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INTRODUCTION AND OPERATION
1-9
March 1999
Part No. 001-2009-600
Repeater Connection To Switch
The repeaters can be located at the same Locality
as the Switch or they may be located at a Locality that
is many miles from the Switch. A voice and data link
is required between the repeaters and Switch. This
link can be a direct connection, phone lines, micro-
wave, RF transceiver, fiber optic, or some other type
of link. This link is connected to the repeater terminal
block on the back of the repeater.
The voice link routes transceiver voice to and
from the Switch. The voice must be routed to the
Switch when a call involves a dispatcher, telephone
interconnect, or another RF channel or LTR-Net sys-
tem. If the call is a mobile-to-mobile call on the same
RF channel, the voice is simply repeated by the
repeater (it is also routed to the Switch but is not con-
nected to anything). The voice path input/output port
interfaces with a standard 4-wire, 600 ohm phone line.
The data link allows the Switch to control the
repeater. With mobile-to-repeater calls, the data fed to
the Switch is used to determine what routing is
required for the call. On Switch-to-mobile calls, the
data fed to the repeater allows the Switch to operate
the repeater like a base station.
There are three different types of links that can be
selected for the data path between each repeater and
the Switch. The MPC is programmed for the type of
link used (see Section 1.11).
• A 4-Wire voice-grade link can be used that is similar
to the audio link. The data is then sent as tones using
FSK modulation.
• RS-232 serial inputs and outputs are available for
direct connection or connection to a link that accepts
RS-232 data.
• Data can be modulated as in ’1’ and then sent over
the voice path using a Blank and Burst technique.
Only one 4-wire link is then needed between each
repeater and the Switch.
Figure 1-3 LTR-Net SYSTEM COMPONENTS
MOBILE TRANSCEIVER
MOBILE TRANSCEIVER
MOBILE TRANSCEIVER
CONVENTIONAL
LTR
LTR-Net
LTR-Net REPEATERS
(UP TO 20 PER SWITCH)
AUDIO AND
DATA LINK
AUDIO AND
DATA LINK
AUDIO AND
DATA LINK
SYSTEM and SUBSCRIBER MANAGER (SSM)
PUBLIC SWITCHED
TELEPHONE NETWORK
(PSTN) OR PABX
OTHER SWITCHES
AND SYSTEMS
TIM
WAM/SNM
CIM
CIM
CCM
NetNIM
3000 SERIES SWITCH