ADSL Speed Issue - 4MB

R

R4tt3xx

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Joined
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East Rand
I have recently have my line upgraded from 512k to 4MB, ever since then the net is behaving very strangely.

Pings are stable 100% stable all the time, even under "full" load. Problem is, I cannot obtain full transfer speed on the line. It is very annoying. The router reports a 7% CRC error rate, I have contacted both Telkom and my ISP, still waiting feedback.

Question is, is the 7% CRC error rate normal or is there a problem on the line ?
 
"CRC Errors can cause an end station to freeze. If a large number of CRC Errors are attributed to a single station on the network, replace the station's network interface board. Typically, a CRC Error rate of more than 1 percent of network traffic is considered excessive."

dont know what that means thou lol
 
Mr.Jax said:
What sort of speeds are you getting ?

425-450 Kbytes/s download (depends on what you use to measure) is your max on a 4mbps line.

www.speedtest.net results should max out at ~3.5Mb/s
Click to expand...

A local JHB speedtest 1.5 to 2.5mb/s, SAIX Cape Town times out, UK 0.08mb/s, USA same 0.08

Torrents fly, not at 4mb/s though, Youtube also works sort of, I can stream most videos most of the time.
 
R4tt3xx said:
I have recently have my line upgraded from 512k to 4MB, ever since then the net is behaving very strangely.
Pings are stable 100% stable all the time, even under "full" load. Problem is, I cannot obtain full transfer speed on the line. It is very annoying. The router reports a 7% CRC error rate, I have contacted both Telkom and my ISP, still waiting feedback.
Question is, is the 7% CRC error rate normal or is there a problem on the line ?
Click to expand...


Get them to turn your line speed down to 3MB and check it then. You'll very likely find you're back up to 0-1% CRC.

It's a pain in the butt that you wont get the 4MB and still pay for it but better to be slower and error free.

P.
 
Hmmm, yeah.

Rattex, what's your attenuation and Noise Margin stats like ?
ppedrick said:
Get them to turn your line speed down to 3MB and check it then. You'll very likely find you're back up to 0-1% CRC.

It's a pain in the butt that you wont get the 4MB and still pay for it but better to be slower and error free.

P.
Click to expand...
 
ppedrick said:
Get them to turn your line speed down to 3MB and check it then. You'll very likely find you're back up to 0-1% CRC.

It's a pain in the butt that you wont get the 4MB and still pay for it but better to be slower and error free.

P.
Click to expand...

Line speed was taken back down to 512, 512 was working 100%, 1MB,2MB and 3mb same issue.
 
R4tt3xx said:
Line speed was taken back down to 512, 512 was working 100%, 1MB,2MB and 3mb same issue.
Click to expand...

You should report this to Telkom to get them to send an engineer. Report the fault, saying that even at 1MB there are errors... at some point they might get aroud to fixing it.

However it works out... you souldn't be paying for the line until it's fixed.
 
I agree with ppedrick...push them hard to fix it. Now is a really good time to do that too. Seems that specially the telkom escalation centre is under loads of pressure to deliver (got a call yesterday and today to provide feedback wrt my experiences with them, some company doing a review/analysis of their performance etc....); so..they're performing better than usual at the moment :)
 
Test with all phones/faxes/modems/alarms unplugged off the line, even the filters for now. See how that looks. Sometimes too much capacitance (phone ringing circuitry, etc) can cause CRC errors. Sound never be above 7µF
 
Last edited:
Leftfoot said:
Test with all phones/faxes/modems/alarms unplugged off the line, even the filters for now. See how that looks. Sometimes too much capacitance (phone ringing circuitry, etc) can cause CRC errors. Sound never be above 7µF
Click to expand...

Nothing except for a POTS filter was connected to the line.
 
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