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RE: Optical impairments in draft-ietf-mpls-generalized-signaling- 04
Hi
For a full optical network, as Mr. Drake mentioned, there are some issues to
be resolved, eg. optical 2R/3R, WC, and PMD, etc. However, by use of a
combination between lambda and fiber cable, we can provide a good solution
for a limited size of network. By use of GMPLS, we should only avoid the
case such that more than two defferent sources have the same lambda and are
"wdm"ed to the same fiber cable.
Thank you,
-----Original Message-----
From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org]On Behalf Of
John Drake
Sent: Wednesday, June 27, 2001 6:58 AM
To: 'Heiles Juergen'; 'Yangguang Xu'; Diego Caviglia
Cc: Ayan Banerjee; ccamp@ops.ietf.org; Giovanni Fiaschi
Subject: RE: Optical impairments in draft-ietf-mpls-generalized-signaling-
04
Announcing wavelength availability information in routing doesn't work
because of the flooding traffic it would generate, plus there are still race
conditions that would have to be handled by signalling anyway. Label set
was intended to support wavelength continuity issues.
Also, in the short term, we're dealing with transponder based interfaces to
the DWDM systems so this is a non-issue. In the longer term, this is just
another issue like PMD and OSNR that will need to be dealt with.
-----Original Message-----
From: Heiles Juergen [mailto:Juergen.Heiles@icn.siemens.de]
Sent: Tuesday, June 26, 2001 7:43 AM
To: 'Yangguang Xu'; Diego Caviglia
Cc: Ayan Banerjee; ccamp@ops.ietf.org; Giovanni Fiaschi
Subject: RE: Optical impairments in
draft-ietf-mpls-generalized-signaling- 04
Yangguang,
wavelength conversion is in my view an issue for path selection as you
cannot select a certain path if the wavelength doesn't fit and you have no
wavelength conversion.
Regards
Juergen
> -----Original Message-----
> From: Yangguang Xu [SMTP:xuyg@lucent.com]
> Sent: Tuesday, June 26, 2001 3:13 PM
> To: Diego Caviglia
> Cc: Ayan Banerjee; ccamp@ops.ietf.org; Giovanni Fiaschi
> Subject: Re: Optical impairments in
draft-ietf-mpls-generalized-signaling-04
>
>
> Diego,
>
> As indicated by the document that Ayan pointed to you, there are many
constrains
> for the optical networking. These constrains can be considered at network
> planning time, path selection time (routing using OSPF-TE/ISIS-TE) or
connection
> setup time(GMPLS signaling). When a constrain is considered is an
engineering
> issue. We just have to figure out when and where is the best and cheapest
to
> consider a constrain. To wavelength conversion, GMPLS signaling is a good
place
> to handle.
>
> Thanks,
>
> Yangguang
>
> Diego Caviglia wrote:
> >
> > Ayan,
> >
> > Thanks for your answer but I don't understand why lambda
conversion is
> > a signalling problem and thus is covered in generalized signalling
draft while
> > others optical impairments are routing problem and are covered in a
separate
> > document.
> >
> > Moreover even if the document you quoted is a well written and very
useful one
> > it is an informative contribution that simply points out the
physically
> > impairments of an all optical network. It doesn't propose any
extension to
> > OSPF/IS-IS in order to support optical routing.
> >
> > Given that in an All Optical Network we have to cope with
lots of new
> > information, as you stated in your document, are we sure that OSPF,
in this
> > environment, scales?
> >
> > I mean if it doesn't scale for wavelength availability information
distribution
> > why it has to scales for other optical impairment distribution?
> >
> > ----------------------------------------------------------------
> > Diego Caviglia
> > Photonic Networks Design and Modelling
> > E-mail: diego.caviglia@marconi.com
> > Tel: +39 (0) 10 6003 808
> > Via A. Negrone 1A 16153 Genoa (Italy)
> > http://www.marconi.com
> >
> > Ayan Banerjee <abanerjee@calient.net> on 25/06/2001 22.26.02
> >
> >
> >
> >
> >
> >
> >
> > To: Diego Caviglia/MAIN/MC1@MCMAIN,
> > petera@nortelnetworks.con, ccamp@ops.ietf.org
> >
> > cc: Giovanni Fiaschi/MAIN/MC1@MCMAIN
> >
> >
> >
> > Subject: RE: Optical impairments in
> > draft-ietf-mpls-generalized-signaling- 04
> >
> >
> >
----------------------------------------------------------------------------
----
> >
> > Diego,
> >
> > Please see draft-ietf-ipo-impairments-00.txt for optical constraints.
> >
> > Thanks,
> > Ayan
> >
> > -----Original Message-----
> > From: Diego Caviglia [mailto:Diego.Caviglia@marconi.com]
> > Sent: Monday, June 25, 2001 6:19 AM
> > To: petera@nortelnetworks.con; ccamp@ops.ietf.org
> > Cc: Giovanni Fiaschi
> > Subject: Optical impairments in draft-ietf-mpls-generalized-signaling-04
> >
> > Peter ,all,
> >
> > a comment about draft-ietf-mpls-generalized-signaling-04.
In
> > the
> > draft there is the label set object that is very useful in All optical
> > networks
> > with CI-incapable nodes but lambda conversion is only one of the
> > problems
> > related to path establishment in such networks. I mean what about
OSNR
> > and
> > non-linear impairments? What about gain variation and power
equalization?
> > Where
> > are covered these topic?
> >
> > If I can find a path feasible from the lambda continuity point of
view
> > who
> > assure me that I have the needed Q at the end of the all optical path?
> >
> > Best regards.
> >
> > ----------------------------------------------------------------
> > Diego Caviglia>
> > Photonic Networks Design and Modelling
> > E-mail: diego.caviglia@marconi.com
> > Tel: +39 (0) 10 6003 808
> > Via A. Negrone 1A 16153 Genoa (Italy)
> > http://www.marconi.com