Lots & Lots of CRC Errors Upstream....

T

TheBossMan

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Anyone wants some upstream CRC errors ??? I have lots of them I wanna get rid of.... :mad: :sick:

Anyone has any idea what could cause massive amounts of Upstream CRC error??
I get massive amounts of them 40000 - 60000 and even more.. Just by refreshing the router page it goes up by a few hundreds or allmost 1000.

Internet goes to a crawl.. Even sometimes when it's not too bad, they still go to high for my liking...


I tried many new filters, 2 different routers. The 1 router I bough 2 - 3 weeks back...
Phone line sounds crystal clear no more noise like January.. No idea what could be causing all these CRC errors on upstream
 
Could you please post your sync speed, line attenuation and SNR margins?

You can try and reduce the MTU from 1492 to like 1000 and see that doesn't improve the performance slightly, but it is not something that you want to keep at that value for large downloads.
 
looking back at the problems we had last year. More or less the same problem. Huge cisco router, lines are clear and snr was all good, but we had crc errors.

Had the telkom techie's out several times but they kept saying nothing was wrong. Then got hold of a mweb techie and he said its all happening cause our exchange was congested.

Once telkom had completed their new Metro Ethernet Imax exchange, we were the first people on it(we asked for the lines to be transferred over) and all the crc errors stopped.

We had 3x4mbit lines but each line could only achieve around 400kbits(even though they were syching at 4mbit).

So i think it is a possibility that your exchange is congested.

ps: sorry for the long essay, i could have just said its the exchange that is congested. ;)
 
Connected true
Operational Mode G.Dmt
Annex Type AnnexA
Upstream 512000
Downstream 4096000
SNR Margin(Upstream) 14 dB
SNR Margin(Downstream) 15.5 dB
Line Attenuation(Upstream) 22.0 dB
Line Attenuation(Downstream) 43.5 dB
CRC Errors(Upstream) 65587 <---- Damm Errors :(
CRC Errors(Downstream) 0
Latency(Upstream) Fast
Latency(Downstream) Fast
 
You can try to switch to ADSL2+ modulation, but I have a suspicion that Prof.Merlin is correct about the saturated/congested exchange.
 
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