dark fiber and sfp distance limitations

Mikael Abrahamsson swmike at swm.pp.se
Sat Jan 2 10:58:14 UTC 2010

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 at swm.pp.se

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