[c-nsp] Where do you put the optical attenuators? - Deepak Jain - net.nether.puck.cisco-nsp

8 messages in net.nether.puck.cisco-nsp[c-nsp] Where do you put the optical ...

From	Sent On	Attachments
Tassos Chatzithomaoglou	Oct 26, 2007 6:30 am
Justin Shore	Oct 26, 2007 6:49 am
neal rauhauser	Oct 26, 2007 7:00 am
John Souvestre	Oct 26, 2007 1:26 pm
Deepak Jain	Oct 26, 2007 1:34 pm
Dale Shaw	Oct 26, 2007 1:41 pm
Eric Van Tol	Oct 27, 2007 8:02 am
Jonny Martin	Oct 28, 2007 2:16 pm

Subject:	[c-nsp] Where do you put the optical attenuators?
From:	Deepak Jain (dee...@ai.net)
Date:	Oct 26, 2007 1:34:44 pm
List:	net.nether.puck.cisco-nsp

All of these are good ideas and points. What I'd suggest to the equation is if one side is more staffed/more manned/more accessible, its better to put your attenuators there. Cleaner is also a nice point to consider, but of course everyone keeps their connectors and environment super-neat, right?

neal rauhauser wrote:

Well, BOFH style, I would say you put them where you need them :-)

We had a problem with this last month - burned up a PA-POS-OC3 due to having it on only 800' of dark fiber. We bought 3dB through 15dB attenuators from Fiber Instrument Sales along with an inexpensive test kit ($1,000 or so) and then fooled around until we got what we wanted. We ended up with 7dB of input attenuation and 5dB of output.

Place the stuff where it makes sense - out of harm's way, which can be either at the device or at the patch panel. Get two of everything you use *including the fiber jumpers*. I've seen people with one critical oddball fiber jumper make a wrong move and then have *long* outages - this happened with one customer when the change from SC to LC connectors was just starting ...

Oh, and I don't have to tell you to document this, right? Use the system in place, and if the system is "ad hoc" print a couple single page copies of what was done and why, then laminate 'em and glue 'em to the wall in the appropriate location :-)

On 10/26/07, Tassos Chatzithomaoglou <achatz at forthnet.gr> wrote:

Does anyone know if in-line optical attenuator have to be connected on the receiver side only?

For example in the following link

A---------------------C SW1 SW2 B---------------------D

SW1 is transmitting through A and receiving through B SW2 is transmitting through D and receiving through C

Where is the best place to put the attenuators? B & C? Can i put them on A & B?

I did some tests putting them on every possible side (as long as there is one on each fiber strand) and all of them worked, but i was wondering if there is a best practice about them.

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