Extreme Networks BlackDiamond 6800 Installation And User Manual page 64

Configuring the ATM Module
Table 3-6: SONET Events (continued)
Event
Loss of Frame (LOF)
Loss of Pointer (LOP)
Alarm Indication
Signal—Line (AIS-L)
Alarm Indication
Signal—Path (AIS-P)
Remote Defect
Indicator—Line (RDI-L)
Remote Defect
Indicator—Path (RDI-P)
Remote Error
Indicator—Line (REI-L)
Remote Error
Indicator—Path (REI-P)
3-22
Description
Loss of Frame is detected by the STE when a Severely Errored
Framing (SEF) defect on the incoming signal persists for 3
milliseconds.
Related SONET Overhead: A1, A2 (framing pattern).
SONET Action: Send RDI-L upon LOF detection.
The Path Loss Of Pointer event is detected as a result of excess
New Data Flags (NDFs) or invalid pointers in the H1/H2 fields of the
received signal.
Related SONET Overhead: H1,H2 contain NDF and pointer.
SONET Action: Send RDI-P upon LOP detection.
The Line Alarm Indication Signal is sent by the upstream STE to
inform the LTE that a LOS or LOF defect has been detected.
Extreme's SONET module never sends AIS-L. AIS-L was formerly
known as Line Far End Receive Failure (FERF).
Related SONET Overhead: K2 carries AIS-L.
SONET Action: Send RDI-L upon reception of AIS-L.
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.
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.
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.
The Line Remote Error Indicator conveys a count of detected B2
parity errors from the peer LTE.
Related SONET Overhead: M1 carries REI-L.
The Path Remote Error Indicator conveys a count of detected B3
parity errors from the peer PTE.
Related SONET Overhead: G1 carries REI-P.
Asynchronous Transfer Mode (ATM) Module Installation and User Guide