MDS 05-3628A01, Rev. B
MDS 4790M (MPT 1411) I/O Guide
5
Simplex and Switched Carrier Operation
System-wide simplex operation is achieved by switching the master station
carrier on to transmit, then off to receive. The same frequency is used for both
transmit and receive.
Switched carrier, half-duplex mode is also achieved by switching the master
station carrier on to transmit, then off to receive. However, different
frequencies are used for transmit and receive.
2.4 Features
Reliability is a hallmark of the MDS 4790M 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 should
servicing become necessary.
In addition, the optional redundant version of the radio includes redundant
transceiver boards and power supply modules that automatically become active
in the event of a failure in either of the transceiver boards or power supplies.
This ensures continued operation in the event of most transceiver board failures.
The following list highlights many of the radio’s key features. For a full listing of
specifications, see Section 8.1,
Technical Specifications
, beginning on page 72.
• Operation from 24, 48, or 125 V dc; or 90 to 267 V ac mains
• Configuration, control and diagnostics from front panel display or
connected PC
• Remote diagnostics via a connected PC and radio software
• Time stamping of alarms and major events
• Flexible mounting (rack or table); front panel can optionally be
mounted separately from unit
2.5 Accessories
The radio can be used with one or more of the accessories listed in Table 1.
GE MDS publishes an
Accessories Selection Guide
which lists a complete
array of additional items for use with this product. Please contact your factory
representative or visit
www.GEmds.com
to obtain a copy of this guide.
Table 1. Radio Accessories
Option
Description
Part No.
Diagnostics and
Control Software
Computer software that allows PC control,
diagnostics, and software upgrades.
03-3475A01
Diagnostic and
Control Interface
Cable
Allows connection of a PC for control and
diagnostics and of the radio (DB-9 to DB-9).
97-1971A04
Auxiliary Front Panel
Mounting Bracket
Allows rack mounting of the detachable front
panel.
82-3189A01
Orderwire Handset
Allows orderwire communications with
remote radios.
12-1307A01
