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Please refer to Table 1 for a description of the terminology.
Before we delve into estimating the delay for each scheme, we shall define
the delay for a path.
If and is the delay incurred due to a message
travelling hops through the DCN and the OTN respectively, then:
We shall follow the discussion in 
and calculate the restoration delay as contributed by each phase of
The RSVP/Backup Tunnel serial restoration scheme.