RE: Fwd: LSC Interface Doubt ...

[Heiles Juergen <Juergen.Heiles@icn.siemens.de>]

Maarten,

when using the name transponder we should be more specific. In your answer you talk about 3-R transponders which terminate the OCh.
For pure wavelength conversion one could use an analog o-e-o transponder. In this case the OCh (as it is the baseband signal without a wavelength assigned) is not terminated.
Normally when speaking about transponders people mean 3-R transponders as they are most common today.

Juergen

> -----Original Message-----
> From: Maarten Vissers [mailto:mvissers@lucent.com]
> Sent: Friday, December 07, 2001 10:30 AM
> To: manoj juneja
> Cc: ccamp@ops.ietf.org
> Subject: Re: Fwd: LSC Interface Doubt ...
> 
> 
> Manoj,
> 
> Are you aware that a PXC can be operated as an ODUk switch or 
> a STM/OC-N switch
> in addition to an OCh switch?
> 
> The PXC is a name for an optical fabric equipment. As fabrics 
> are typical more
> transparent than the connected line/trib ports, those latter 
> determine the
> switching type. E.g. a PXC connected to optical line systems including
> transponders will not operate at wavelenght level. The 
> transponders have
> terminated the wavelenghts. Such combination will switch ODUk 
> and/or STM/OC-N
> signals. For the case the line systems do not have 
> transponders, the PXC
> operates as true OCh (i.e. wavelength) switch.
> 
> Most line systems in the core network today deploy 10G 
> wavelengths, whereas many
> service signals are at 2G5 level. Therefore, the transponders 
> in the line system
> may include 4:1 TDM multiplex circuits. With future 40G 
> wavelengths, there will
> be 16:1 TDM mux circuits (case of 2G5 services) and 4:1 TDM 
> mux circuits (case
> of 10G services). Here it is more obvious that the PXC doesn't switch
> "wavelenghts".
> 
> Therefore LSC for me is limited to true G.709 OCh switching; 
> i.e. when no
> transponders are present around the fabric.
> 
> Regards,
> 
> Maarten
> 
> manoj juneja wrote:
> > 
> > Hi Marteen,
> >             I refer to LSC interface as defined in GMPLS 
> architecture
> > document (i.e. interface which switch data based on the 
> wavelength on
> > which the data is received e.g. PXC or OXC which operate at 
> the level
> > of individual wavelength). I don't think it has any thing to do with
> > Och (G.709).
> > 
> > Regards,
> > manoj.
> > 
> > >From: Maarten Vissers <mvissers@lucent.com>
> > >To: manoj juneja <manojkumarjuneja@hotmail.com>
> > >CC: ccamp@ops.ietf.org
> > >Subject: Re: Fwd: LSC Interface Doubt ...
> > >Date: Thu, 06 Dec 2001 11:42:02 +0100
> > >
> > >Manoj,
> > >
> > >I assume you refer to G.709 OCh connections when you use 
> the term "LSC
> > >LSP". If
> > >so, then a bi-directional OCh link connection will use the same OCh
> > >tributary
> > >slot in both directions; i.e. the same wavelenght is used 
> for go and return
> > >direction.
> > >
> > >Regards,
> > >
> > >Maarten
> > >
> > >manoj juneja wrote:
> > > >
> > > > Hi All,
> > > >         If I need to establish a bi-directional LSC LSP 
> then do I
> > > > need to configure the remote end wavelengths on an LSC 
> interface ?
> > > > Is there any case where both the upstream and 
> downstream labels of an
> > > > bi-directional LSC LSP be same ?
> > > >
> > > > Regards,
> > > > manoj.
> > > >
> > > > 
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