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RE: GMPLS dynamics vs. issues with optical amplifiers
About a year ago we started to collect requirements for towards this
area in a draft. Our current thinking is that the optical/photonic
networks will have fairly proprietary ways of dealing with the
non-linear properties but that the interface to GMPLS can be summarized
as a fairly generic network interface with a simple metric and a
blocking capability. We only got as far a the requirements. The draft
is in in need of a refresh I will try to do that shortly. I have to
contact some other people who were interested in the area.
If you cannot find a copy of the draft I will send it to you.
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com] On Behalf Of Filippo Cugini
> Hi all,
> IMO the issue will have to be faced soon. Transparent network
> elements such
> as ROADM and PXC are beginning to be deployed in optical
> transport networks. However, the current GMPLS does not
> provide any functionality to keep track
> of the signal quality degradation. Thus, transparent mesh
> networks must be
> statically designed, during the network planning, to
> guarantee that even the
> most impaired connection (e.g., the longest path) is
> acceptable. Otherwise,
> because of the current GMPLS limits, connections can
> successfully be set up
> even if they do not comply with physical parameters
> constraints. However, the worst case design approach heavily
> limits the size of the
> transparent networks.
> ----- Original Message -----
> From: "Adrian Farrel"
> > [..]
> > - There *might* be a future requirement to signal certain
> > constraints, but we would need to see the requirements clearly
> > stated.
> > - There is probably a need to enhance the advertisement of
> > some key physical attributes of optical links and nodes in
> > the IGPs. At the moment, however, this information
> > appears to be gathered through inventory systems and
> > there has been very little consideration of this requirement.