Cisco ONS 15454 SDH Specifications download pdf (Page 334)

8-30

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 8 SDH Performance Monitoring

SDH Performance Monitoring for Optical Cards

Table 8-19 Multiplex Section PMs for the STM-1 Card, Near-End and Far-End

Parameter Definition

MS-EB

Multiplex Section Errored Block (MS-EB) indicates 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 >

X% 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 8-20 1+1 LMSP Protection Switch Count PMs for the STM-1 Cards, Near-End

Parameter Definition

For information about Troubleshooting SNCP switch counts, see the alarm troubleshooting

information in the Cisco ONS 15454 SDH Troubleshooting and Reference Guide. For information

about creating circuits that perform a switch, see Chapter 6, “Circuits and Tunnels.”

MS-PSC (1+1 protection)

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.

Note MS-SPRing is not supported on the STM-1 card; therefore, the

MS-PSD-W, MS-PSD-S, and MS-PSD-R PMs do not increment.

MS-PSD

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.

Note MS-SPRing is not supported on the STM-1 card; therefore, the

MS-PSD-W, MS-PSD-S, and MS-PSD-R PMs do not increment.

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