Specifications

2 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. E
All assemblies, including the duplexer and power supply, are contained
in the radio’s compact (2RU high) enclosure. The radio’s compact size
allows it to fit into most existing systems, in either tabletop or rack
mounting arrangements. Connectors are provided on the rear panel for
easy connection of power, antenna, data, alarm and diagnostic func-
tions.
2.1 Network-Wide Diagnostics
Newer MDS remote and master station radios, including the
MDS 4790/9790, Series offer network-wide diagnostics capability. Net-
work-wide diagnostics communications is a modern, packetized mode
that has several advantages over DTMF diagnostics communications
(used by older MDS radios):
• Diagnostic data can be gathered over a large radio network
without disrupting system communications flow.
• When required, diagnostics communications speed can be
increased by actively collecting diagnostic data.
• Diagnostic data for each radio in the network can be accessed
from any radio diagnostics port in the network.
• Certain messages can be broadcast to all radios in the system
simultaneously.
The MDS 4790/9790 Series master station can be used to poll remote
radios in its radio system for diagnostic data. For more information on
the implementation of network-wide diagnostics, see the MDS Network
Handbook (P/N 05-3467A01).
2.2 Redundant versus Non-redundant Operation
A redundant configuration means that the master station has two com-
plete transceiver boards and power supplies installed in the enclosure. In
the event of a failure in the primary equipment, the controlling logic
causes a switch-over to the stand-by unit. The stand-by transceiver
board is constantly operating and its operational readiness is monitored.
However, the power amplifier in the stand-by board is not operating
when it is in stand-by mode.
In a non-redundant configuration, there is only one transceiver board
installed in the “A” slot of the enclosure, and back-up transceiver board
operation is not possible.
Transceiver boards may be moved from one master station to another,
or an additional transceiver board may be added to a non-redundant
master station. You do not need to specify redundant or non-redundant
operation, or select the active transceiver board. Installing or replacing