363-206-295
Shelf Descriptions and Configurations
Issue 1 December 1997 3-19
The fan shelf is required in all DDM-2000 OC-12 Multiplexer applications in a
controlled environment. The fan shelf is not required in OC-12 Regenerator
applications. All applications should be equipped with a heat baffle as shown in
ED-8C727-10 for the DDM-2000 OC-12 Multiplexer and OC-12 Regenerator
shelves.
A DDM-2000 Fan Shelf is required for each DDM-2000 OC-12 shelf.
The fan shelf is 3.9 inches high by 9.3 inches deep by 21.2 inches wide and
weighs 25 pounds. Mounting brackets can be attached in three positions to
accommodate both front and rear access installations in different bay frames. The
fan shelf is fully accessible from the front for service and maintenance.
When the front cover is removed, the four fan units and a 4-part switch to the left
of center on the front of the shelf are visible (see Figure 3-14). The switches
should be set as shown in Table 3-3.
Figure 3-14. DDM-2000 Fan Shelf — Fan Switches — Front Cover Removed
4321
OFF
ON
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