[c-nsp] 10GBase-LR and 10GBase-LRM compatibility

[Jeremy Bresley]

Can't seem to find a definitive answer on this anywhere so I figured I'd
throw it out here.

We've got some new routers (ASR-9001s) with 10GbaseLR optics in them.
(Data sheet for these only mentions supporting SR/LR/ER/ZR optics.)
We've got an existing pair of 4948E's with some available 10GBaseLRM
optics in them.

Can we connect these together with a short single-mode jumper and get a
stable link, if so does the LRM receive side possibly/probably need
optical attenuators on it to keep it from over-driving the optics?

We'd obviously like to avoid spending another $16K list to buy 4 new
SFP-10G-LR optics for the other side if they're not needed. :-)

Thanks for any feedback on this, as you can guess, searching for terms
like "10GBase-LR 10GBase-LRM compatibility" leads to a lot of links to
buy compatible optics, but nobody seems to say "yes this works" or "this
will fry it if you try"

Jeremy "TheBrez" Bresley
***@brezworks.com
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[Justin M. Streiner]

We've got some new routers (ASR-9001s) with 10GbaseLR optics in them. (Data
sheet for these only mentions supporting SR/LR/ER/ZR optics.) We've got an
existing pair of 4948E's with some available 10GBaseLRM optics in them.
Can we connect these together with a short single-mode jumper and get a
stable link, if so does the LRM receive side possibly/probably need optical
attenuators on it to keep it from over-driving the optics?

I suspect trying to connect an LR to an LRM wouldn't work very well. My
main concern would be the receive side of both optics not being able to
recover enough of the light if a singlemode patch is used.

It might work, but I would suspect that if you got into trouble and needed
to call TAC, they would tell you that the link is built in a way that
isn't supported.

You won't blow anything up, but the link might not be stable or
error-free...

Would 10GBASE-SR optics with OM3/OM4 patches be an option for you? That
would cost a lot less than 4 more LRs.

jms
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[Nick Hilliard]

Post by Jeremy Bresley
We'd obviously like to avoid spending another $16K list to buy 4 new
SFP-10G-LR optics for the other side if they're not needed. :-)

if you're paying more than $200 per LR SFP+ transceiver, you're being
fleeced. No idea whether you can connect LR to LRM, but given that LRM is
a pretty horrible hack, you may want to consider using standard LR optics
anyway.

Nick


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