General Dynamics R2600 Series User Manual

Section 8
ASTRO TRUNKING INTRODUCTION
8-1 INTRODUCTION
The General Dynamics R2670 Digital Communi-
cations System Analyzer tests the unique
requirements of Motorola's Astro trunked mobile
and portable radios. All R2600 Series capabilities
are retained with the trunked test sequences
accessed via the LCD display, numeric keypad,
screen defined softkeys, cursor movement keys,
and the optical tuning knob. The trunking option
functions may also be accessed via the remote
control interface port.
The trunking option simulates the functions of a
central controller of a trunked radio system by
providing control channel and voice channel
signaling protocols. Testing with the trunked radio
option provides dynamic call processing and
direction to a voice channel. Once on the voice
channel, the general purpose RF test capabilities of
the analyzer can be used to measure the radio per-
formance. Trunk option testing provides proof of
basic inbound and outbound signaling and displays
specification compliance data.
Throughout this manual the "system" refers to the
fixed-end central controller. Thus, a system
initiated call is the analyzer simulating the central
controller calling the radio under test.
8-2 CAPABILITIES
The trunking option has the following capabilities:
Vocoder Capabilities
The analyzer allows the selection of either the
Astro VSELP or Astro IMBE vocoder for voice
channel operation. Control channel signaling is
not affected by the selection, therefore Astro
VSELP and Astro IMBE tests are identical. The
Astro IMBE vocoder is used when testing Astro
3.0 Trunked Systems. Vocoder selection occurs
in the Sig Type field as described in Section II of
this manual. Throughout this manual the use of
the term “Astro” solely, applies to either Astro
VSELP or Astro IMBE.
Dynamic Call Processing
Test trunked mobile and portable radios under
actual signaling conditions by simulating the
function of the central controller. The trunking
analyzer provides separate screens for inbound
(radio initiated) and outbound (system initiated)
calling modes.
Closed Cover Measurements
The analyzer measures and displays transmitter
power, frequency error, and frequency deviation
while in the dynamic calling mode. While the
radio is on the voice channel, the operator can
make additional measurements using other
functions of the analyzer.
133

General Dynamics R2600 Series Specifications

General

Brand	General Dynamics
Model	R2600 Series
Category	Measuring Instruments
Language	English