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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.