Look for Clock Source is Line Primary in the show controller t1 output to verify that the clock source is derived from the network. It is common to use binary 8-zero substitution (B8ZS) line coding with Extended Superframe (ESF), and alternate mark inversion (AMI) line coding with Super Frame (SF). Note the values of the counters for the current interval.Ĭontact your Service Provider for framing and line coding settings. To see if the framing, line coding, and slip seconds error counters are increasing, execute the show controller t1 command repeatedly. Use the show controller command to see if there are alarms or errors displayed by the controller. Local or remote alarm information, if any, on the T1 line. Information to troubleshoot physical layer and data link layer problems. If you specify a slot and a port number, statistics for each 15 minute period are displayed. The show controller t1 EXEC command also provides the following: The Network Processor Module (NPM) or MultiChannel Interface Processor (MIP) can query the port adapters to determine their current status. This information is useful for diagnostic tasks performed by technical support personnel. The show controller t1 command displays the controller status specific to the controller hardware.

Conventionsįor more information on document conventions, see the Cisco Technical Tips Conventions. This document is not restricted to specific software and hardware versions.

There are no specific requirements for this document. Use this document in conjunction with the T1 Error Events Troubleshooting and the Internetwork Troubleshooting Guide.įor more information on the terms used in this document refer to the DS1, T1 and E1 Glossary Prerequisites Requirements An explanation of the alarm and common troubleshooting techniques are provided. This document explains common alarm types that may appear during T1 operation.

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