Issue 5 November 2000 
363-206-208
Equipment and Front Access Cable Installation for the DDM-2000 OC-12 Multiplexer
Lucent Technologies - Proprietary
See Notice on first page
(2) Remove the front and rear covers from the DDM-2000 OC-12 shelf.
NOTE:
The covers must be installed later to assure proper air flow for cooling and fan fil-
ter alarm sensing as well as for compliance with electromagnetic interference
(EMI) requirements.
(3) Inspect the DDM-2000 OC-12 shelf for visible damage including bent or touch-
ing backplane pins.
(4) Position the DDM-2000 OC-12 shelf side mounting brackets accordingly. Refer
to Figure 3-7 on page 3-52.
NOTE:
To ensure that the shelf is grounded through the bay frame, the mounting brack-
ets must be positioned so that the head of the mounting screw makes contact
with the unpainted surface of the bracket.
(5) Position the DDM-2000 OC-12 heat baffle and fan shelf side mounting brackets
accordingly. Refer to Figure 3-7 on page 3-52.
NOTE:
To ensure that the shelf is grounded through the bay frame, the mounting brack-
ets must be positioned so that the head of the mounting screws make contact
with the unpainted surface of the bracket.
(6) If this is a DDM-2000 OC-3/OC-12 combined bay application, position the
mounting brackets on the lightguide slack storage shelf such that the distance
between the mounting brackets and the front of the shelf is similar to that of the
DDM-2000 OC-12 shelf (that is, when mounted, the face of the slack storage
shelf should line up with the face of the DDM-2000 OC-12 shelf).
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