Issue 1
December 1997
3-1
3
Shelf Descriptions and
Configurations
3
Overview
3
This section provides the physical description of the DDM-2000 OC-12 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-12 Multiplexer Shelf
3
The DDM-2000 OC-12 Multiplexer is shown in Figure 3-1 and Figure 3-2.
Figure 3-1 is the new Group 4 shelf. The Group 4 shelf measures 14 inches high
by 21.25 inches wide by 13.25 inches deep and fits in a standard 23-inch wide
bay. The Group 4 shelf replaces the Group 1 shelf for new applications (or existing
applications). When using the G4 shelf with the alternative isolated grounding
scheme, the BBG8B SYSCTL is required. The G4 shelf may be used with a
traditional grounding scheme with any system controller circuit pack.
The Group 1 shelf measures 14 inches high by 21.25 inches wide by 12 inches
deep and fits in a standard 23-inch wide bay. User panels are not interchangeable
between shelves (old in the new or new in the old). If desired, a G1 shelf can be
upgraded to provide the deeper front cover offered with the G4 shelf by ordering
the Front Cover Upgrade Kit, comcode #847554185.
