Cisco IE-3000-8TC Administration Guide - Page 435
When you see this LED, do, Meaning, Color, Troubleshooting Using the System LED, Same as T1/E1 1
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Troubleshooting Using MCS 7890-C1 LEDs Name T1 / E1 1 T1 / E1 2 Connection Alarm Connection Alarm Color Meaning When you see this LED, do this: None (LED is MCS 7890-C1 detects off.) no carrier signal. Ensure that the PSTN connection is secure and configured correctly for the service. Green on MCS 7890-C1 detects carrier signal. Yellow blinking This port is in loopback This is not an error mode. condition, but rather an indication that the port has been put in loopback mode for maintenance. None (LED is MCS 7890-C1 detects - off.) no alarms. Yellow The device that is sending the signal has an error. 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. Red MCS 7890-C1 detects The result of an MCS an alarm. 7890-C1 framing error. Check the connection between the MCS 7890-C1 and the far end. None (LED is MCS 7890-C1 detects Same as T1/E1 1 off.) no carrier signal. Green on MCS 7890-C1 detects carrier signal. Yellow blinking This port is in loopback Same as T1/E1 1 mode. None (LED is MCS 7890-C1 detects Same as T1/E1 1 off.) no alarms. Yellow The device that is - sending the signal has an error. Red MCS 7890-C1 detects Same as T1/E1 1 an alarm. 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 OL-27022-01 Administration Guide for Cisco Business Edition 3000, Release 8.6(4) 415