This trap is sent upon detecting that MCMESC's BER high threshold is not exceeded. The source is a 4 or 5 tuple specifying the type, location, shelf, slot ID, and optionally the port number of the source of the event. The port number 1 to 12 is applicable to CPE ports, a NULL port number indicates the link. Each event has an unique event ID. It also has a preset event severity. The severity or trap type may be: critical, major, minor, or normal. For a given event severity, there is a corresponding system status, not necessarily the same as the event severity. For each reported trap, the IP address of the CP responsible for sending this trap is also included in the trap structure.