Re: Question regarding bi-directional connection set up - And Port-ID in Label object

[Maarten Vissers <mvissers@lucent.com>]

Fong,

>    "An example of bundling is inverse
>    multiplexing, it is useful when a higher order signal needs to be
>    transported over a number of lower order signals, e.g. when a 10Gbps
>    signal must be transported over four 2.5Gbps signals. In that case,
>    the lower order signals must follow exactly the same path, and be
>    treated in the same way, in order to achieve the same characteristics
>    (e.g. delay). To support inverse multiplexing, a request is made to
>    open in parallel and in one single operation several LSPs at the same
>    time."

The above text is not aligned with today's transport layer capabilities
in SDH/SONET. VC-n/STS/VT virtual concatenated signals must NOT follow
exactly the same path, they may do so. The recent defined VC-n-Xv LCAS
(link capacity adjustment scheme) assumes that the group of X VC-n
signals is routed over at least two diverse routes. The need to co-route
all members of the group depends mainly on the differential delay that
the virtual concatenation egress point can accomodate. If it is very
low, you better co-route all signals. Otherwise, co-routing is not
necessary as long as the differential delay is less than the maximum
differential delay that the endpoint can compensate.

Regards,

Maarten
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