[c-nsp] Where do you put the optical attenuators?

[Deepak Jain]

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.
>>
>> --
>> Tassos
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