Opm Hardware Components; Battery Control Unit - Nortel DMS-100 Series Maintenance Manual

5-6 OPM hardware
The access to the main compartment of the OPM is from the front of the
cabinet by a pair of swinging doors. Concave lock pins hinge each cabinet
door. Each cabinet door can be padlocked. Each door opens approximately
120 degrees. Each door locks in the open position by a door check. An alarm
activates when the door opens.
The OPM equipment frame contains a pair of double-latched, hinged
equipment bays. Each hinged equipment bay contains three shelves of
equipment for a total of six shelves. The OPM equipment uses four shelves.
The hinged bays allow access to the rear of the shelves. The hinged bays allow
access to additional equipment against the back wall of the cabinet.
The two LCAs of the OPM-640 LCM use two shelves. The combined LCM
(LCM-C) for the OPM-256 is a one-shelf module. The LCM-C contains two
LCAs and four line drawers. One shelf is empty.
The section OPM-256 optional equipment shelf describes the optional
equipment for the additional shelf. The RMM and HIE occupy two shelves.
The other two shelves contain an FSP that includes office repeaters, a power
control unit (PCU) for ac power, and a rectifier system. The rectifier system
consists of a pair of switch mode rectifiers and a battery control unit (BCU).
An environmental control unit (ECU) occupies the bottom of each bay.
End-access compartment
The end-access compartment is at the left end of the cabinet. The access to the
end-access compartment is a single swinging door. The compartment contains
equipment required for voice frequency (VF), special service and DS-1 pair
termination, protection, and rearrangement. Subscriber VF cables and
industry ac power enter the OPM through sealed cable entrance ports at the
base of the cabinet. Also, the cables that carry host DS-1 and special service
pairs enter the OPM the same way.

OPM hardware components

The OPM contains the same basic components as described for the OPM. The
OPM also contains the following additional components:
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Battery control unit

The BCU is in the top left hand corner of row A, bay 1. The BCU consists of
two battery charge controllers (BCC0 and BCC1). Each BCC controls four
battery strings. The BCU is optional if batteries are not used.
297-8361-550 Standard 04.01 September 2000
battery control unit (BCU)
environmental control unit (ECU)
rectifier system
cable-connecting compartment (end-access compartment)