Nortel DMS-100 Series Maintenance Manual page 78

2-58 Star Remote System hardware
Star Module. When the input ac voltage returns to within the 46 to 50 V range,
the batteries are automatically disconnected.
Note: Because there is one set of batteries in the Star Module, only one
hardware test of the batteries is run every day and every 3 months.
The TSS monitors the batteries for battery voltage and performs a 10-minute
battery capacity test once every 3 months. During this test the battery voltage
is checked every 15 s to make sure the battery voltage does not fall below 48.2
V dc ± 0.2 V dc. If the battery test fails, the SMC card sends a battery failure
alarm to the Star Hub. In addition, one temperature sensor is above the
batteries to assist in the battery voltage compensation circuit. Every day the
batteries are checked that they are connected and supply power.
Main distribution frame blocks There are seven MDF blocks located at the
bottom of the TSS backplane. Each MDF block contains up to ten solid state
lightning protectors. There is one protector for each line. The exposed vertical
end of each MDF block is easily removed to access subscriber line test points.
The test points permit separate testing of the subscriber side and Star Module
side of the line. A Nortel Networks provided cable, part number A0766452
that connects to the MDF block, is provided with the Star Module to monitor
the subscriber line to the network side and to the subscriber side. In addition,
if a lightning protector requires replacement, a tool is available to pull the
MDF block.
SRMO cabinet
The SRMO cabinet is designed for outside use and can be pad, pole, or
deck-mounted. The SRMO cabinet includes the following in addition to the
TSS:
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When the door to the SRMO cabinet is opened, a door interlock switch is
opened. A door alarm is sent to the RLD PES system to notify operating
company personnel of the open door condition. The interlock can be pulled
out to silence the alarm while maintenance activities are performed. When the
door is closed the interlock is set to the closed position.
297-8353-550 Standard 05.01 March 2001
metal enclosure, including front access door and top cover
power components, including 100 V ac/220 V ac to 50 V dc rectifier and
four 12 V batteries, and ac power panel
transmission components including support for an LTU for fiber optic or
copper termination and a fiber optic organizer
environmental controls, including fans, heaters, temperature sensors,
humidity sensors, and thermostats