Thread: 50M What can cause this intermittent power level fault
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Old 03-06-2012, 11:42   #33
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Re: What can cause this intermittent power level fault
the most likely cause of this problem is one of two things.firstly it could be a 'rogue' piece of kit thats being switched on at different times of the day and causing 'noise' issues,if this is the case you would see it happening at pretty much the same times most days as we as users are habitual in when we use the internet (apart from those who have hubs/modems switched on all day and night of course).
secondly it could be a part in the amp in the cab thats creating the problem.here in the north west (ex nynex build) we have constant issues with whats called an F to KS,its a small part that feeds the RF on the forward path to the toner taps that your individual cables are connected to.(and similarly all the return path traffic goes back through it).
these create noise on the upstreams,in some cases they can actually 'knock' modems off (this includes set tops using the upstreams for on-demand).
you can chase this noise down the cascade but in a lot of cases when splitters are pulled and such like (to determine which way the noise is coming from),it just disappears and traffic returns to normal,or it just simply stops what its doing.
having said all this it seems strange to have taken so long to track it down (if indeed it is an F to KS causing the problem)
as i said thats with the ex nynex build/amps, im not sure what type of build yours is.
as a footnote,cardie is great for identifying SNR issues and what are called 'fixable/unfixable errors' but as an engineer trying to locate the problem it has to be occuring while your on the area.
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