Nothing is wrong with the fiber... Attenuation is good... Gbics specs says -23db as a limit of your sensibility ...i have tried to put bidi sfp+ 80km on this fiber and have -25dbi on other side( not connect) this module have -20dbi sensibility ... This scenario have a 4 channels... And i use 2 10gb channels... C21 and c22 on side A and c51 and c52 on side B....
Enviado via iPhone Grupo Connectoway > Em 22/04/2015, às 19:01, Evelio Vila <eve...@thousandeyes.com> escreveu: > > I think the OP is asking about whether it should account for chromatic > dispersion or not. Intramodal dispersion may very well be a limit on your > link even the power budget (as presented before) is fine. As Mikael said, I > would stick to the specs from the manufacturer for that specific module, or > rent an OTDR and make the measurements. > > -- > Evelio > >> On Wed, Apr 22, 2015 at 1:51 PM, Baldur Norddahl <baldur.nordd...@gmail.com> >> wrote: >> First: buy a power meter. They are really cheap and the only way to know >> for sure how much signal you got. It will also tell you how much launch >> power you have. The fiberstore modules are listed as 0 to +5 dBm launch >> power - if you got lucky it might be +5 and if you got a lower end module >> it might be close to 0. Obviously this makes a huge difference for how much >> power you get on the other end. Also it is said that the laser will lose >> power over time. >> >> Second you need to think in terms of power budget, not distance. So you got >> 68 km and the module is rated for 80 km - but not all fiber is not born >> equal. A power meter allows you to measure the true link loss. >> >> Third you did not tell what DWDM multiplexer you are using. A 44 channel >> DWDM multiplexer from Fiberstore can have up to 4.5 dB insertion loss. You >> might have two of those on your link for a total of 9 dB loss. Your 80 km >> module has a 23 dB link budget, so this leaves you with 23-9 = 14 dB >> budget. If your fiber has 0.25 dB loss per km, that is only 56 km. >> >> Regards, >> >> Baldur >
