Cisco Catalyst 3000, Administration Manual

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When you see this LED, do
this: Meaning Color Name
Ensure that the PSTN
connection is secure and
configured correctly for the
service. MCS 7890-C1 detects
no carrier signal. None (LED is
off.) Connection T1 / E1 1
- MCS 7890-C1 detects
carrier signal. Green on
This is not an error
condition, but rather an
indication that the port has
been put in loopback mode
for maintenance. This port is in loopback
mode. Yellow
blinking
- MCS 7890-C1 detects
no alarms. None (LED is
off.) Alarm
This is due to a framing
error which reports an error
in the far end. Check the
connection between the far
end and the MCS 7890-C1. The device that is
sending the signal has
an error. Yellow
The result of an MCS
7890-C1 framing error.
Check the connection
between the MCS 7890-C1
and the far end. MCS 7890-C1 detects
an alarm. Red
Same as T1/E1 1 MCS 7890-C1 detects
no carrier signal. None (LED is
off.) Connection T1 / E1 2
- MCS 7890-C1 detects
carrier signal. Green on
Same as T1/E1 1 This port is in loopback
mode. Yellow
blinking
Same as T1/E1 1 MCS 7890-C1 detects
no alarms. None (LED is
off.) Alarm
- The device that is
sending the signal has
an error. Yellow
Same as T1/E1 1 MCS 7890-C1 detects
an alarm. Red
Troubleshooting Using the System LED
You, as a System Administrator, can also monitor the health of the Cisco Business Edition 3000 system
through the status of the System LED mounted on the MCS 7890 server. This LED gives you primary
Administration Guide for Cisco Business Edition 3000, Release 8.6(4)
OL-27022-01 415
Troubleshooting Using MCS 7890-C1 LEDs