T1 Alarm Troubleshooting - cisco.com

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a. Reconnect the T1 line to the original port. Perform a hardware loop test. For more information, see the Hard Plug Loopback Tests for T1/56 K Lines document. b. 6. Transmit Sending Remote Alarm (Red) A Red alarm is declared when the channel service unit (CSU) cannot synchronize with the framing pattern on the T1 line.

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T1 Alarm Troubleshooting - cisco.com T1 Alarm Troubleshooting - cisco.com
a. Reconnect the T1 line to the original port. Perform a hardware loop test. For more information, see the Hard Plug Loopback Tests for T1/56 K Lines document. b. 6. Transmit Sending Remote Alarm (Red) A Red alarm is declared when the channel service unit (CSU) cannot synchronize with the framing pattern on the T1 line.
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Use the debug isdn q921 Command This debug command is useful when you troubleshoot ISDN Layer 2 signaling problems. The debug isdn q921 command displays data link layer (Layer 2) access procedures that occur at the router on the D−channel. This can indicate whether the problem lies with the NAS, the Telco switch or the line.
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Statistics about the T1 link. If you specify a slot and a port number, statistics for each 15 minute period are displayed. Information to troubleshoot physical layer and data link layer problems. Local or remote alarm information, if any, on the T1 line. Most T1 errors are caused by incorrectly configured lines.
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