User's Manual

MDS 05-6399A01, Rev. D MDS Master Station 81
NOTE: DC power supply modules are available for several different input ranges. These modules have
interchangeable connectors. Make sure the supply is within the rating for the module installed.
On a redundant unit equipped with two power supplies, a supply can be removed, and a new supply can
be installed, while the unit is powered and operational. Do not remove power supplies whose power
source is still connected and active.
7.4.2 Peripheral Modules – including Platform Manager, Radio, Alarm,
and Alarm Relay Modules.
Peripheral slots on the Master Station include all slots between the power supply modules (on the left)
and the duplexer tray (on the right). On an MDS Master Station, the peripheral slots are populated with
the following modules, from left to right: Platform Manager, Radio Module, a second Radio Module if
redundant, and an Alarm Module or Alarm/Relay Module if redundant.
To remove peripheral modules, first disconnect cables attached to the faceplate of the module you are
removing. Label connections if necessary to remember how connections are made. Loosen the two
thumbscrews on the front of the module, then slide the module straight out, moving other cables out of
the way as necessary.
To install a peripheral module, align the module with the card guides and slide into the chassis until it
engages with the backplane. Push firmly on the faceplate of the module to ensure a good connection and
hand-tighten the thumb screws. The thumb screws can be further tightened with a screwdriver. Radio
Modules should be tightened to 10 in-lbs to ensure optimum heat transfer through thermal contact con-
nector on the rear of the unit.
Reconnect faceplate cabling connections to other modules as necessary.
7.4.3 Hot Swap Redundant Modules
On a redundant unit equipped with two Power Supplies and two Radio Modules, these modules can be
removed and/or installed while the unit is powered and operational. Replacing a Power Supply does re-
quire first removing the supply input for the module, but the alternate Power Supply can remain powered.
The unit will continue to operate using a single power supply.
When removing a Radio Module on a redundant unit, we recommend changing the selector switch on the
Alarm/Relay Module to lock the active radio to A or B as appropriate before removing the other Radio
Module. This should be done even if the desired radio is already active. The manual override 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.
Once a new Radio Module is installed, the Select Switch should be returned to the Center (Automatic)
position for redundant operation.
7.4.4 Internal Duplexer Tray
The duplexer tray can be removed by first removing two screws on the top of the chassis holding the tray
in place. Save these screws. Disconnect all cabling to both the faceplate of the duplexer and on the back
of the unit. Once cabling and screws have been removed, push on the connectors on the back of the unit to
free the tray from the chassis and then slide out the front. To install a new tray, slide the tray in allowing
the connectors to push through the back of the chassis. Use the same screws to secure the front of the tray
to the chassis and then reconnect cabling being careful to connect TX and RX cables from the Alarm
Module to the correct faceplate connections on the Duplexer Tray.