3Com 3C63311 Reference Guide - Page 183

Managing System Alarms 171 DS1/E1 UNI Module Alarms Table 28 describes the alarms specific to the DS1 UNI and E1 UNI modules. ATM Forum required alarms are indicated by the notation ATM Forum (R-xxx), where xxx is the required alarm number. Table 28 DS1/E1 UNI Module Alarms Alarm AFA Link Removal Bad IMA ID Bad Link ID Bad M Bad Offset (continued) Meaning Troubleshooting Steps Automatic Frequency Adjustment - Link removed from physical line group due to error rate in CRC check of T1/E1 exceeding user specified rate for a given period of time. Check the removed link for the CRC errors. A link within the group has received an IMA ID from the far end that is different than when the group was initialized (and from the other links in the group). The link with the bad IMA ID is probably misconnected. Check the links for proper connection. Reconnect if necessary. Each IMA group assigns a unique Transmit link ID to each link in the group. This link ID should match the Receive link ID of the remote end IMA device. This alarm means that a link was operating correctly, but then received a Transmit link ID already assigned to a previous link. Check the links for proper connection. Reconnect if necessary. A Tx Misconnected alarm is also generated. The far end frame size M has changed in an IMA link. The maximum value for the frame size on the local device's serial card must match the maximum value for the frame size of the connected device. The link with the BAD M is probably misconnected. Check to make sure the maximum frame size is set to the same value on the local and remote ends. Far end ICP cell offset has changed in an IMA link. Check the links for proper connection. Reconnect if necessary. Each IMA group assigns a unique Transmit offset to each link in the group. This alarm means that a link was operating correctly, but then received a Transmit offset already assigned to a previous link. A Tx Misconnected alarm is also generated.