Alcatel-Lucent 9500 MXC User Manual page 616

Chapter 15. Diagnostics
Ring Menu Operation
Protection Controls Operation
Vol. IV-15-54
Figure 15-19 illustrates operation of the west and east Online and Offline locks.
Both are supported by safety timers.
• Online locks the selected west and/or east RAC online; ring wrapping is
disabled by the selection. It is used for situations where ring wrapping is not
wanted, such as during link testing and alignment. May also be used to return a
link from a wrapped state (Lock On, followed by Off (Auto) before expiration
of the 5 minute revertive-switch guard time (assuming the event that caused the
wrap has been cleared). Refer to Ring Protection Switching Criteria on
page 3-98, Volume II, Chapter 3.
• Offline forces a ring wrap at the selected west or east RAC. Forcing a wrap has
the same affect as a path/signal loss, and will also force a wrap at the remote
Node for the affected link (providing the link is not already wrapped).
• Note that the Countdown Timer will be activated as soon as an Offline lock
is applied. The time will remain fixed at the time set for the Error-free Timer
in the Protection screen, until the lock is removed, whereupon it will count
down to zero before removing the wrap (assuming there are no prevailing
wrap conditions). To bypass the Countdown Timer, use the Online lock:
lock Online > Send > Off (Auto) > Send.
• Countdown Timer indicates the time to go before an unwrap can occur.
(Counts down to zero). Applies to both the Error-free Timer and Delay Ring
Unwrap Timer settings. Both timers are configured in the Protection screen.
Refer to Node Protection Operation and Rules, Volume IV, Chapter 8.
For safety timer operation refer to Safety Timer Operation on page 15-50.
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