On Wed, 11 Feb 2015, Faisal Imtiaz wrote:
I was looking for feedback on the following question:-
When connecting two MM SFP/SFP+/XFP 's together...(short range).
What should be the best practice receive power range ?
SX (1G) / SR (10G) / SR10 (100G) gear generally has a receive threshold
that's higher than the maximum launch power. They are designed for
short-reach applications (in-building, data center, etc), so no
attenuation is needed.
Is it true that if the rx power is higher than (x?) then it shortens
the life of the optics ?
(assumption being made here is that MAX Rx Power is not being exceed as
per the spec sheets of the optics)
On short-reach optics, this should never be a problem. On long-reach
optics, receiver saturation will generally result in link errors/flaps,
and possibly high rx power warnings (depending on the gear on the
receiving end), however, these can be addressed using in-line attenuators.
On very long-reach optics, such as ZX (1G) and ER/ZR (10G), it is possible
to damage the receivers with too hot of a signal because they are designed
for long spans and a certain amount of distance-based attenuation is
factored into the optical power budget.
jms
