dark fiber and sfp distance limitations

Sat Jan 2 16:08:35 UTC 2010

In my experience in leasing dark fiber strands over long distance the
providers usually give the option for regen colo space.  And in some
cases they wanted to know full specs of the equipment you are going to
be using so there is no questions if it will work or not.

Carlos Alcantar
Race Telecommunications, Inc.
101 Haskins Way
South San Francisco, CA 94080
P: 650.649.3550 x143
F: 650.649.3551
E: carlos at race.com

-----Original Message-----
From: Mike [mailto:mike-nanog at tiedyenetworks.com] 
Sent: Friday, January 01, 2010 2:53 PM
To: nanog at nanog.org
Subject: dark fiber and sfp distance limitations

I am looking at the possibility of leasing a ~70 mile run of fiber. I 
don't have access to any mid point section for regeneration purposes, 
and so I am wondering what the chances that a 120km rated SFP would be 
able to light the path and provide stable connectivity. There are a lot 
of unknowns including # of splices, condition of the cable, or the 
actual dispersion index or other properties (until we actually get 
closer to leasing it). Its spare telco fibers in the same cable binder 
they are using interoffice transport, but there are regen huts along the

way so it works for them but may not for us, and 'finding out' is 
potentially expensive. How would someone experienced go about 
determining the feasibillity of this concept and what options might 
there be? Replies online or off would be appreciated.

Thanks.