Waveband definition [was: GMPLS Message Structures]

[Maarten Vissers <mvissers@lucent.com>]

Manoj, Yuri,

I received a message that my definition of waveband is too restricted. 

A waveband should be an optical multiplex, administered as a single
bundle, not necessary contiguous in frequency slot.

	E.g. there may be good technical reasons to consider a
	'waveband' created at an OADM formed by taking every 2nd
	wavelength in a 50GHz-spaced transmission band.

In first instance the above definition may not be considered this as a
"band"; it
looks more like a "gapped-band" :-). Nevertheless, due to technical
reasons we should consider a waveband as just another name for a
particular group of wavelengths, which may best be viewed as a group of
identified/listed wavelengths. 

Regards,

Maarten

Maarten Vissers wrote:
> 
> Manoj, Yuri,
> 
> In my current understanding, a waveband is a group of OCh (optical
> channel) signals located in a contiguous set of tributary (i.e.
> frequency) slots.
> 
> A waveband is therefore related to partitioning, rather than a layering.
> A waveband shouldn't have an LSP encoding type itself, but instead be
> part of the OCh layer network. E.g. a specific RGT (requested groupting
> type) of "contiguous waveband" can be defined for this purpose with the
> RNC (requested number of components) indicating the size of the
> waveband.
> 
> The above is simply a first shot; in general the issue can be more
> complex due to the fact that the frequency slot for a 2G5, a 10G and a
> 40G signal may have differnet bandwidths: e.g. 2G5 freq. slot width e.g.
> 25 GHz, 10G freq. slot width e.g. 50 GHz and 40G freq. slot width e.g.
> 100 GHz. For the case of (future?) mixed rate WDM signals with bit rate
> optimized freq. slot widths, a waveband might need a start-of-waveband
> and end-of-waveband (SOW-EOW) indication, instead of RNC.
> 
> Regards,
> 
> Maarten
> 
> Yuri Landry wrote:
> >
> > Mano,
> >
> > >            Can someone tell me the message structure of Label Request and
> > >Label Mapping in GMPLS ?
> > >I am confused about the presence of LightPath Id in O-UNI messages and LSP
> > >Id in GMPLS messages ? Is there one-to-one mapping between these Ids or Is
> > >it like that both lightPath Id and LSP Id will be carried in GMPLS messages
> > >? LSP Id is not present in O-UNI messages. Can one LightPath Id be mapped
> > >to
> > >multiple LSP Ids or vice versa ?
> >
> > I think you mean Connection ID and LSP ID. A connection ID is an ID for
> > network connection, which may consist many LSPs. For example, the virtual
> > concatenation case.
> >
> > A LSP may tunnel through multiple pre-established connections.
> >
> > >Also, for waveband switching, the genralized label has the format
> > >(wavebandId - start label - end label).
> > >When the label request message is received on incoming interface, how to
> > >identify that the waveband label is requested ?
> > >Is it the LSP encoding type or some other parameter in label request
> > >message
> > >? If it is the Lambda encoding type then how to identify that whether a
> > >lambda or waveband label is requested ?
> > >
> > >Also, it is mentioned that wavebandId (32 bits) is selected by the sender
> > >and reused in all the subsequent messages. What all subsequent
> > >messages is it mentioning to ?
> > >
> > >Can wavebandId be present in Label Withdraw/Release messages ?
> > >
> > >I am not able to workout the message structures for GMPLS.
> > >
> >
> > To me waveband label defined in GMPLS drafts is a joke. The reason to have
> > the waveband label is that someone claimed that the waveband's order might
> > flip when going through a switch. My suggestion is don't take it seriously.
> >
> > >I am not sure how these drafts are at last call. Atleast it should mention
> > >the message structures of various messages.
> > >
> >
> > Agree.
> >
> > Regards,
> >
> > Yuri
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
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