>> he other day i had 720 downstream and..... (drum roll).... 2880 upstream bitswaps in 1 hour...
TBH I really dont know for sure.. but Im unsure if it is excessive. Bitswapping happens so very fast. Bit swap is one of the first lines of defence in keeping a line stable and therefore I wouldnt be too surprised if a bitswap count far exceeds any error count on some lines on some occasions... I guess it depends on the individual line and the type of noise fluctuation?
Added:- just found
this
Eventually, depending on the speed of swapping (usually 20-100 swaps per second is a good number), the optimum 19.3 dB will be restored, although standards only mandate an ability to implement 1.25 swaps/second.
However, a vendor's modem can request swaps more frequently and if they are implemented by the other modem, profit from the increased speed of swapping. For 20 - 100 swaps/second, the new bit distribution in our example would be implemented in a couple of seconds without any bit errors or loss of service or additional errors (beyond those that occur for other reasons). This bit swapping process is seamless without errors, and without service interruption or need for retraining.
Even your highest figure is within the 1.25 swaps per second.
>> infact (i may be wrong) but as upstream is such a small amoutn of total bandwidth sitting on the strong part of the spectrum there should ZERO (or very little bit swapping)
Funny enough I suspect (but cant prove) that most of my bitswap occurs on my upstream - as my upstream SNRM is more variable than my down.
It would only take tiny fluctuations of SNR for bitswap to kick in, and if you have a few subchannels that constantly fluctuate (rather than a specific noise burst) it could materialise as lots of bitswaps but show no CRC or more serious type errors.
>> if your getting bit-swaps with it turned off...then it aint really turned off , also, if it were turned off then its likely your connection would just degrade and keep doing so until its unable to sync - bits/tones will become un-usable and will not be recovered because BS is turned off - i think anyway
Totally agree.
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Edited to add.
Dont know enough about this.. and Im out of time now and have to go out.
but a thought just occurred.. no doubt someone will correct me if Im wrong, but from scanning the link, its possible that low level cross talk could be causing the bitswapping?
This all be moot anyhow.