The failure is cleared if the Yellow alarm signal pattern does not occur in ten contiguous 16-bit signal pattern intervals. The Far End Alarm failure is not declared for SF links when a Loss of Signal is detected.įor ESF links, the Far End Alarm failure is declared if the Yellow alarm signal pattern occurs in at least seven out of ten contiguous 16-bit pattern intervals.
The failure is cleared when bit 6 of at least one channel is not zero for a period usually less than one second and always less than five seconds.
To correct Rx AIS errors, complete the following steps: The AIS failure is cleared when the Loss Of Frame failure is cleared. The AIS failure is declared when an AIS defect is detected at the input and still exists after the Loss Of Frame failure is declared (caused by the unframed nature of the “all-ones” signal). After each step, run the show controller t1 command to see if any alarms occur.Ī receive (Rx) alarm indication signal (AIS) means there is an alarm occurring on the line upstream from the equipment that is connected to the port. The alarms and procedures to correct them are addressed in this section. 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. CCIE Voice Certification to CCIE Collaboration Certification update.CCIE Collaboration Lab Equipment and Software List.CCIE Voice Evolves to CCIE Collaboration.
T1 loopback cable update#