[c-nsp] Long range 10G ethernet?

[Asbjorn Hojmark - Lists]

Peter,

A Cisco-branded 10Gbase-ZR X2 actually has a power budget of (at least) 24
dBm @ 1550 nm[1]. Get the fiber cleaned, re-spliced as you suggest, and
(re-)tested (to also check for dispersion). It's likely to work just fine. 

I have a couple of customers running 'grey' links at significantly more than
24 dB, and while that's not something I'd normally suggest or consider best
practice, there really is a pretty good chance that it'll work just fine.

[1]
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6574/product_dat
a_sheet0900aecd801f92aa.html

-A
PS: Be careful if testing them in a lab. You *will* toast them if not using
attenuators.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: 16. maj 2012 11:19
To: cisco-nsp
Subject: [c-nsp] Long range 10G ethernet?

(On 6500/Sup720 and with LAN cards)

We're currently using a gigabit link with a total loss of 24.1dB (at 1510
nm) from end to end. We're using some third party "120 Km" transceivers, and
this is working well.

Now we're thinking about making it a 10G link instead. Finding 10G
transceivers capable of supporting at least ~24-25dB seems tricky though.
Googling a bit reveals something like the Optospan SPP-81D-K080T31, rated
for 25dB at 1310nm. Of course we're primarily using X2 transceivers, and
that one is an SFP+.

[snip]