Alcatel-Lucent 9500 MXC, User Manual, Page: 194 / 916

Chapter 3. 9500 MXC Nodes
Vol. II-3-100 Alcatel-Lucent
setting of a time of day when an unwrap will occur providing all wrap conditions
have been cleared for a period not less than that set in the Error-free Timer. This
timer has a 1-hour window; if the conditions which caused the wrap are not
cleared by the Error-free Timer during this window, then Delay Ring Unwrap
resets for the same time the following day.
• The System/Controls screen provides a countdown timer to indicate the time to
go before the ring will unwrap. Applies to both the Error-free Timer and Delay
Ring Unwrap Timer. (Counts down to zero).
DAC Protection Switching Criteria
The Tx and Rx tribs are independently switched. Switching is not hitless.
• 200 ms maximum restoration time for a Tx or Rx trib switch.
• Trib protection is available for E3/DS3 and STM1/OC3 DACs, including DAC
3xE3/DS3M and DAC 155oM. Switch criteria are common for all DACs.
Refer to:
• Tx Trib Switching
• Rx Trib Switching
Tx Trib Switching
Transmitter switching to the alternate DAC transmitter is initiated for the
following local alarm conditions:
• SW/HW failure:
• Plug-in missing or incorrect
• FPGA software load failure
• LIU failure
• Clock generator failure
Rx Trib Switching
Receiver switching to the alternate DAC receiver is initiated for the following
local alarm conditions:
• SW/HW failure:
• Plug-in missing or incorrect
• FPGA software load failure
• LIU failure
• Clock generator failure
• Tributary LOS