Cisco ONS 15327 Manual page 15

A span is the optical fiber connection between two ONS 15327 nodes. In a span upgrade, the
transmission rate of a span is upgraded from a lower to a higher OC-N signal but all other span
configuration attributes remain unchanged. With multiple nodes, a span upgrade is a coordinated series
of upgrades on all nodes in the ring or protection group in which traffic carried at a lower OC-N rate is
transferred to a higher OC-N.
You can perform in-service span upgrades for the OC-12 to OC-48 ONS 15327 cards.
The supported configurations for a span upgrade are:
1+1 Unprotected PPMN
1+1 Linear ADM
2-Fiber BLSR
UPSR
To perform a successful span upgrade, the higher-rate optical card must replace the lower-rate card in
the same slot. If the upgrade is conducted on spans residing in a BLSR, all spans in the ring must be
upgraded. The protection configuration of the original lower-rate optical card (two-fiber BLSR, UPSR,
and 1+1) is retained for the higher-rate optical card.
When performing span upgrades on a large number of nodes, Cisco recommends that you upgrade all
spans in a ring consecutively and in the same maintenance window. Until all spans are upgraded,
mismatched card types will be present. No other maintenance operations should be performed or circuits
added during a span upgrade.
Cisco recommends using the Span Upgrade Wizard to perform span upgrades. Although you can also
use the manual span upgrade procedures, the manual procedures are mainly provided as error recovery
for the wizard.
The Span Upgrade Wizard and the manual span upgrade procedures require at least two technicians (one
at each end of the span) who can communicate with each other during the upgrade. Upgrading a span is
non-service affecting and will cause no more than three switches, each of which is less than 50 ms in
duration. For more information on span upgrades, see the Cisco ONS 15327 User Documentation,
Release 3.3.
Span upgrades do not upgrade SONET topologies, for example, a 1+1 group to a two-fiber BLSR. See
Cisco ONS 15327 User Documentation, Release 3.3 for topology upgrade procedures.
Span Upgrade Wizard
In Release 3.3, the Span Upgrade Wizard automates all steps in the manual span upgrade procedure
(BLSR, UPSR, and 1+1). The wizard can upgrade both lines of a 1+1 group; the wizard upgrades UPSRs
and two-fiber BLSRs one line at a time. The Span Upgrade Wizard requires that spans have DCC
enabled.
The Span Upgrade Wizard provides no way to back out of an upgrade. In the case of an abnormal error,
you must exit the wizard and initiate the manual procedure to either continue with the upgrade or back
out of it. To continue with the manual procedure, examine the standing conditions and alarms to identify
the stage in which the wizard failure occurred. For more information on the Span Upgrade Wizard, see
the Cisco ONS 15327 User Documentation, Release 3.3.
Alarm Suppression
At the card level, you can suppress alarms on specific ports. At the node level, you can suppress alarms
on specific cards or the entire node.
OL-2671-01
New Features and Functionality
Release Notes for Cisco ONS 15327 Release 3.3
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