RE: Switching Capability of Photonic Links with Transponder

Hi Greg,

Yes the interface is a single lambda and then there should be a DWDM Line system or could be as you said a RODAM.

Great mind have similar thought J J

Diego

From: Greg Bernstein [mailto:gregb@grotto-networking.com]
Sent: giovedì 5 luglio 2007 18.39
To: Diego Caviglia (GA/ERI)
Cc: ccamp@ops.ietf.org
Subject: Re: Switching Capability of Photonic Links with Transponder

Hi Diego, looks like we've been thinking about similar issues lately.
First, I want to nail down the interfaces on your lambda switch below.
Are they:
(a) WDM interfaces, i.e., with multiple lambda's coming in and out.
(b) single wavelength interfaces
(c) a combination of the two, e.g., like in a ADM (or ROADM) where we have line side (WDM) and drop side single wavelength.

On terminology instead of "frequency switching" can we call it by its more typical name "wavelength conversion" to avoid confusion with "lambda switching" (since lambda's and frequencies have a 1-1 correspondence and both are used to describe optical signals in ITU-T recommendations).

Given where the OEO is located I'd say that particular interface is a single wavelength.

Regards

Greg B.

Diego Caviglia (GA/ERI) wrote:

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?

Diego

Diego Caviglia

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