Simplex And Switched Carrier Operation; Features - GE MDS 4790 Series Installation & Operation Manual

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TX LOW
RX HIGH
RTU
REMOTE RADIO
TX LOW
RX HIGH
RTU
REMOTE RADIO
TX LOW
RX HIGH
POLLING REMOTE
HALF-DUPLEX
SWITCHED CARRIER
Figure 3. Typical Repeater and Polling-Remote Network

Simplex and Switched Carrier Operation

System-wide simplex operation is achieved by switching the master sta-
tion carrier on to transmit, then off to receive. The same frequency is
used for both transmit and receive.
Switched carrier, half-duplex mode works in the same way, except dif-
ferent frequencies are used for transmit and receive.

2.4 Features

Reliability is a hallmark of the MDS 4790/9790 design. The radio
employs a one-piece transceiver board which minimizes RF losses and
eliminates the need for inter-board cabling. This also allows easy
plug-in replacement if servicing is necessary.
In addition, the optional redundant version of the radio includes redun-
dant transceiver boards and power supply modules that automatically
activate if a failure in either of the transceiver boards or power supplies
occurs. This ensures continued operation in the event of most trans-
ceiver board failures.
The following list highlights many of the radio's key features. For a full
listing of specifications, refer to
beginning on Page 97.
MDS 4790/9790 Series I/O Guide
RTU
CONTINUOUSLY
KEYED
RTU
TX HIGH
REPEATER
RX LOW
HOST SYSTEM
Section 10.1, Technical Specifications,
MDS 05-3438A01, Rev. F
REMOTE RADIO
TX LOW
RX HIGH
RTU
TX LOW
RX HIGH
REMOTE RADIO
REMOTE RADIO
TX LOW
RX HIGH