
The COM-120C is configured to
simulate a trunked single site
repeater to manual test radio
units.
RADIO UNIT SIMULATOR
The COM-120C is configured to
simulate a trunked Radio Unit
to enable testing of the trunked
infrastructure.
OFF-AIR MONITOR
The COM-120C is configured to become an "off-air" monitor and displays the protocol
messages on screen from either a repeater or radio unit.
SETUP
The SETUP screen allows the network configuration parameters to be entered. These
parameters are required by the other test facilities.

IFR COM-120C Specifications

General

Resolution	1 Hz
RF Input Impedance	50 Ω
Third Order Intercept (TOI)	+10 dBm
Display Type	LCD
Display Resolution	640 x 480 pixels
RF Input Protection	1 W
Power Requirements	100-240 VAC, 50-60 Hz
Input VSWR	1.5:1
Phase Noise	-80 dBc/Hz @ 10 kHz offset

Summary

COM-120C Communications Service Monitor Operation Manual

Preface

Provides an overview of the manual's organization, scope, and intended audience.

Section 1: Introduction

Introduces the COM-120C, its functions, and basic operation modes.

Section 2: Installation

Provides information on preparing the COM-120C for use and operating precautions.

Section 3: Composite Controls

Details front and rear panel controls, screens, soft function keys, and menus for system interaction.

Section 4: Operation Procedures

Covers configuring and performing various operational tests like RF Generate, Receive, and Duplex modes.

Section 5: Common Practices

Offers suggestions for equipment and screen setups for common RF Generate and Receive practices.

Section 6: Options and Features

Describes optional features and accessories for the COM-120C, including testing capabilities.

Safety and Precautions

General Safety Warnings

Covers high voltage equipment hazards, servicing, case removal, and safety identification terms.

Battery Handling and ESD Precautions

Provides warnings for sealed lead-acid battery use and precautions for handling ESD-sensitive parts.

Appendix A: User I/O Connectors and Pin-Outs

Table of I/O Connectors

Details the connector names, types, signal direction, and signal types for COM-120C I/O ports.

Connector Pin-Out Tables

Provides specific pin assignments for MIC/ACC, GPIB, and RS-232 connectors.

Appendix B - Abbreviations

Soft Function Key Descriptions

An alphabetical reference for COM-120C soft function keys and their descriptions.

Appendix C - Repacking for Shipping

Shipping and Repacking Procedures

Details authorization, tagging, container requirements, freight costs, and step-by-step repacking instructions.

Index

Index-1

Alphabetical listing of topics and their corresponding page numbers for easy reference.