Section 23
PROJECT 25 TRUNKING INTRODUCTION
23-1 INTRODUCTION
This m
anual contains information for using the
R2670 and R2625 Digital Communications
System Analyzers with the Project 25 Trunking
Option. The analyzer provides unique testing
features for Project 25 Trunking based
communications equipment. All R2600 series
capabilities are retained with the Project 25
Trunking tests accessed via the LCD display,
numeric keypad, screened defined softkeys,
cursor movement keys and the optical tuning
knob.
23-2 CAPABILITIES
The Project 25 Trunking Option is capable of
generating and receiv
ing a Project 25 signal. A
Project 25 signal relates to the Association of
Public-Safety Communications Officials
International (APCO) Project 25 digital standard
Common Air Interface (CAI) signaling scheme in
which a serial bit stream is encoded, mapped into
one of four corresponding amplitudes, filtered
digitally, and then modulated onto an RF carrier.
The Project 25 Trunking Option simulates the
functions of a Project 25 central controller by
providing control channel and voice channel
protocols to perform various tests. Call sequence
status is displayed in the form of a thermometer
with numbers 1 through N (see Appendix M)
representing the various call states. A textual
message also is displayed below the thermometer
to give an indication of call status. Features
incorporated in this option include:
Registration/Call Alert
Registration/Call Alert tests the radio’s ability to
acquire and interpret the control channel being
transmitted by the analyzer.
ID parameters are entered in the R2670 or R2625
to match the radio’s configuration. Successful
registration verifies the radio’s receiver as well as
the configuration.
Dispatch Voice
Dispatch voice capability allows the user to
verify the radio’s transition from the control
channel to the voice channel. In addition, receive
and transmit voice capability can be verified.
BASE
Provides a duplex function to transmit a C4FM
1011 Hz test pattern and receive a 1011 Hz test
pattern in either C4FM or LSM modulation. It
also provides an averaging wattmeter capability
BER
Provides receive only V.52 test pattern
functionality. Can receive either a C4FM or
LSM modulation. Displays the received BER
values.
23-3 PROJECT 25 CONNECTORS
The R2670 has two connectors as shown in
Figure 23-1. Both connectors are located on the
side of the housing. The KVL connector provides
a receptacle for loading an external encryption
key. The other connector is an interface port.
290
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