Mailing List Archive

On Thu, Nov 13, 2003 at 02:45:46PM -0800, joe mcguckin wrote:
> Ignoring link budget issues, will these PICS work with each other?

No. Different wavelenght.

Look at:
http://www.juniper.net/products/ip_infrastructure/modules/100044.html#specifications

LH: 1480-1580nm
LX: 1270-1355nm


Regards,
Daniel

Yes, but generally speaking, receivers are sensitive to a wider range of
frequencies, not just the narrow range emitted by the laser in the
transmitter.

According to OCP's datasheets, the modules used by Juniper have a RX
frequency range of 1100 to 1600nm.

Joe




On 11/13/03 3:18 PM, "Daniel Roesen" <dr@cluenet.de> wrote:

> On Thu, Nov 13, 2003 at 02:45:46PM -0800, joe mcguckin wrote:
>> Ignoring link budget issues, will these PICS work with each other?
>
> No. Different wavelenght.
>
> Look at:
> http://www.juniper.net/products/ip_infrastructure/modules/100044.html#specific
> ations
>
> LH: 1480-1580nm
> LX: 1270-1355nm
>
>
> Regards,
> Daniel
> _______________________________________________
> juniper-nsp mailing list juniper-nsp@puck.nether.net
> http://puck.nether.net/mailman/listinfo/juniper-nsp
>

On Thu, Nov 13, 2003 at 04:10:07PM -0800, joe mcguckin wrote:
>
> Yes, but generally speaking, receivers are sensitive to a wider range of
> frequencies, not just the narrow range emitted by the laser in the
> transmitter.
>
> According to OCP's datasheets, the modules used by Juniper have a RX
> frequency range of 1100 to 1600nm.

Apparently the receivers range is wide enough that they will actually link
and pass packets. I know someone who successfully accomplished this with
the "air attentuation" technique (aka not pushing the fiber in all the
way). I've been known for a lot of ghetto fabulous stuff in my day, but
that one was over the top for me. :)

--
Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)

On Thu, Nov 13, 2003 at 04:10:07PM -0800, joe mcguckin wrote:
> According to OCP's datasheets, the modules used by Juniper have a RX
> frequency range of 1100 to 1600nm.

Interesting... thanks for this.

Another issue that may arise is that the LH RX might be not sensitive
enought to receive a signal from an LX TX at the end of the LX range.
I'll leave it to others to do the budget maths and prove/disprove
my worries. :-)


Best regards,
Daniel