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APPENDIX SCE 2000 Manual

External optical bypass module
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The External Optical Bypass Module
Revised: December 24, 2010, OL-21096-02
Introduction
The SCE 2000 platform External Optical Bypass module preserves the service provider GBE links in
case of complete power failure of the SCE 2000 platform, or for implementing a maintenance window.
The SCE 2000 platform state-of-the-art Service Control platform is being deployed at ISPs, Cable and
Wireless Tier1 provider networks, and is therefore required to comply with the carrier grade availability
requirements of these mission critical networks.
The SCE 2000 platform already includes an internal Electrical Bypass module that puts the SCE 2000
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:
•
•
The External Optical Bypass module is another important component in the Cisco overall carrier-grade
solution for high-availability service provider networks
OL-21096-02
Complete loss of power in the SCE 2000 platform — The SCE 2000 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 2000 platform
simultaneously, the network link will be preserved by the External Optical Bypass module.
Maintenance window implementation — In certain situations the SCE 2000 platform should be
pulled from the network for replacement, such as:
–
Hardware failure in the SCE 2000 platform.
–
Hardware upgrade on the SCE 2000 platform
In these cases, a maintenance window is implemented, during which the SCE 2000 platform is
pulled from the network. It may be replaced by another SCE 2000 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.
A P P E N D I X
Cisco SCE 2000 4xGBE Installation and Configuration Guide
A
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Summary of Contents for APPENDIX SCE 2000

  • Page 1 The SCE 2000 platform External Optical Bypass module preserves the service provider GBE links in case of complete power failure of the SCE 2000 platform, or for implementing a maintenance window. The SCE 2000 platform state-of-the-art Service Control platform is being deployed at ISPs, Cable and Wireless Tier1 provider networks, and is therefore required to comply with the carrier grade availability requirements of these mission critical networks.

  • Page 2: External Optical Bypass Functionality

    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.

  • Page 3: The External Optical Bypass Module Front Panel

    NET Rx/Tx — GBE port that connects to the network element on the Network side of the link. • CONTROL — RJ-45 port that connects to the Bypass connector on the rear panel of the SCE 2000 • platform. The SCE 2000 platform controls the External Optical Bypass module via this connection, by the presence or absence of electrical power.

  • Page 4: Installing The External Bypass Module

    Step 2 Secure the module panel to the two front posts of the rack above the SCE 2000 platform. Leave at least 1.5 cm vertical clearance between the SCE 2000 platform and the module panel to provide space for the cables from the front panel of the module to the rear of the SCE 2000 platform.
  • Page 5 A-4). If installing only one module, the connections are as follows: • Connect the fiber (steps 3 and 4) to the GBE-1 Line ports on the SCE 2000 platform. – – Connect the control cable to the Bypass 1 9-pin D-Type connector on the rear panel of the SCE 2000 platform.
  • Page 6 7-1. Step 5 Verify that the relevant GBE interfaces of the SCE 2000 platform are now in sync, as the External Optical Bypass module is now active (in bypass), and is performing a loopback on these interfaces. Auto-Negotiation should be configured identically for the two SCE 2000 platform GBE interfaces and the GBE interfaces of the switch/router on either side of the External Optical Bypass module.

  • Page 7: Specifications

    12 oz (340 g) Table A-2 Control Cable Pinouts Function Pin (D-type side) Pin (RJ-45 side) Bypass Present (common to 2) Bypass Present (common to 1) 7-NC 8-NC 9-NC Shield Shield Shield Cisco SCE 2000 4xGBE Installation and Configuration Guide OL-21096-02...
  • Page 8 Appendix A The External Optical Bypass Module Specifications Cisco SCE 2000 4xGBE Installation and Configuration Guide OL-21096-02...

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