[c-nsp] itu/c DWDM

[Marlon Duksa]

Got it. This help a lot. Thanks.Marlon

On Tue, Feb 10, 2009 at 2:36 PM, Mikael Abrahamsson <swmike at swm.pp.se>wrote:

> On Tue, 10 Feb 2009, Marlon Duksa wrote:
>
>  Hi - can anyone explain  difference between 'tunable optics' and DWDM
>> capable cards on Cisco routers (7600, 12K and CRS), or is this the same?
>>
>
> Yes, that is the same.
>
>  Also, can in essence a  4-10GE-ITU/C  (4x10G C-band DWDM PLIM on CRS) do
>> the
>> same thing as SPA-1x10GE-L-ITUC (1x10G C-Band spa) on 12K (port capacity
>> put
>> aside)?
>>
>
> It's my understanding that they can.
>
>  Does this mean that I can have a single physical port (on a DWDM enabled
>> 7600/12K/CRS cards/PLIMs) carrying traffic at various speeds over
>> different wavelengths(BW totaling 10G for example for a 10G physical
>> port)?
>> For example, I can create  one channel with oc-12 speed over one
>> wavelength,
>> another channel with oc-48 speed on another channel and then bind those
>> channels to a sub-interface? Is this how this is done?
>>
>
> No, it's single wavelength at any given time, and it's 10G only, and it's
> single point to point link over that single DWDM wave. You can of course
> have multiple ports in your router and thus achieve multiple waves, but each
> port only outputs single wave.
>
>  With  IPoDWDM optical integration they talk about eliminating
>> transponders,
>> but I'm not sure what those transponders would do anyway, before they drop
>> traffic to an (RO)ADM?
>>
>
> A DWDM transponder converts your 1310nm light into C-band single wavelength
> light and might add Forward Error Correction (FEC), plus supplies the people
> who run the DWDM with an administrative interface to monitor, both the DWDM
> side and the local tributary side.
>
> With the above router linecards you basically put the transponder into the
> router so the router outputs the C-band light and does FEC, and then you put
> this light via a variable attenuator into the DWDM system without any
> further Optical-Electrical-Optical conversion.
>
> --
> Mikael Abrahamsson    email: swmike at swm.pp.se
>