[167499] in North American Network Operators' Group
Re: CWDM question
daemon@ATHENA.MIT.EDU (Justin M. Streiner)
Fri Dec 13 13:44:36 2013
Date: Fri, 13 Dec 2013 10:12:34 -0500 (EST)
From: "Justin M. Streiner" <streiner@cluebyfour.org>
To: North American Network Operators' Group <nanog@nanog.org>
In-Reply-To: <52AA7C48.5050402@citywest.ca>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, 12 Dec 2013, Keith wrote:
> Fixed optics, there are no transponders, just a passive mux. No filters,
> though there is a pad on our side.
> Light levels on our side are good and within spec. I have been trying to find
> out from the SP what theirs
> are at presently, but when the circuit was first lit levels were taken and
> found to be within spec on both
> ends.
Another possibility is that the fiber you're using has higher attenuation
at 1471nm than at 1310. While 1471 is outside of the 'water peak' band
(E band - 1360-1460nm, centered at 1383nm, iirc), the type of fiber could
could still have higher attenuation that runs into the S and O bands.
If replacing optics doesn't solve the issue, you'll probably need a test
set that can test specifically at 1471 nm.
jms
