# Cisco ONS 15454 SDH User Manual

## Page 6

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**15-6**

**Cisco ONS 15454 SDH Reference Manual, R4.6**

**April 2008**

**Chapter 15 Performance Monitoring**

**15.4.1 E1-N-14 Card and E1-42 Card Performance Monitoring Parameters**

E1 (Tx or Rx) P-AISS

AIS Seconds Path (P-AISS) is a count of one-second intervals containing

one or more AIS defects.

E1 (Tx or Rx) P-ESR

Path Errored Second Ratio (P-ESR) is the ratio of errored seconds to total

seconds in available time during a fixed measurement interval.

E1 (Tx or Rx) P-SESR

Path Severely Errored Second Ratio (P-SESR) is the ratio of SES to total

seconds in available time during a fixed measurement interval.

E1 (Tx or Rx) P-BBER

Path Background Block Error Ratio (P-BBER) is the ratio of BBE to total

blocks in available time during a fixed measurement interval. The count

of total blocks excludes all blocks during SESs.

**Table 15-4 VC-12 Low-Order Path PM Parameters for the Near-End and Far-End E1-N-14 Cards **

**and E1-42 Cards**

**Parameter**

**Definition**

LP-EB

Low-Order Path Errored Block (LP-EB) indicates that one or more bits

are in error within a block.

LP-ES

Low-Order Path Errored Second (LP-ES) is a one-second period with one

or more errored blocks or at least one defect.

LP-SES

Low-Order Path Severely Errored Seconds (LP-SES) is a one-second

period containing greater than or equal to 30 percent errored blocks or at

least one defect. SES is a subset of ES.

LP-UAS

Low-Order Path Unavailable Seconds (LP-UAS) is a count of the seconds

when the VC path was unavailable. A low-order path becomes unavailable

when ten consecutive seconds occur that qualify as LP-SESs, and it

continues to be unavailable until ten consecutive seconds occur that do not

qualify as LP-SESs.

LP-BBE

Low-Order Path Background Block Error (LP-BBE) is an errored block

not occurring as part of an SES.

LP-ESR

Low-Order Path Errored Second Ratio (LP-ESR) is the ratio of errored

seconds to total seconds in available time during a fixed measurement

interval.

LP-SESR

Low-Order Path Severely Errored Second Ratio (LP-SESR) is the ratio of

SES to total seconds in available time during a fixed measurement

interval.

LP-BBER

Low-Order Path Background Block Error Ratio (LP-BBER) is the ratio of

BBE to total blocks in available time during a fixed measurement interval.

The count of total blocks excludes all blocks during SESs.

**Table 15-3 Transmit and Receive CEPT and CRC4 Framing Path PM Parameters **

**for the Near-End and Far-End E1-N-14 Cards and E1-42 Cards (continued)**

**Parameter**

**Definition**