Performance Monitoring
150-359-100-01, Revision 01
38
October 27, 2000
HXU-359 List 1
Table 12.
STS-1 Error Definitions—Line Layer PM
Error Type
Description
ES-L
Errored Seconds—a count of the seconds during which at least one line layer
Bit-interleaved Parity (BIP) was detected or an AIS defect (or a lower-layer,
traffic-related, near-end defect) was present.
SES-L
Severely Errored Seconds—a count of the seconds during which 51 or more
line layer BIP errors were detected or an AIS defect (or lower-layer,
traffic-related, near-end defect) was present.
UAS-L
Unavailable Seconds—a count of the seconds during which the line was
considered unavailable.
CV-L
Code Violation—the count of BIP errors detected at the line layer (for
example, using B2 bytes in the incoming SONET signal). Up to 8 BIP errors
can be detected per STS-1 frame, with each error incrementing the CV line
current second register.
Table 13.
STS-1 Error Definitions—Path Layer PM
Error Type
Description
ES-P
Errored Seconds—a count of the seconds during which at least one STS path
layer BIP error was detected or an AIS-P defect was present.
SES-P
Severely Errored Seconds—a count of the seconds during which 2400 or
more STS-1 path layer BIP errors were detected or an AIS-P defect was
present.
UAS-P
Unavailable Seconds—a count of the seconds during which the STS-1 path
was considered unavailable.
CV-P
Code Violation—the count of BIP errors detected at the STS path layer (for
example, using B3 bytes in the incoming SONET signal). Up to 8 BIP errors
can be detected per STS-1 frame, with each error incrementing the CV line
current second register.
