User's Manual

76 MDS Master Station MDS 05-6399A01, Rev. D
6.5.3 Alarm/Relay Toggle Switch (6847 Only)
For redundant units, the Alarm/Relay module includes a manual override toggle switch, which can be
set into one of three positions to associate it with a particular radio. The toggle switch is locking, and
must be pulled out to change positions. Switch functions are as follows:
 Up—Radio A
 Down— Radio B
 Center—Automatic.
When the switch is set to Automatic, the active radio is determined by radio module presence and alarm
status.
NOTE: If only one radio module is installed (A or B) it is recommended that the switch be set to A or B,
as appropriate.
The non-redundant version of the Alarm Module does not include the Toggle Switch.
6.5.4 Alarm/Relay RF Connections (6847 Only)
For redundant systems, the Alarm/Relay module includes a RF Connections for both the A and B Radio
Module, and RF OUT. These are all Dual FAKRA-SMB connectors. RF OUT is switched between Radio
A and Radio B depending on the currently active radio. RF OUT is normally cabled to the Duplexer tray
faceplate, even on systems that do not include a duplexer. Redundant systems come from the factory al-
ready properly cabled between the Radio Modules, Alarm/Relay Module and Duplexer tray faceplate.
Connectors are keyed to ensure proper orientation.
Non-redundant systems using the 6848 Alarm Module do not include RF Connections.
6.6 Duplexer Tray
Current Master Station offerings always include a Duplexer tray whether or not an internal duplexer is
included. This allows consistent cabling from either the Radio Module (non-redundant systems) or the
Alarm/Relay Module (redundant systems) to the faceplate of the Duplexer tray. Wiring internal to the
Duplexer Tray routes RF Signals to the antenna connections on the back of the Master Station as
appropriate to the order configuration.
RF Connection to the front of the duplexer tray depends upon order configuration and frequency plan.
Table 6-16. Cabling to the Duplexer Tray Faceplate
Duplexer
Option
Frequency
Plan
Cable
From - To
A
ntenna Connection
on Back
Comment
Internal TX > RX TX - HIGH
RX - LOW
COMBINED OUT Cable by Frequency Plan to High/Low
Internal TX < RX TX - LOW
RX - HIGH
COMBINED OUT Cable by Frequency Plan to High/Low
Simplex TX > RX
TX = RX
TX < RX
TX - HIGH
RX - LOW
TX
RX
Software configurable single or dual
antenna port.
External TX > RX
TX < RX
TX - HIGH
RX - LOW
TX
RX
Wire TX to High always, independent
of Frequencies