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Circuit Pack Descriptions
Issue 1 December 1997 7-37
Power Circuitry 7
The BBG11B 3DS3 circuit pack receives two sources of −48 volts that are in turn
diode ORed, fused, and filtered before conversion to +5 volts to power the rest of
the circuit pack. A failure of the fuse or converter causes the red FAULT LED to
light.
BBG11B 3DS3 Hardware Settings 7
The location of the BBG11B 3DS3 circuit pack LBO jumpers is shown in
Figure 7-15. The 3DS3 LBO settings are shown in the table.
Figure 7-15. 3DS3 Line Build-Out Jumpers
3DS3 LBO Settings
Cable Length (Ft) LBO Setting
734A
Cable
Mini-Coax
KS-19224
735A
Cable
0 to 225
>225 to 450
0 to 75
>75 to 150
0 to 125
>125 to 250
LBO IN
LBO OUT
# 2
# 1
Component Side
# 3
LBO OUT
LBO IN
Connector
Edge
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