Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Control Unit Problems
Page 4-106
100D Module Problems
Figure 4-8. 551 T1 CSU Loopback Connection
Figure 4-9. ESF T1 CSU DTE Loopback Connection
Office Repeater
.18A
+ Line
.18A
-Line
Line
In
XMT
Out
XMT
Mon
RCV
Out
XMT
In
RCV
Mon
-V Reg
+-1
Signal Monitor Unit
EQ
In
EQ
OUT
SM
IN
SM
Mon
EQ
Mon
SM
Out
Equipment
Signal
Central Line
Signal
Avg
Dens Zeros
Line
Pwr Looped BPV Pulse
551 T1 Channel Service Unit
UP UP/DN
AOO
Eq Eq SM SM
-1 +1
ESF T1 CSU
IN OUT IN OUTMON MON
DTE LOOPBACK
SEND CODE
ALARM
FAR END LOOPED
CRITICAL POWER
PULSES
FRAME LOSS
CRC ERROR
BPV
NEAR END LOOPED
DIAGNOSTIC

INTERFACE
FRAME

LOSS
LOW DENS
LOOPED
LOCAL

POWER