Troubleshooting guide

Section 1, System Description - System Components
61186003L1-1D 1-15
STS-1 MUX Front Panel LEDs
Table 1-4 provides a description of the front panel LEDs.
Table 1-4. MX2820 STS-1 MUX Front Panel LEDs
LED State Description
LED Status for Active MUX
ACT
Green
Alternating Green/Amber
Red
Amber
Alternating Red/Amber
Flashing Red
Normal (all OK)
Normal and console open
Self-test failed
Software update in progress
Software update in progress and console open
STS-1 MUX Module has failed
ALM
Green
Red
Flashing Red
No critical, major, or minor alarms
Major or minor alarm in progress
Critical alarm in progress
NET STAT
Green
Red
Flashing Red
Red (Flashing 1 sec per
event)
Normal (STS-1 OK)
AIS or LOF alarm
STS-1 LOS, LOP, or STS-1 failure (critical)
Single/Burst STS-1 code violations
NET TEST
Off
Amber
No STS-1 tests in progress
In test (locally originated)
DS1 STAT
Off
Green
Red
Flashing Red
Red (Flashing 1 sec per
event)
Alternating Red/Green
All DS1s are disabled
Enabled DS1s normal (all OK)
Noncritical DS1 alarm (CAIS, LAIS)
LOS on an enabled line (critical DS1 alarm; noncritical
system alarm)
Single/Burst RX DS1 code violation
DS1 XCV threshold exceeded
DS1 TEST
Off
Amber
Amber (Flashing)
No DS1 tests in progress
In test (locally originated)
In test (remotely originated)