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5
Fuses and Alarm Panel
5.1 Fuse and Alarm Panels
The Fuse and Alarm Panel (FAP) provides protected distribution of –48VDC power to the
shelves in the frame. The site voltage input to each frame should be between -40VDC and
-57.5VDC. Allowing for the full population of a frame and for the failure of one primary supply,
new installations of Control and Extension frames require two 60A feeds. See the "Hardware
Power Calculator Tool" section in Hardware for more information.
The FAP is installed at the top of the frame and uses two cables to bring A and B power to
the frame. The FAP contains two separate circuits, A and B. Current flows from the input
terminals to the fuse bus. Protection is provided by fuses placed in fuse holders on the front
panel. When a fuse is installed in a fuse holder, the circuit is completed to the output
connector.
warning:
Existing frames that are fused at 40 amps may be upgraded to support 60 amps
with a FAP upgrade kit. Frames that contain HC-MIMs must be upgraded to support
60 amps. Customers do not perform a FAP upgrade; these upgrades are performed
by Oracle Communications personnel.
warning:
The FAP P/N 870-1606-02 Revs A-B can be upgraded to FAP P/N 870-1606-02
Rev C with FAP upgrade kit P/N 840-0139-01. The FAP P/N 870-2320-01 Revs A-I
can be upgraded to FAP P/N 870-2320-01 Rev J with FAP upgrade kit P/N
870-0139-02.
Caution:
All personnel associated with the installation of this system must adhere to all safety
precautions and protection equipment required to avoid the possibility of injury to
personnel, service degradation, and/or service interruption.
Caution:
This is a redundant system to allow service during normal maintenance. When
repairs require a total power disconnect, both input supply sources must be
disconnected. This will cause service interruption and take down the system.
5-1
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