Network Router User Manual

7-4
Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter 7 Configuring APS
Configuring Splitter Protection
Considerations for Using Splitter Protection
The following considerations apply when considering the use of splitter protection:
• Splitter protection does not protect against failure of the splitter line card. Splitter protection also
does not protect against failure of a client line card or of the client equipment.
To protect against laser failure for both transponder line cards and 10-Gbps ITU trunk cards, use
y-cable protection as described in the “About Line Card Protection” section on page 7-6 and the
“Configuring Y-Cable Based Line Card Protection” section on page 7-10. To protect against
ESCON card failure or the client equipment, implement protection on the client equipment instead.
• A fully provisioned single shelf configuration can support 4 channels in splitter protection mode. A
fully provisioned multiple shelf configuration can support up to 32 channels in splitter protection
mode.
For more information about multiple shelf nodes, see Chapter 8, “Configuring Multiple Shelf
Nodes.”
• Splitter protection supports revertive behavior. With revertive APS, the signal automatically
switches back to the working path after the receive signal defect has been corrected and the wait to
restore timer is expired. The default behavior is nonrevertive. When defects on the working channel
are cleared, a wait to restore timer is started. Once this timer expires, the working channel becomes
the active channel if no other problems occur on the working path.
• For interfaces configured for splitter APS and either Sysplex ETR or Sysplex CLO protocol
encapsulation, configure bidirectional path switching to ensure proper functioning of these
protocols.
• For bidirectional path switching to function on the transponder line cards, the OSC is required for
exchanging APS channel protocol messages. For bidirectional path switching on the 10-Gbps ITU
trunk card, either the in-band message channel or the OSC can be used for the APS channel protocol
messages.
For detailed information on shelf configuration rules, refer to the Cisco ONS 15530 Planning and Design
Guide.
Configuring Splitter Protection
The following steps describe the tasks required to configure splitter protection:
Step 1 Determine the number of channels you will deploy to transport client data.
Step 2 Ensure that the correct line cards are inserted in slots 1 through 4 or 7 through 10.
Step 3 Ensure that the line cards and modules are correctly interconnected with the external optical patch
cables. For ring topologies, connect the thru interface on one OADM to the thru interface on the other.
Step 4 Configure the interfaces and the patch connections from the CLI (command-line interface).
Step 5 Configure APS from the CLI.