Cisco Systems SCE 2000 4xGBE manual External Optical Bypass Functionality

Appendix A The External Optical Bypass Module

External Optical Bypass Functionality

External Optical Bypass Functionality

The External Optical Bypass module is connected bump-in-the-wire in the GBE link. It is then connected to the SCE 2000 platform with two types of connections:

•GBE optical connections for data link traffic: GBE connections from the External Optical Bypass module to one pair of the GBE line ports.

•Power and Control connection: Connection to a dedicated connector on the SCE 2000 platform back panel, so the SCE 2000 platform can provide power to the External Optical Bypass module. (Note that the power connection also provides the logical control functionality.)

The External Optical Bypass module is normally inactive, (not in bypass), and simply transfers the two GBE signals to and from the SCE 2000 platform.

In case the SCE 2000 platform stops providing power to the External Optical Bypass module, or in case the power cable is disconnected from the optical bypass module, the External Optical Bypass module becomes active, bypassing the two GBE links to the SCE 2000 platform, and thus preserving network connectivity.

The figure below illustrates the operation of the bypass module when it is inactive (not in bypass). The data traffic is simply transferred through the bypass module to the SCE 2000 platform.

Figure A-1: External Optical Bypass Module: Inactive (not in bypass)

SCE 2000 4xGBE Installation and Configuration Guide

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