A P P E N D I X A
The External Optical Bypass Module
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
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
Cisco SCE 1000 2xGBE Installation and Configuration Guide
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