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Connecting the Control Unit to the Network Interface
Table 4-24. Signal Monitor Unit Front-Panel LEDs
Label
Avg. Dens
Color
Red
When Lit Indicates
Low average ones density
Zeroes
Red
Line Pwr
Yellow
> 50 consecutive zeroes (needed
for encryption) or > 16 consecutive
zeroes (option switch S4 closed)
Presence of simplex current
Looped
Yellow
Loopback function activated
BPV
Red
Bipolar violations received
Pulse
Green
Normal 1.544-Mbps pulses present
Table 4-25. Signal Monitor Unit Front-Panel Test Jacks
Jack
Provides
EQ (IN-OUT-MON)
Access to transmit input
and receive output of the
100D module
SM (lN-OUT-MON)
Access to CSU transmit
input and receive output
Installing the Channel Service Unit
4-39