External Optical Bypass Functionality - Cisco SCE 1000 Installation And Configuration Manual

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 1000 platform with two types of connections:
•
•
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.
Figure A-1
traffic is simply transferred through the bypass module to the SCE 1000 platform.
Figure A-1
Switch
Figure A-2
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.
Cisco SCE 1000 2xGBE Installation and Configuration Guide
A-2
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 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.)
illustrates the operation of the bypass module when it is inactive (not in bypass). The data
External Bypass Module: not in bypass
Tx
illustrates the operation of the bypass module when it is active (in bypass). The data traffic
External optical
bypass module
Sub Net
Rx Tx Rx
PWR A
PWR B STATUS
MNG 1 BYPASS Cisco SCE
MNG 2 CONSOLE 1000
LINK/ 10/100/ AUX LINK RX TX 2xGB E Series
ACTIVE 1000 ACTIVE LINK/ 10/100/ LINK RX
1000 TX
RX MM
TX RX MM
TX
GBE-1
SUB LINE
NET
SCE 1000 2xGBE
Appendix A External Optical Bypass Module
Router
Control No Bypass
OL-26790-01