Lucent Technologies SLC-2000 Access System Central Office Terminal, Инструкция по сборке

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363-208-010, Appendix 1
Dual Power Feed Unit Installation Procedure
Issue 1 November 1998 1-1
Lucent Technologies
1
NJ00675A-2 Dual Power Feed Unit
Installation Procedure
General
Scope
This appendix to the Customer Assembly Manual for RT Frames provides the
installation and test information to install the NJ00675A-2 Dual Power Feed Unit
(DPFU) on the J1C265A-1 Remote Terminal Bay.
Overview
Many systems utilize dual power feeds (-48VDC) from a Battery Distribution Fuse
Board (BDFB) or other source, usually designated “A” and “B”, to provide redun-
dant battery feeds. In practice, if one feeder goes down, many systems, including
SLC
®
-2000 Access System, are designed to lose partial, but not total, functional-
ity. An example would be a
SLC-2000 system, where the failure of one of the feed-
ers would remove power from four (4) of the eight (8) Metallic Distribution Shelves,
thereby causing a potential lost of service on up to 384 circuits (and more under
certain conditions). The DPFU is designed for applications where a partial loss of
functionality is unacceptable. The unit is designed to monitor the dual primary
feeds from the BDFB and will, if it senses a primary feeder failure, automatically
switch both secondary feeders to the remaining primary feeder, thereby keeping
the system fully operational. The unit also provides independent discreet alarm
indications and closures relating to the status of both primary feeders.
Reason for Reissue
Original issue.