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Shelf Installation
Power Supply Redundancy
You can power the OCM shelf system with one power supply or with multiple redundant, load-
sharing power supplies in one shelf or in two adjacent, interconnected shelves (using associated bus
power cable) with up to two supplies per shelf. Each shelf is required to house at least one power
supply. Additional power supplies need to be installed when redundancy is required. A redundant
power supply system has at least one more installed power supply than is required for proper
operation. For example, if one power supply fails, the remaining power supplies can power the
installed cards. The installed power supplies actively shares current, dividing the total load among
all functional supplies.
Adding a second power supply in a shelf provides redundancy such that if one power supply fails,
the remaining power supply has the capacity to maintain power to that shelf. The second power
supply current shares with the first power supply with the benefit that both power supply modules
run cooler and therefore have a lower failure rate.
Station Battery
The dc-powered shelves require customer provided station battery power. Use No. 16 to 12 AWG
stranded, insulated copper wire for battery connections, sized to carry 3 amps at ñ48 V dc nominal
per shelf. See
When a single -48 VDC station battery is used, connect a short jumper wire to terminals 1 and 2,
and another to terminals 5 and 6. Connect the station battery positive side to terminal 3, and the
negative side to terminal 4. Be sure to observe polarity when you connect the leads to the station
battery.
When two batteries (redundant battery system) are used, disconnect jumpers (if any) on 1 and 2, and
5 and 6. Connect station battery A positive side to 3, and A negative side to 4. Battery B positive
side connects to 1 and its negative side connects to 6. Be sure to observe polarity when connecting
leads to station battery A and B.
2-14
Figure
2-8.
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
Shelf Installation
036R340-000
Issue 16
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