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

Wed Jul 11 04:04:25 EDT 2012

Hi Juan

Take a look at www.smartoptics.com - I've used them by the hundreds for many years without any problems.
http://smartoptics.biz/wp-content/uploads/2011/02/SO-GBIC-L120-Cxx-R1.2.pdf

As Mikael said, you need to look at the total attenuation.
I've tested many of the transceivers and they have a fair safety margin (some 20%).. 

Ulrich 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mikael Abrahamsson
Sent: 11. juli 2012 07:44
To: jcrespo at ifx.com.ve
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Gbic (old form) for 120KM

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
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