Specifications

19
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.