Description: Definitions:

missingPkt - While playing out a sequence of packets, a packet(s) was determined to be missing based on a gap in the CEP sequence number. Note: If the implementation supports packet re-ordering, detecting gaps should not take place as packets arrive, only as they are played out - this gives time for mis-ordered packets to arrive late.

ooRngDropped - Packet(s) arrives that is outside the range of the jitter buffer. This may be because the jitter buffer is full, or the sequence number addresses a buffer outside the current jitter buffer range, or addresses an already occupied buffer within range. Whether or not packet re-ordering is supported by the implementation, this indication MUST be supported.

jtrBfrUnder - The jitter buffer underflowed due to not enough packets arriving as packets were being

played out.

pktBadLength - Non-bandwidth-saving packet arrives larger or smaller than pwVcCepCfgSonetPayloadLength, or when a fractional SPE packet length does not match the extension header or manual configuration indicating the number of equipped VTs.

lops - Loss Of Packet Sync. See draft-ietf-pwe3-sonet.

cepRdi - Circuit Emulation over Packet Remote Defect Indication. Generated by the remote CEP de-packetizer when detecting LOPS. Note: not generated by the remote SONET function. See draft-ietf-pwe3-sonet.

cepAis - Remote CEP packetizer has detected AIS on its incoming SONET stream. See draft-ietf-pwe3- sonet. Note: cepAis MUST NOT (in itself) cause a CEP down notification. This would be a layer violation.

badHdrStack - This indication is set when the number of CEP header extensions detected in incoming packets does not match the expected number.

Note: currently there is no hierarchy of CEP defects.

Note: the algorithm used to capture these indications is implementation specific.