INTRODUCTION AND OPERATION
1-7
August 2000
Part No. 001-2001-200
1.11.4 POWER SUPPLY
The power supply is sealed and the line and sup-
ply fuses are inside. If a supply fuse opens, the power
supply must be removed and opened for repair (see
Section 2.4 and 8.5). Refer to the power supply ser-
vice manual 004-2000-810.
Standby Battery Jack
This provides a connection point for a +24V DC
standby battery. Current is drawn from the battery
only when the power supply output voltage is lower
than the battery voltage. A trickle charge switch on
the supply ensures that the battery is fully charged.
Disable this switch when a separate battery charger is
used (see Section 2.5).
1.12 REPEATER INFORMATION
1.12.1 INTRODUCTION
NOTE: The VIKING VX does not require a separate
LTR logic drawer.
The repeater model used in an LTR system is
determined by frequency range. 800 MHz systems use
the VIKING VX (2008-232/-234) or LTR 8000s, UHF
use 20x4-232/-234 or 1010s, and VHF use 2011/2031-
213 or 1100s. Repeaters operate on a single frequency
(one repeater is required for each channel). The MPC
in each repeater performs all control and signaling
functions on that channel. Information is exchanged
between repeaters via a high-speed data bus (modular
cable). No system controller is required.
Optional accessories, such as the Telephone Inter-
connect Card (TIC) can be installed in the repeater and
the ID Validator drawer can be installed in the repeater
rack. Refer to Johnson LTR ID Validator Manual, Part
No. 001-4408-501 and Johnson Telephone Intercon-
nect Card Manual, Part No. 004-2000-370 for detailed
information.
1.12.2 HOME REPEATERS
All mobiles have one of the site repeaters
assigned as its "Home" repeater. This is the repeater
from which it receives most of its control informa-
tion. When a mobile is not placing or receiving a call,
it is always monitoring its Home repeater to deter-
mine which channel is free and if it is being called by
another mobile.
The Home repeater is always used to make a call
unless it is busy. When the Home repeater is busy, any
other repeater in the site may then be used. Up to 250
ID codes are assigned to each repeater. An ID code
and Home repeater number are the "address" of the
mobiles in the system. Therefore, up to 1250 separate
addresses can be assigned in a 5-repeater system and
up to 5000 can be assigned in a 20-repeater system.
An ID code may be assigned to an individual mobile
or a group of mobiles as required.
1.12.3 INTER-REPEATER DATA COMMUNICA-
TION
Data communication between VIKING VX and
LTR repeaters at a site is via a high-speed data bus.
This bus cable is installed in a daisy-chain manner
between repeaters. If both VIKING VX and LTR
repeaters are located at a site, 20 repeaters can be
interconnected. Refer to Section 2.8 for information
on connecting the data bus.
1.12.4 MOBILE TRANSCEIVERS
The mobile and handheld transceivers used in an
LTR system must be compatible with the type of sig-
naling in use and also the frequency range.
1.13 REPEATER DATA BUS SIGNALING
1.13.1 GENERAL
A single-line serial data bus interconnects the
logic units of all the LTR repeaters at the site. The
first repeater powered on generates the synchroniza-
tion pulse that is used by all other repeaters to deter-
mine their time slot on the data bus. If all repeaters are
powered on at the same time, the lowest numbered
repeater generates the synchronization pulse. There
are 21 slots with 1-20 used for repeater reporting and
21 used by the ID Validator (see Section 1.13.3). The
time slot used by a repeater is determined by the num-
ber assigned to that repeater by the programming in
the MPC. Repeater 1 uses time slot 1, repeater 5 uses
time slot 5, and so on. The data rate on the repeater
data bus is 18,750 bits per second.
Содержание VIKING VX
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