APPENDIX SCE 2000 Manual - Page 2

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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:
•
•
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.
Figure A-3
traffic is simply transferred through the bypass module to the SCE 2000 platform.
Figure A-1
Switch
Figure A-4
flows through the bypass module, and the GBE link no longer includes the SCE 2000 platform. Note that
when the bypass module is active, it puts the SCE 2000 platform into a loop connection, creating a
shortcut between the SCE 2000 platform GBE interfaces.
Cisco SCE 2000 4xGBE 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 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.)
illustrates the operation of the bypass module when it is inactive (not in bypass). The data
Operation of the Bypass Module When Inactive
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
2000
LINK/
AUX
LINK RX
4xGB E
Series
ACTIVE
1000
10/100/
ACTIVE
LINK/
10/100/
TX
LINK RX
1000
TX
LINK RX
TX
LINK RX
RX
MM
TX
TX
RX
MM
TX
RX
MM
TX
RX
GBE-1
MM
TX
SUB
LINE
NET
GBE-2
SUB LINE/CASCA
DE NET
SCE 2000 4xGBE
Appendix A
The External Optical Bypass Module
Router
Control
No Bypass
OL-21096-02