Table 4-24. Signal Monitor Unit Front-Panel Leds; Table 4-25. Signal Monitor Unit Front-Panel Test Jacks - AT&T MERLIN LEGEND Release 2.0 Installation Section

Connecting the Control Unit to the Network Interface

Table 4-24. Signal Monitor Unit Front-Panel LEDs

Label Color
Avg. Dens Red
Red
Zeroes
Yellow
Line Pwr
Yellow
Looped
BPV Red
Pulse Green

Table 4-25. Signal Monitor Unit Front-Panel Test Jacks

J a c k
EQ (IN-OUT-MON)
SM (lN-OUT-MON)
When Lit Indicates
Low average ones density
> 50 consecutive zeroes (needed
for encryption) or > 16 consecutive
zeroes (option switch S4 closed)
Presence of simplex current
Loopback function activated
Bipolar violations received
Normal 1.544-Mbps pulses present
Provides
Access to transmit input
and receive output of the
100D module
Access to CSU transmit
input and receive output
Installing the Channel Service Unit
4-39