[j-nsp] XFP-10G-L-OC192-SR1

[Paul Stewart]

Excellent.. same logic here - we need some short runs (same cabinet) and
have other runs that are within a building (151 Front in this case) ...
using same optics in all MX would be really nice. 

Appreciate it,

Paul


-----Original Message-----
From: Richard A Steenbergen [mailto:ras at e-gerbil.net] 
Sent: Thursday, March 24, 2011 11:17 AM
To: Paul Stewart
Cc: 'juniper-nsp'
Subject: Re: [j-nsp] XFP-10G-L-OC192-SR1

On Thu, Mar 24, 2011 at 08:07:57AM -0400, Paul Stewart wrote:
> Hi folks.
> 
> These are "10KM" optics - how short of a run can you use them for?  We 
> have several of these spared at the moment and I'd like to use them 
> for connections between MX480's in the same rack. will they run too 
> hot?

http://www.nanog.org/meetings/nanog48/presentations/Sunday/RAS_opticalnet_N4
8.pdf

See page 79. LR and below has no blindness danger even back-to-back, ER 
has a blindness danger but not a damage danger, and ZR you can actually 
damage if you don't have enough attenuation before going into the 
receiver.

We don't even bother with shorter reach optics, after way too many 
issues encountered with SR and the like. It's easier (and cheaper if you 
have the right sources) to just buy all LR and standardize on SMF than 
it is to bother maintaining two inventories and mucking with orange 
cables even for intra-rack stuff.

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)