User guide

3-20 Packet Over SONET Module Installation and User Guide
Configuring the PoS Module
Alarm Indication
Signal—Path (AIS-P)
The Path Alarm Indication Signal is sent by the upstream LTE to
inform the PTE that a LOS, LOF, AIS-L, or LOP defect has been
detected. Extreme's SONET module never sends AIS-P. AIS-P was
formerly known as Path Far End Receive Failure (FERF).
Related SONET Overhead: H1,H2,H3 = 0 when indicating AIS-P.
SONET Action: Send RDI-P upon receiving AIS-P.
Remote Defect
Indicator—Line (RDI-L)
The Line Remote Defect Indication is sent by the downstream LTE
when a LOS, LOF, or AIS-L defect is detected.
Related SONET Overhead: K2 carries RDI-L.
Remote Defect
Indicator—Path (RDI-P)
The Path Remote Defect Indication is sent by the downstream PTE
when a LOP or AIS-P defect is detected.
Related SONET Overhead: G1 carries RDI-P.
Remote Error
Indicator—Line (REI-L)
The Line Remote Error Indicator conveys a count of detected B2
parity errors from the peer LTE.
Related SONET Overhead: M1 carries REI-L.
Remote Error
Indicator—Path (REI-P)
The Path Remote Error Indicator conveys a count of detected B3
parity errors from the peer PTE.
Related SONET Overhead: G1 carries REI-P.
Path Payload Label
Mismatch (PLM-P)
The Path Payload Label Mismatch event occurs when the received
payload type does not match the expected payload. This event is
commonly caused by a Signal Label or scrambling mode mismatch
configuration error.
Related SONET Overhead: C2 carries the Signal Label.
Signal Failure Bit Error
Rate (SF BER)
The Signal Failure BER event occurs when the B2 bit error rate
exceeds the configured SF threshold. This event is used for APS
switching.
Related SONET Overhead: B2 carries line parity.
SONET Action: Send RDI-L upon detecting SF BER event.
Signal Degrade Bit Error
Rate (SD BER)
The Signal Degrade BER event occurs when the B2 bit error rate
exceeds the configured SD threshold. This event is used for APS
switching.
Related SONET Overhead: B2 carries line parity.
Table 3-4: SONET Events (continued)
Event Description