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Author Topic: Interpreting DSL Stats  (Read 193 times)

g3uiss

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Interpreting DSL Stats
« on: November 12, 2019, 04:16:12 PM »

Sorry for perhaps asking an ignorant question but can someone please explain the difference between the plotting of CRC and ES. I ask because Iíve had a thread on the ADSL forum for some time. I get a burst of CRC,s every day at 0919 Iíve long put this down to a timer ( recently perhaps proved as after the return to GMT they occurred at 0819 for a few days until the responsible person reset the clock, but a bit surprising at the accuracy of the reset)

When I get the CRC burst ( 1000) it results in a SNRM drop ( occasionally enough to resync) but few ES. Most of the rest of the time ES and CRC seem related in a fairy constant ration of 3:1 approx.

I canít do anything to source the cause, just interested in the plots and the few ES
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roseway

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Re: Interpreting DSL Stats
« Reply #1 on: November 12, 2019, 06:46:56 PM »

CRCs are monitored continuously (by default, per minute). The values shown in the CRC/minute graph are actual error numbers.

ES (errored seconds) are a count of seconds in which one or more errors occurred. So one ES could contain a single error or a large number of errors.

So it's quite possible (and fairly common) for a short burst of errors to rack up a large number of CRCs in a few seconds, and so very few ES.
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  Eric

g3uiss

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Re: Interpreting DSL Stats
« Reply #2 on: November 12, 2019, 08:45:15 PM »

Thanks Eric.

Appreciate the clarification

Tony
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Zen FTTC and Plusnet ADSL HG612 modems with Vigor 2925