Issue 5 November 2000
363-206-208
Equipment and Rear Access Cabling for the DDM-2000 OC-12 Multiplexer
Lucent Technologies - Proprietary
See Notice on first page
NOTE:
The cables must be a minimum of 10 gauge for bay arrangements or 12 gauge
for a single shelf.
(6) Label the feeders at the BDFB BAT A, BAT A RTN, BAT B, and BAT B RTN.
NOTE:
Each feeder at the BDFB should be fused for at least 25 amperes for bay
arrangements and at least 15 amperes for a single shelf.
(7) Leave the BDFB fuses out or breakers off until you are ready to do the Power-
ing, Verification, and Circuit Pack Installation” section of this manual.
Office Alarm Cabling - Rear Access
Description
Office alarms are the common method used in a central office for maintenance
personnel to quickly isolate a failure to the correct system. Refer to the following
information if connection to the office alarm system is to be made.
The office alarm relay contacts are rated at 50 VA which means that they are
capable of switching 1 amp at 50 volts or 2 amps at 24 volts. Their ability to
switch large transient currents means that they can, if necessary, switch up to
ten 5-watt aisle pilot lamps.
If transient voltages or currents are above these limits, transient noise suppress-
ing devices such as diodes or contact protection networks must be used to keep
within the voltage and current limits. If these protection devices are not sufficient,
then an external buffer relay MUST be provided.
In all cases, and as a matter of good practice, suppression devices such as
diodes or contact protection networks must be provided across any external
relay coil being driven by the DDM-2000 OC-12 shelf to limit transient voltages
and currents.
Office alarm cable options are listed in Table 2-7 on page 2-40.
Office alarm connections are listed in Table 2-8 on page 2-41.
Office Alarm Cabling - Shelf 1
NOTE:
Office alarms are cabled to the bottom DDM-2000 OC-12 shelf in the bay. Office
alarms for the other DDM-2000 OC-12 shelves in the bay are daisy-chained up
the bay from the bottom shelf.
Summary of Contents for DDM-2000 OC-12
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