Cisco SCE 1000 2xGBE Installation and Configuration Guide
OL-7821-05
A-1
The
SCE 1000
platform External Optical Bypass module preserves the service provider GBE
links in case of complete power failure of the
SCE 1000
platform, or for implementing a
maintenance window.
The
SCE 1000
platform state-of-the-art Service Control platform is being deployed at ISPs, Cable
and Wireless Tier1 provider networks, and is therefore required to comply with the carrier grade
availability requirements of these mission critical networks.
The
SCE 1000
platform already includes an internal Electrical Bypass module that puts the
SCE
1000
platform into bypass state in case of a software or hardware failure at the platform main
board, thereby preserving the GBE network link.
The External Optical Bypass module provides additional service protection by enabling automatic
preservation of the network GBE link in two additional important scenarios:
•
Complete loss of power in the
SCE 1000
platform — The
SCE 1000
platform includes
redundant Power Supply Units and redundant power feeds, in both the DC and AC versions.
However, in case either both PSUs fail, or both power feeds stop providing power to the
SCE
1000
platform simultaneously, the network link will be preserved by the External Optical
Bypass module.
•
Maintenance window implementation — In certain situations the
SCE 1000
platform should
be pulled from the network for replacement, such as:
•
Hardware failure in the
SCE 1000
platform.
•
Hardware upgrade on the
SCE 1000
platform
In these cases, a maintenance window is implemented, during which the
SCE 1000
platform
is pulled from the network. It may be replaced by another
SCE 1000
platform, either almost
immediately, or after several hours or days. An External Optical Bypass module enables the
implementation of such replacement while preserving normal operation of the network link.
The External Optical Bypass module is another important component in the Cisco overall carrier-
grade solution for high-availability service provider networks.
A P P E N D I X A
The External Optical Bypass Module
