363-206-285
Shelf Descriptions and Configurations
3-26 Issue 3 June 2001
The fan shelf is only required in DDM-2000 OC-3 non-Network Equipment
Building Standards (NEBS) environments (direct air inlet temperatures exceeding
50° C). The fan shelf is not required in DDM-2000 OC-3 controlled environment
applications. All applications should be equipped with a heat baffle as shown in
ED-8C724-10 for the DDM-2000 OC-3 Multiplexer.
One DDM-2000 Fan Shelf can cool two DDM-2000 OC-3 shelves.
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 four-part switch to the
left of center on the front of the shelf are visible (see Figure 3-17). The switches
should be set as shown in Table 3-3.
Figure 3-17. DDM-2000 Fan Shelf — Fan Switches — Front Cover Removed
4321
OFF
ON
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