Hmmmmmm not sure my Understanding of the lambda switching is what I’ve called spatial switching that is lambda1 portA à lambda1 portB what is not clear to me is how can be advertised an OEO transponder that can only perform frequency switching lambda1 à lambda 2.
Adrian? Deb? Anyone else?
BR
Diego
-----Original Message-----
From: MEURIC Julien RD-CORE-LAN [mailto:julien.meuric@orange-ftgroup.com]
Sent: mercoledì 4 luglio 2007 18.47
To: Diego Caviglia (GA/ERI); ccamp@ops.ietf.org
Subject: RE: Switching Capability of Photonic Links with Transponder
Hi Diego.
I believe we should refer to the Holly RFC 3945, chapter 1, verse 2:
- "Lambda Switch Capable" interfaces "can operate at the level of an *individual wavelength*" [or a "group of wavelengths"], meaning that you manipulate values of wavelengths (as AU-4 numbers [or AU-4 ranges] from an SDH portA to SDH portB), like in a ROADM;
- "Fiber-Switch Capable" interfaces "can operate at the level of a single or multiple *fibers*", meaning *spatial switching* where you don't consider the type of signal that ports convey (could be anything like a black and white signal, a wavelength, a WDM multiplex, some optical packets...), like in a OOO PXC.
To stick with strict terminolgy: lambda = wavelength = (speedOfLight / frequency)
So if you need to do "frequency switching", then it is the so called "lambda switching". :-)
Anyway, this is my understanding, so if I'm wrong or if it's a vocabulary issue because you find that terms are inappropriate, then we'd better ask father Adrian and sister Deborah.
Cheers,
Julien
-----Original Message-----
From: Diego Caviglia (GA/ERI) [mailto:diego.caviglia@ericsson.com]
Hi Julien,
Actually not the PXC I had in mind is able to switch a single lambda I didn't but the mux/demux In the picture sorry.
The point I failed to illustrate is the ambiguity of the term "Lambda Switch Capable" given that there two possible ways to switch a lambda.
The first one is the spatial one: (Lambda1 portA) --> (Lambda1 portB) this is the way an all optical switch works and this why there is the lambda continuity constraint in photonic networks.
The second one is the frequency switching: (Lambda1 portA) --> (Lambda2 portA) this switching can be done via a transponder (OEO) device.
Of course is possible to mix the two switching having (Lambda1 portA) --> (Lambda2 portB)
My impression is that the definition "Lambda Switch Capable" refers to the spatial switching and thus I don't know how to model the fact that after/before a photonic matrix I have a transponder.
I hope I've made my question clearer.
Best Regards
Diego
-----Original Message-----
From: MEURIC Julien RD-CORE-LAN [mailto:julien.meuric@orange-ftgroup.com]
Sent: martedì 3 luglio 2007 19.21
To: Diego Caviglia (GA/ERI); ccamp@ops.ietf.org
Subject: RE: Switching Capability of Photonic Links with Transponder
Hi Diego.
If I understand correctly, your "lambda switch" by itself is a PXC that
has only "Fiber-Switch Capable" interfaces. Then, you add
lambda-conversion cards to it. So, correct me if I'm wrong (you or
anyone else), but whether you do a lambda conversion inside a card or in
a core matrix, this new interface on your global device is able to work
on lambdas anyway [(lambda 1, port A) --> (lambda2, port B)]. As a
result, you need to advertise your most flexible capability, which is
"Lambda Switch Capable".
If you used "FSC", you wouldn't be able to control your "lambda
swapping" card, as LSPs are like lists of fibers and labels aren't
wavelengths but ports.
But maybe I didn't get your actual issue.
My 2 cents,
Julien
________________________________
From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org] On
Behalf Of Diego Caviglia (GA/ERI)
Hi all,
I've a doubt about how to model the following situation.
+-----------------+
| |-------+
| | OEO |
| Lambda |-------+
| Switch |
| |
| |
+-----------------+
The node itself is able to cross connect only the Lambda while the
interface has a OEO transponder that is able to change the lambda
frequency. In this case there are two different 'switching capability'
the spatial one that is performed by the switch (lambda 1, port A) -->
(lambda1, port B) and the frequency switching is done by the OEO
transponder. Witch kind of interface switching capability I have to
advertise?
BR
Diego
Diego Caviglia
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