dark fiber and sfp distance limitations

Nick Hilliard nick at foobar.org
Sat Jan 2 01:36:07 UTC 2010

On 02/01/2010 00:24, ML wrote:
> Pardon my ignorance in this area but is too much to ask for OTDR data
> before signing contracts?  In addition to data on the make of the fiber
> if you wanted to do xWDM in the future.

fibre grade / quality, absolutely.  otdr is difficult, because fibre
providers usually splice up a specific path for a specific order.  This
means that they cannot always provide the otdr without first going to some
trouble and expense.  So you may find yourself having to specify acceptable
attenuation limits in advance, then putting in an order and then getting
the otdr + accurate attenuation results after the order has been accepted.
Obviously, you assume some risk in terms of hoping that the optics that you
buy for the circuit will actually do the job.


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