Cisco ONS 15454 SDH User Manual

Page 23

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15-23

Cisco ONS 15454 SDH Reference Manual, R4.6

April 2008

Chapter 15 Performance Monitoring

15.6.1 STM-1 Cards Performance Monitoring Parameters

Table 15-24 Multiplex Section PM Parameters for the Near-End and Far-End STM-1 and STM1 SH

1310-8 Cards

Parameter

Definition

MS-EB

Multiplex Section Errored Block (MS-EB) indicates that one or more bits
are in error within a block.

MS-BBE

Multiplex Section Background Block Error (MS-BBE) is an errored block
not occurring as part of an SES.

MS-ES

Multiplex Section Errored Second (MS-ES) is a one-second period with
one or more errored blocks or at least one defect.

MS-SES

Multiplex Section Severely Errored Second (MS-SES) is a one-second
period which contains 30 percent or more errored blocks or at least one
defect. SES is a subset of ES. For more information, see ITU-T G.829
Section 5.1.3.

MS-UAS

Multiplex Section Unavailable Seconds (MS-UAS) is a count of the
seconds when the section was unavailable. A section becomes unavailable
when ten consecutive seconds occur that qualify as MS-SESs, and it
continues to be unavailable until ten consecutive seconds occur that do not
qualify as MS-SESs. When the condition is entered, MS-SESs decrement
and then count toward MS-UAS.

Table 15-25 1+1 LMSP Protection Switch Count PM Parameters for the Near-End STM-1

and STM1 SH 1310-8 Cards

Parameter

Definition

Note

For information about troubleshooting subnetwork connection protection (SNCP) switch
counts, refer to the alarm troubleshooting information in the Cisco ONS 15454 SDH
Troubleshooting Guide
. For information about creating circuits that perform a switch, see

Chapter 10, “Circuits and Tunnels.”

MS-PSC

1

(1+1 protection)

1.

Multiplex section-shared protection ring (MS-SPRing) is not supported on the STM-1 card and STM-1E card; therefore, the
MS-PSD-W, MS-PSD-S, and MS-PSD-R PM parameters do not increment.

In a 1+1 protection scheme for a working card, Multiplex Section
Protection Switching Count (MS-PSC) is a count of the number of times
service switches from a working card to a protection card plus the number
of times service switches back to the working card.

For a protection card, MS-PSC is a count of the number of times service
switches to a working card from a protection card plus the number of
times service switches back to the protection card. The MS-PSC PM is
only applicable if revertive line-level protection switching is used.

MS-PSD

1

Multiplex Section Protection Switching Duration (MS-PSD) applies to
the length of time, in seconds, that service is carried on another line. For
a working line, MS-PSD is a count of the number of seconds that service
was carried on the protection line.

For the protection line, MS-PSD is a count of the seconds that the line was
used to carry service. The MS-PSD PM is only applicable if revertive
line-level protection switching is used.

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