363-206-295
Shelf Descriptions and Configurations
Issue 1 December 1997 3-7
DDM-2000 OC-12 Multiplexer Shelf
Configurations 3
A DDM-2000 OC-12 Multiplexer path switched ring shelf supports all OC-12 ring
applications.
■ The following circuit packs are required in all DDM-2000 OC-12 Multiplexer
path switched ring applications:
— 177C APPBLK in the main A slots to control air flow through the
shelf to ensure adequate cooling.
— 23G/23G-U or 23H/23H-U OLIU circuit packs in the main B slots
provide the OC-12 optical interfaces.
— BCP3 TSI circuit packs in the TSI slots connect STS-1s from the
main B slots to the FN slots. The BCP3 TSI also distributes the
timing it receives from the BBF2B/BBF4 TGS/TG3 circuit packs to
circuit packs in the main and FN slots.
— BBF2B/BBF4 TGS/TG3 circuit packs in the TIMING slots provide
timing to the BCP3 TSI circuit packs.
— BBG8 SYSCTL and BCP4 OHCTL circuit packs in the SYSCTL and
AUXCTL slots, respectively, provide system control functions.
■ For all but the SYSCTL and OHCTL, which are not protected, installation of
protection circuit packs is optional. Equipage of function unit slots depends
on the application.
■ Unused FN slots must be equipped with 177B APPBLK to ensure
adequate cooling of the shelf.
■ All applications should be equipped with a baffle as shown in
ED-8C727-10.
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