The circuit status can be tracked to be either up, loss of packets, or administratively down. Statistics are available for the number of in-service seconds and the number of out-of-service seconds when the circuit is administratively up.
Jitter buffer overrun and underrun counters are available by statistics and optionally logged while the circuit is up. On overruns, excess packets are discarded and counted. On underruns, all ones are sent for unstructured circuits. For structured circuits, all ones or a user-defined data pattern is sent based on configuration. Also, if CAS is enabled, all ones or a user-defined signaling pattern is sent based on configuration.
For each CES circuit, alarms can be optionally disabled/enabled for stray packets, malformed packets, packet loss, receive buffer overrun, and remote packet loss. An alarm is raised if the defect persists for 3 seconds, and cleared when the defect no longer persists for 10 seconds. These alarms are logged and trapped when enabled.