Appendix A The External Optical Bypass Module
External Optical Bypass Functionality
External Optical Bypass Functionality
The External Optical Bypass module is connected
•GBE optical connections for data link traffic — GBE connections from the External Optical Bypass module to both GBE line ports.
•Power and Control connection — Connection to a dedicated connector on the SCE 1000 platform back panel, so the SCE 1000 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 1000 platform.
In case the SCE 1000 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 1000 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 1000 platform.
Figure A-1: External Optical Bypass Module: Inactive (not in bypass)
The figure below illustrates the operation of the bypass module when it is active (in bypass). The data traffic flows through the bypass module, and the GBE link no longer includes the SCE 1000 platform. Note that when the bypass module is active, it puts the SCE 1000 platform into a loop connection, creating a shortcut between the SCE 1000 platform GBE interfaces.
Figure A-2: External Optical Bypass Module: Active (in bypass)
Cisco SCE 1000 2xGBE Installation and Configuration Guide
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