On Fri, Jan 01, 2010 at 02:52:33PM -0800, Mike wrote: > 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.
That shouldn't be too difficult, especially at only 1G (though pesonally I can't imagine why you would bother leasing dark fiber for that :P). There are several ways you could do it, including 120km+ rated SFPs (iirc there have been 200km SFPs out for a while too), an external optical amplifier (ideally you'd want to amp in the middle, but with a single channel you should be fine w/pre-amp), and a digital FEC wrapper to extend the receive sensitivity. Remember that the distance spec on optics is mostly a rough guideline, so depending on the fiber conditions and number of splices/panels along the way you could potentially expect to get the entire distance out of a "standard" 100km optic. -- Richard A Steenbergen <r...@e-gerbil.net> http://www.e-gerbil.net/ras GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
