Cisco ONS 15454 SDH Specifications download pdf (Page 339)

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

May 2002

Chapter 8 SDH Performance Monitoring

SDH Performance Monitoring for Optical Cards

Table 8-26 Protection Switch Count PMs for the STM-4 Card, 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 (MS-SPRing)

For a protect line in a 2-fiber ring, Multiplex Section Protection Switching

Count (MS-PSC) refers to the number of times a protection switch has

occurred either to a particular span’s line protection or away from a

particular span’s line protection. Therefore, if a protection switch occurs

on a 2-fiber MS-SPRing, the MS-PSC of the protection span to which the

traffic is switched will increment, and when the switched traffic returns to

its original working span from the protect span, the MS-PSC of the protect

span will increment again.

Note 4-fiber MS-SPRing is not supported on the STM-4 card; therefore,

the MS-PSC-S, and MS-PSC-R PMs do not increment.

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.

MS-PSD

For an active protection line in a 2-fiber MS-SPRing, Multiplex Section

Protection Switching Duration (MS-PSD) is a count of the number of

seconds that the protect line is carrying working traffic following the

failure of the working line. MS-PSD increments on the active protect line

and MS-PSD-W increments on the failed working line.

Note 4-fiber MS-SPRing is not supported on the STM-4 card; therefore,

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

MS-PSC-W

For a working line in a 2-fiber MS-SPRing, Multiplex Section Protection

Switching Count-Working (MS-PSC-W) is a count of the number of times

traffic switches away from the working capacity in the failed line and back

to the working capacity after the failure is cleared. PSC-W increments on

the failed working line and PSC increments on the active protect line.

MS-PSD-W

For a working line in a 2-fiber MS-SPRing, Multiplex Section Protection

Switching Duration-Working (MS-PSD-W) is a count of the number of

seconds that service was carried on the protection line. MS-PSD-W

increments on the failed working line and PSD increments on the active

protect line.

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