363-206-305
Shelf Descriptions and Configurations
Issue 3 June 2000
3-7
pack. The auxiliary controller (AUXCTL) slot is reserved for the user panel
(USPNL) circuit packs.
The user panel (USPNL) is located at the far right side of the wideband shelf and
is equipped with the following:
■
Tw o
−
48 volt fuses (labeled FA and FB)
■
Four alarm LEDs
■
ACO/TEST pushbutton control
■
Five status LEDs
■
Craft interface terminal (CIT) port.
NOTE:
Damage that may occur to the shelf due to accidental insertion of
same-size circuit packs in incorrect slots is prevented through circuit
pack keying. Three keying combinations are provided. The key
mechanism is located on the faceplate latch with an interference
mechanism on the shelf.
The front of the wideband shelf is covered with an electromagnetic compatibility
(EMC) cover, as shown in Figure 3-9. If the shelf needs to be accessed for
maintenance activities, the cover is hinged to drop down 180 degrees. The cover
can also be removed by tapping the door in when it is open and held horizontally
outward, until the hinge pops out of the hinge plate. The hinge pin can then be
lifted up and the door removed.
The back of the wideband shelf is covered by an cover over the circuit pack slots
on the backplane and a cover over the protection bus. All covers are necessary to
meet the EMC guidelines set by the Federal Communications Commission (FCC).
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