CRC error rates

Hey there,

Just a question, I am wondering if anyone has any guidance on what a good, average and poor range would be for CRC errors?

Any help appreciated!

It might be worth doing a search through the forums for error rates (e.g. search for posts with CRC, HEC, FEC). Quite often you'll get a complete set of data from a router including sync rates and router up time. The post context will usually indicate whether the line is (subjectively) thought to be good, average, or bad.

was only a very recent post here on the subject, there is no figures to give you as the answer depends on the router you are using, what your line condition is and ultimately how your connection performs.

zero would be good.

Nice idea, I will put that together tonight!

Cheers,
Aslan
DSL broadband, dsl isps, and DSL modem advice
www.adslgeek.com

- I agree that the rate should be as low as possible and to be perfectly honest, anything over 0 is typically an indication of an issue and they can typically be seen from the other modem router settings (eg SNR, Attenuation/distance etc) but it is a good indicative tool I think.

Possibly it is a 0 = good, 0-100 in 24 hours indicates a problem and higher than 100 generally indicating a physical layer issue (or sometimes the modem is having difficulty with a protocol eg

- from what I have seen is generally the rate will be very low, and then thousands in a short space of time. And typically for a good reason.

Cheers,
Aslan
www.adslgeek.com (DSL, dsl modem, ISPs and all things broadband)

well from what I have seen here and other dsl sites, users with the best of lines ie. sub 20db attenuation still have more than 0 crc errors but very litle maybe 10-100 crc errors over the course of a week.

Users on long lines typically will get much more even with interleaving and as such its just accepted as been normal providing the connection isnt suffering packet loss and loss of synch as a result of it.

Good call.

I will go through the forum and get the consensus on what actual results I can see, and I will try to see if there are any trends between distance, SNR, or modems and then try to work out a formula to take that into account.

So the vote so far from my side would be

CRC errors per week:
0 - 10 - Excellent
10 - 100 Good
>100 Poor (though often an indication/result of distance, noise or a poor modem)

Does that sound about right?

It may be right. It doesn't feel right.

As a first stab for a week I'd guess

Good <1000
Fair <=50,000
Poor >50,000

Depends a lot on when they happen, averaging out over a week could avoid the fact that 10,000 happened in a one hour window which would be really bad.

There is no fixed figures, you get a feel for these in combination with all the other data for a line.