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Re: SNR issue

I am working on the same issue in my system.
 
I have found that the incoming light level to the receiver in the headend made a major difference on the upstream SNR.   The equipment we bought didn't have very detailed performance graphing.   All it said was the optical input range for the receiver to work (+1 to -9).   I made up a mini node at the headend and tried different light levels to the receiver and watched the upstream spectrum for changes.   For my receivers, padding them down to about -6dBm input helped improved the upstream SNR by 10 dB.   At least on my receivers, going down any further on input light caused me to have a deficit in receiver gain.  (ie.   injecting 38dB at node, receiving 38dB at HE receiver)   All this of course assumes that all the other considerations listed in other posts are correctly accounted for. 

This proved to be true on a few live nodes that I re-optimized using this procedure.   Maybe you have already thought of this, but I didn't see it listed in the reply's so far.

Hopefully this helps in what you are trying to accomplish.

Jeff
This is CABL.com posting #320246. Tiny Link: cabl.co/mbvtq
Posted in reply to: SNR issue by 1FARMER
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