Csu Front Panel Leds - AT&T MERLIN LEGEND Installation & Maintenance Manual

Installation
Table 3-17 CSU Front Panel LEDs
LED
LOCAL
POWER
Network
Side
FAR END
LOOPED
CRITICAL
PWR
PULSES
FRAME
LOSS
CRC
ERROR
BPV
NEAR END
LOOPED
ALARM
Color
Local 117 VAC or -48 VDC is
Yellow
ON
Far-end CSU looped if
Red
initiated by near-end CSU
Power is on to critical
Yellow
circuits
Normal incoming signal from
Green
network
Loss of signal, loss of frame
Red
synch, improper frame
sequence, or unframed
signal
CRC error detected
Red
Non-B8ZS violation detected
Red
when optioned for B8ZS;
other bipolar violations
detected
Loopback is activated
Yellow
BER threshold exceeded
Red
(associated contacts for an
audible alarm are also
activated)
When Lit Indicates
Channel Service Unit 3-35