[c-nsp] Gbic (old form) for 120KM

[Mikael Abrahamsson]

On Tue, 10 Jul 2012, Juan C. Crespo R. wrote:

> Does any one could advice me some Gbic for 3508/3550 (old form non sfp) 
> for 150Km?

Topic says 120km, text says 150km, what is it? Or more importantly, what 
is the total fiber attenuation on the path? For gig, chromatic dispersion 
is not a big issue at these lengths, so you're basically only limited by 
attenuation. There are GBICs (I've used such ~10 years ago) that are rated 
for 120km, from memory they had around 29-31dB attenuation tolerance which 
with "ideal" fiber attenuation at 0.2 dB per km gives 150 km reach.

If I remember correctly (aided by some googling for <finisar 120km gbic>) 
I'd say the ones we used were called FTL-1519 but I can only find 80km 
variants of this, so I guess you should look at the CWDM type called 
FTL-1619 which are 120km with more specific output frequency (get 1550 as 
this has the lowest attenuation per km)

<http://www.memoryx.net/ftl161955mt.html> are not the original ones but 
they do seem to offer 14 day free return so you can try them.

<http://www.finisar.com/products/optical-modules/gbic/FTL-1619-xx> for the 
original item.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se