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Cisco ONS 15327 Product Overview, R3.3

June 2002

Cisco ONS 15327 Product Overview

In-Service Span Upgrades

Figure 17 Customized network topology map

In-Service Span Upgrades

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

following ONS 15327 cards:

• OC-12 to OC-48

• OC-12 IR to OC-12 LR

• OC-48 IR to OC-48 LR

To perform a span upgrade, the higher-rate/long-reach optical card must replace

the lower-rate/intermediate-reach card in the same slot. If the upgrade is

conducted on spans residing in a BLSR, all spans in the ring must be upgraded.

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