Chapter 1. Commissioning
Vol. V-1-10 Alcatel-Lucent
Confirming Link and Ring Protection
Procedures are separately provided for:
• Hot-standby and space diversity
• Frequency diversity
•Ring
Before commencing:
• Check the protected link is operating normally:
• No alarm icons in the CT status bar (green/0).
• No G.826 errors in the Performance screen.
• Determine the primary/secondary or east/west RACs and their online status.
• For hot-standby and space/frequency diversity links the default
configuration has the online Tx function with the primary RAC, and the
online Rx function with the secondary RAC. View online status in the
System/Controls screen.
• For ring links both east and west RACs are transmitting and receiving.
• A RAC front panel online LED will be green if it is online for Tx, or Rx, or
Tx and Rx. It will be unlit if it is not online for Tx or Rx.
Preliminary
In the procedures provided:
A BER test can be applied using the PRBS function built into E1/DS1, E3/DS3,
or STM1/OC3 DACs, or an external BER tester.
Other procedures can be used. For example, the built-in PRBS functions can be
activated at both ends of a protected link to provide a both-way test on a trib
(both directions separately monitored).
CT screens for local and remote Nodes can be dragged to different parts of your
PC screen for easier management.
The test procedures described are based on default primary and secondary RAC
settings. This has the primary RAC online transmitting, and the secondary RAC
online receiving.
Where the built-in PRBS Generation function is being used to check protection
switching:
• For each switch event that is not designed to be hitless, the Errored Second
count increments by 1, or depending on the counter time boundary relative to
the event, a maximum of 2. Refer to Test Measurement on page 1-7.
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