[120748] in North American Network Operators' Group
Re: dark fiber and sfp distance limitations
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Sat Jan 2 05:59:05 2010
Date: Sat, 2 Jan 2010 11:58:14 +0100 (CET)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: "Justin M. Streiner" <streiner@cluebyfour.org>
In-Reply-To: <Pine.LNX.4.64.1001011812150.18839@whammy.cluebyfour.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Fri, 1 Jan 2010, Justin M. Streiner wrote:
> The first thing you need to do is test the fiber with an OTDR. If you
> don't have one, you can probably contract a local cabling company to
> test it for you.
Why would you want an OTDR report on the fiber, when an attenuation report
is probably more accurate? OTDR is good for locating WHERE a problem is,
but if you're seeing .2 dB/km attenuation end-to-end, there is little
reason to break out the OTDR.
Also, for 1G there is little reason to worry about dispersion mentioned in
the thread, receive power is basically the only thing to worry about.
--
Mikael Abrahamsson email: swmike@swm.pp.se
