The External Optical Bypass Module - Cisco CE 2000 Platform SCE 2000 4xGBE Installation And Configuration Manual

The External Optical Bypass Module

The SCE 2000 platform External Optical Bypass module preserves the service provider GBE
links in case of complete power failure of the SCE 2000 platform, or for implementing a
maintenance window.
The SCE 2000 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 2000 platform already includes an internal Electrical Bypass module that puts the SCE
2000 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 2000 platform: The SCE 2000 platform includes
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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
2000 platform simultaneously, the network link will be preserved by the External Optical
Bypass module.
Maintenance window implementation: In certain situations the SCE 2000 platform should be
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pulled from the network for replacement, such as:
In these cases, a maintenance window is implemented, during which the SCE 2000 platform
is pulled from the network. It may be replaced by another SCE 2000 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.
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Hardware failure in the SCE 2000 platform.
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Hardware upgrade on the SCE 2000 platform
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SCE 2000 4xGBE Installation and Configuration Guide
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