[c-nsp] Long range 10G ethernet?

[Mack McBride]

Standard cisco ZR optics (X2-10GB-ZR) should meet your needs if you can reduce the loss budget by .1 db (I am assuming the loss includes jumpers).
The average on ZR is about 26 db budget.  The minimum budget is 24 db.
The ZR optics generally work beyond the listed budget if you are ok operating 'out of spec'.

The OneX probably has a power limitation that prohibits using ER or ZR optics.
However it could just be software.

LR Mack McBride
Network Architect



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: Wednesday, May 16, 2012 3:19 AM
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+.

Questions:

1) Any general ideas about how to best run 10G on 25+dB stretch without external amplification? We'd like to avoid the extra complexity that would introduce.

2) We might cut ~1dB by splicing in a few places instead of patching, but we probably can't get below 23dB loss. Would using 25dB capable transceivers on a 23dB stretch be too bold for comfort?

3) Does the OneX converter support any SFP+? Or is it somehow locked to only support certain modules? Cisco[1] mentions only CU, SR and LR as supported. Any (electrical) reasons OneX couldn't support any kind of
SFP+? Should we count on being able to use e.g. the aforementioned
SPP-81D-K080T31 in a OneX in e.g. a 6708 or Sup2T port?

[1]: http://www.cisco.com/en/US/prod/collateral/modules/ps5455/data_sheet_c78-547521.html

--
Peter


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