Ring Protection - Alcatel-Lucent 9500 MXC User Manual

Chapter 1. Commissioning

Ring Protection

Ring Wrapping Procedure
Vol. V-1-14
Ring protection (wrapping and unwrapping) is not hitless.
Ensure the ring is not already wrapped (all Nodes operating normally and
unwrapped).
• From the local node this can be determined by logging into other nodes on the
ring.
• If the ring is wrapped at any point, the test procedure is not valid; full ring
protection is only provided for a single break in the ring.
The procedure uses the Tx mute function to simulate a path failure.
Test procedure:
1. Set a BER test on a looped ring circuit. Confirm zero errors.
2. Go to Diagnostics > System Controls and select the Ring link.
3. Click Tx Mute for the East RAC, then click Send. This immediately mutes the
East Tx, and initiates ring wrapping.
4. Confirm that service is restored within a count of one errored second (possibly
two). Refer to Test Measurement on page 1-7.
5. Reconnect the ODU cable and confirm normal ring operation returns within
5 minutes. At the instant it returns to normal, un-wrapped operation, service
is restored within a count of one errored second (possibly two).
6. Repeat steps 2 to 5 for the West RAC.
For more information on commissioning a ring network, refer to Appendix A.
Alcatel-Lucent