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

[Paul Stewart]

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?

The specs on the Juniper site show:

Transceiver model number XFP-10G-L-OC192-SR1

Optical interface Single-mode

Transceiver type XFP

Standard IEEE
802.3ae-2002

Maximum distance 9/125 SMF cable:
6.2 miles/10 km

Transmitter wavelength 1260 through 1355 nm

Average launch power -8.2 through 0.5 dBm

Average receive power -14.4 through 0.5 dBm

Receiver saturation 0.5 dBm

Receiver sensitivity -14.4 dBm

Thanks,

Paul

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[Tim Jackson]

They're fine to run back to back..

Average launch power -8.2 through *0.5 dBm*

Average receive power -14.4 through *0.5
dBm*

*Receiver saturation 0.5 dBm*

You'll never launch hotter than the max RX..

They usually launch @ -2 -> -3dbm..

--
Tim

[Paul Stewart]

Thanks Tim for making that much easier to understand ;) Appreciate it..

Paul

From: Tim Jackson [mailto:jacks...@gmail.com]
Sent: Thursday, March 24, 2011 8:18 AM
To: Paul Stewart
Cc: juniper-nsp
Subject: Re: [j-nsp] XFP-10G-L-OC192-SR1

They're fine to run back to back..

Average launch power -8.2 through 0.5 dBm

[Richard A Steenbergen]

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_N48.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 <r...@e-gerbil.net> http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)

[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:r...@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

[William Jackson]

We do something similar,

We pre installed all ports with SM optics and then used in the rack with
the router a fibre shelf using MPO connectors. From the fibre shelf we
buy premade MPO to LC breakouts and have the router prewired.

You can buy trunk cables that contain 12 MPO plugs and these each
contain 12 fibres, to wire to your fibre interconnect frame.

Then when service needs to be turned up don't need to touch the router
rack, just at interconnection frame ( where install relevant attenuators
).

Worked so far for us and save a lot of messing around.

Best Regards

William Jackson