Issue 3 June 2001 3-1
3
Shelf Descriptions and
Configurations 3
Overview 3
This section provides the physical description of the DDM-2000 OC-3 Multiplexer
shelf and illustrates typical shelf equipage for different configurations. In addition,
this section provides a physical description of the DDM-2000 Fan Shelf.
DDM-2000 OC-3 Multiplexer Shelf 3
The DDM-2000 OC-3 Multiplexer is shown in Figure 3-1 and Figure 3-2.
Figure 3-1 is the Group 4 Shelf. This shelf measures 8.5 inches high by 21.25
inches wide by 13.25 inches deep and fits in a standard 23-inch wide bay. The
Group 1 or Group 3 shelf measures 8.5 inches high by 21.25 inches wide by 12
inches deep and fits in a standard 23-inch wide bay. User panels are
interchangeable between shelves (old in the new or new in the old). Each shelf is
a stand-alone entity with its own fiber cabling and interfaces to DSX-1, DSX-3,
STSX-1 office power, and operations interfaces. Cabling for office alarms, craft
interface terminal (CIT) interfaces, and DS1 timing inputs can be shared among
shelves in a bay. The default configuration provides rear access cabling. Front
access through dangler cables is available as an option. Front-access optical
connectors interconnect to optical fiber facilities and facilitate shelf loopback and
fiber tests. The optical connectors are mounted on the optical line interface unit
(OLIU) circuit pack faceplate.
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