[c-nsp] XENPAK packet loss

[Mikael Abrahamsson]

On Tue, 16 Jun 2009, FF wrote:

> I thought Chromatic Dispersion is distance related. This is supposed

Yes it is.

> to be SMF-28 DSF, the optics are supposed to be 80km (XENPAK DWDM 1600
> ps dispersion tolerance). Do you need a DCU even when operating within
> that range? One of the links is only about 40-50km.

Well, you didn't say the links were DC or not, and you didn't say how long 
the link was. At 40-50km, CD is most likely not the cause of your 
problems.

According to some info I found, SMF-28 DSF still has 17.1ps/nm/km, meaning 
your 1600ps dispersion tolerance only gets you 94km? I might be wrong 
though, I can't get the whole article, google only displays from its 
cache.

> Is there a Cisco command to pull up the BER the optic is seeing?

No, on GE you can only see it by sending traffic and observing the error 
counters.

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