Aeroflex 2945A - Chapter 1 GENERAL INFORMATION; Introduction

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Chapter 1
GENERAL INFORMATION
Contents
Introduction ................................................................................................................................. 1-1
Connections.......................................................................................................................... 1-2
Performance Data........................................................................................................................ 1-3
General EDACS system information ................................................................................... 1-3
Autorun parameter settings................................................................................................... 1-4
MI-BASIC programs................................................................................................................... 1-8
Introduction
EDACS is a trunked private radio system, used mostly in emergency services and utilities, which
uses either 9600 or 4800 bits/second signaling on the control channel, and 150 bits/sec on the
working channel, transmitted using FSK data. The EDACS system is proprietary to Ericsson GE.
The EDACS system test software, for Service Monitors 2945A, 2945B, 2946A, 2948 and 2948B,
is produced by Aeroflex under license from Ericsson GE.
The systems mode of the Service Monitor provides a means of testing radio communication
equipment, such as cellular radio telephones and trunked system mobiles and repeaters.
To test a repeater, the Service Monitor simulates signaling transmitted by a radio, which is
received by the repeater under test. Signaling transmitted by the repeater is received by the
Service Monitor for measurement or analysis.
This manual refers to the use of the Service Monitor to test the performance of repeaters designed
to operate on the EDACS system.
The Service Monitor and the repeater are connected using either suitable RF cables for connecting
to the antenna sockets of the repeater, or to an aerial for testing off-air. AF connections are made
to the audio input and output circuits of the repeater for tests such as signal to noise, modulation
distortion etc.
Auto and manual testing
The AUTO mode allows you to run test programs that are resident within the Service Monitor and
test the operational performance of the repeater for use on a EDACS system. User-defined
programs can be loaded into the Service Monitor and run in the same way. The MANUAL mode
offers manual control of the Service Monitor mobile simulation. This is useful for fault finding or
adjusting of the repeater under test.
Auto
Th
e AUTO mode provides a built-in test program that may be run on a channel to test the
performance of the repeater.
The progress of tests, and the results obtained from them, are displayed on the screen and stored in
memory within the Service Monitor for later analysis. Results can be printed on a suitable printer
while the test program is running or at the end of the test program. The set-up menus allow many
combinations of data presentation, storage, retrieval and printing. The use of the memory cards
and remote control facilities extends this further.