Cisco ONS 15454 SDH Specifications Page 215

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4-17
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 4 Maintenance
Span Upgrade
STM-4 to STM-64
STM-16 to STM-64
When a span is upgraded, the higher-rate line card must replace the lower-rate card in the same slot. If
the spans to be upgraded are part of a ring topology, all spans in the ring must be upgraded. The protect
configuration (two-fiber MS-SPRing, four-fiber MS-SPRing, MSP, or 1+1) that was used with lower-rate
optical card is retained in the higher-rate upgrade.
Span upgrades can be performed using the CTC software upgrade wizard, or they can be performed
manually. To use the wizard, follow the procedure in the “Span Upgrade Wizard” section. To upgrade a
span manually, follow the procedures in the “Manual Span Upgrades” section.
Note Span upgrades do not change SDH topologies. For example, a 1+1 scheme is not upgraded to a
two-fiber MS-SPRing during a span upgrade. See the “SDH Topologies” chapter in the Cisco ONS
15454 SDH Installation and Operations Guide for topology upgrade procedures.
4.5.1 Span Upgrade Wizard
The Span Upgrade Wizard automates all steps in the manual span upgrade procedure (MS-SPRing, MSP,
and 1+1). The Wizard can upgrade both lines on one side of a four-fiber MS-SPRing or both lines of a
1+1 group. The Wizard upgrades MSPs and two-fiber MS-SPRings one line at a time. The Span Upgrade
Wizard requires that spans have DCC enabled.
Note The CTC software Span Upgrade Wizard only supports STM-N span upgrades. It does not support
electrical card upgrades.
Note During the span upgrade, minor alarms and conditions will occur and clear automatically. However,
no service-affecting alarms (SA, Major, or Critical) should be expected. If any service-affecting
alarms occur, Cisco recommends backing out of the procedure.
Procedure: Span Upgrade Wizard
Note If an abnormal error occurs while you are using the Span Upgrade Wizard, you must exit the wizard
and initiate the manual procedure to finish the upgrade, or you must back out of the procedure. If you
continue the upgrade manually, examine the standing conditions and alarms to identify the stage
where the wizard failure occurred. If it is necessary to back out of the procedure while using the
wizard, it can be carried out by downgrading. This is performed exactly as the procedure for
upgrading, but you select lower-rate cards instead of higher-rate cards.
Purpose Upgrading a span
Tools/Equipment
Prerequisite procedures
Required/As Needed As needed
On Site/Remote On Site
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