[c-nsp] Cisco 7609, LR Transceiver for Short Distance Connection

Nick Hilliard nick at foobar.org
Fri Sep 10 10:46:48 EDT 2010

On 10/09/2010 15:21, Christopher.Marget at usc-bt.com wrote:
> The linked document (which you trimmed) specifically says that an
> attenuator is required for an ER link<20km (underscoring your point),
> but doesn't mention that requirement for the OP's LR link.

The patch cable length really doesn't matter.  What matters is the 
attenuation and ensuring that your received light level at each end is 
within the threshold of what's acceptable to the transceiver receiver port.


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