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.
To Next Page
Loading...