Service manual

INTRODUCTION AND OPERATION
1-2
Month 2000
Part No. 001-2004-601
mum system efficiency. Each radio is assigned a
Home Channel which sends system commands to
specified radios. There are normal words and special
function words. The special function words are used
to initiate special calls; Telephone, Unique ID, and
Data by Unique ID. The special function words are
also used for command calls: Interrogate, Kill, Reas-
sign, Electronic Serial number Authentication, Regis-
tration, De-Registration, etc.
Since each repeater is responsible for signaling
on its own channel, this approach lends itself well to a
distributed processing logic controlled approach
requiring only a small logic unit within each repeater.
These processors share information over a communi-
cation path. This architecture permits each repeater to
be autonomous. A failure in one repeater leaves the
remainder of the system intact and operational.
The repeaters may be connected to a larger sys-
tem. This allows the system to perform some of the
previously mentioned calls. The Switch may commu-
nicate from one LTR-Net Locality to another. The
system equipment may be centrally located or distrib-
uted at each Locality. A Locality is a set of repeaters
that are interconnected to pool the channels in a
trunked channel group.
1.5 LTR-Net SIGNALING
The repeater covered by this manual utilizes
LTR-Net signaling. This signaling provides advanced
features such as 65504 Unique ID codes, five levels of
access priority, home channel backup, and over-the-air
mobile reprogramming. LTR-Net signaling and
repeater control is provided by the Main Processor
Card. The repeater connects to the 3000 Series Switch
using a phone line or some other type of link. The
Switch provides overall system control (see Sections
1.14 and 5 for more information on LTR-Net equip-
ment and features).
1.6 ACCESSORIES
The accessories available for the Viking VX
LTR-Net repeater are listed in Table 1-1. A brief
description of some of these accessories follows.
2000 Series Service Kit- This kit includes an extender
card, extender cables, TIC bias cable and programming
cable. These items are used when tuning the repeater
and while troubleshooting.
Battery Backup Option - It includes the +26V DC
battery backup module that resides in the power supply
and the necessary interconnect cabling to connect the
repeater to the batteries (see Section 2.5).
Two Foot Cable - This is a 2’ RG-58 coax cable with
BNC male connectors for the HSDB (High Speed Data
Bus).
Six Foot Cable - This is a 6’ RG-58 coax cable with
BNC male connectors for the HSDB (High Speed Data
Bus).
Custom Frequency - This is a factory frequency pro-
gramming and repeater setup.
PGMR 2000 Programming Software - 3.5" program-
ming disk used to program the repeater.
External Speaker/Microphone - This is a speaker and
microphone combination that plugs into the MAC con-
nectors. The microphone provides local audio and
push-to-talk, while the speaker provides local audio ad-
justed with the volume control.
Table 1-1 ACCESSORIES
Accessory Part No.
2000 Series Service Kit* 250-2000-230
Programming Cable Kit 023-2000-195
Battery Back-Up Option** 023-2000-835
2’ RG-58 BNC M-M HSDB cable 023-4406-505
6’ RG-58 BNC M-M HSDB cable 597-3001-214
Custom Frequency Programming & Setup 023-2000-100
PC Programmer PGMR Software 023-9998-459
Service Microphone 589-0015-011
50 ohm Termination HSDB 023-4406-504
*Includes: extender card, extender cables, TIC bias cable
and programming cable kit.
** 26V DC input with cable