The show controller e1 command displays the controller status specific to the controller hardware. This information is useful for diagnostic tasks performed by technical support personnel. The Network Processor Module (NPM) or MultiChannel Interface Processor (MIP) can query the port adapters to determine their current status.
The show controller e1 EXEC command also provides the following:
Statistics about the E1 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 E1 line.
Use the show controller command to see if there are alarms or errors displayed by the controller. To see if the framing, line coding, and slip seconds error counters are increasing, use the show controller e1 command repeatedly. Note the values of the counters for the current interval.
Contact your Service Provider for framing and line coding settings. HDB3 is the only defined line code for E1 lines, while CRC4 framing is most widely used.