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Comparison Between the Revertive Attribute of the Intelligent Feature and the Press-to-Restore Function

Publication Date:  2012-07-25 Views:  75 Downloads:  0
Issue Description
The current intelligent feature includes the revertive and press-to-restore properties. Which attribute should be selected to recover the original path or even the original timeslot after switching? 

Alarm Information
Handling Process
Learn about the similarities and differences between the revertive and press-to-restore properties so that a proper function can be selected to meet specific requirement.  
Root Cause
Revertive is one of the service properties and currently applies to diamond, gold and silver services. This attribute is different from the press-to-restore function.
The press-to-restore function remembers the original path and is used to manually recover the path after operations such as rerouting for optimization.
Detailed function:
The current revertive service enables automatic recovery, a process similar to multiplex section switching, and applies to rerouting only. In the cast of rerouting, the service does not delete the original path but sets up an SNCP, when the original link goes up, automatically switches to the original path after the WTR time expires and deletes the rerouting path.
The press-to-restore function does not use the original timeslot but remembers it (the case is the same in R5). If the timeslot is idle during recovery, it is used preferentially. If it is already in use, another timeslot on the original link is used. Currently this service applies to diamond, gold and silver services.
The press-to-restore function in R2 enables returning to the original timeslot for gold services. For the other services, only the original route is recovered while the original timeslot may not.
This function is modified in R5 to allow the recovery of the original timeslot if it is not being used. To keep the original timeslot idle during recovery, the revertive service can be chose, which does not remove the original path and the recovery is implemented through SNCP switching.
At present, the revertive service applies to diamond, gold and silver services.
The revertive service does not cause any delay but instead rerouting is triggered right after an alarm detected. The current revertive service is only available with the automatic mode, and the manual mode is to be implemented in R5.
The current press-to-restore function applies to the revertive and the non-revertive services at diamond, gold, silver and copper levels. For the revertive service, the function cannot be used before switching back (when there are two LSPs). Instead, it is used after optimization (another path is used without the setting for recovering the original path after optimization) to recover the original path. 

A comparison between similar features can help prevent unilateral understanding of the features, which can lead to wrong selection and in return failure to meet customer’s demand.