Inconsistant performance of ADSL line.

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RazrWing

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Over the past 2 weeks or so I have had such inconsistant performance and speed from my 4Mbps Telkom ADSL line. I have the Telkom-supplied D-Link DSL-2750U router installed.

Ookla Speedtest can vary from 2.7Mbps downstream to less that 0.1Mbps with no activity on the network. I make sure to disconnect everyone except my own PC from the network.

ADSL stats from the router show the following:

Mode: ADSL_2plus
Type: ATM
Status: Up

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (dB): 155 205
Attenuation (dB): 365 180
Output Power (dBm): 0 -4
Attainable Rate (Kbps): 12584 1076
Rate (Kbps): 4096 507
D (interleaver depth): 1 1
Delay (msec): 0.25 0.24

HEC Errors: 0 10
OCD Errors: 0 0
LCD Errors: 0 0

Total ES: 24 0

Most of this is double-dutch to me, but common sense tells me that a) Attenuation is high and b) Outpuit power is not right. Ookla Speed test reported 2.7Mbps download and 0.36Mbps upload speeds under these modem stats.

Do I have a dickey modem/router here or is there a problem elsewhere?

Any advice would be much appreciated.
 
irBosOtter said:
Maybe change your mode from ADSL2+ to D.GMT to see if that helps
Click to expand...

Thanks irBosOtter, made the change and saw an immediate difference in the stats as per the below paste. Line seems a little bit more stable but performance is pretty much the same at 2.03 download and 0.37 upload. I would expect better from a 4Mbps line.

Mode: ADSL_G.dmt
Type: ATM
Status: Up

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (dB): 121 170
Attenuation (dB): 335 190
Output Power (dBm): 87 6
Attainable Rate (Kbps): 9376 1172
Rate (Kbps): 4096 512
D (interleaver depth): 1 1
Delay (msec): 0.13 0.25

HEC Errors: 0 34
OCD Errors: 0 0
LCD Errors: 0 0

Total ES: 84 0

Any other ideas would be welcome.
 
bekdik said:
Call 10210, DSL option and ask them to carry out a line test and a port reset.
Click to expand...

Thanks Bekdik, have done this on numerous occasions with only a brief (+/- 1 hour) improvement, then things go back to the old speeds.
 
What ISP are you on and have you tried different ISPs? Those SNR and attenuation stats look fine, shouldn't be giving you problems. Posting a tracert would also help, see if it is the exchange.
 
Sounds more like an ISP issue than a line issue.

BTW you want a HIGHER SNR and a LOWER Attenuation.
Therefore ADSL 2+ seemed to be better for you :) I'd rather have a higher SNR as it makes more of a difference than attenuation.
 
PsyCLown said:
Sounds more like an ISP issue than a line issue.

BTW you want a HIGHER SNR and a LOWER Attenuation.
Therefore ADSL 2+ seemed to be better for you :) I'd rather have a higher SNR as it makes more of a difference than attenuation.
Click to expand...

This.
 
Thanks for the suggestions Johnatan56, Telkom is the ISP, and I dont have any accounts with other ISP's. Did a tracert to Google and got this output.

Tracing route to www.google.com [74.125.233.115]
over a maximum of 30 hops:

1 1 ms <1 ms <1 ms 10.0.0.2
2 53 ms 57 ms 56 ms ti-224-116-01.telkomadsl.co.za [105.224.116.1]
3 67 ms 53 ms * ti-228-0-06.telkomadsl.co.za [105.228.0.6]
4 59 ms 52 ms 53 ms ti-228-0-13.telkomadsl.co.za [105.228.0.13]
5 * 15 ms 14 ms 105.187.249.94
6 15 ms 15 ms 15 ms jb1-pr-01-te1-0.net.telkomsa.net [105.187.249.6]

7 15 ms 18 ms 29 ms jb1-google-gw.net.telkomsa.net [105.187.249.22]

8 16 ms 28 ms 15 ms 72.14.239.129
9 15 ms 16 ms 15 ms jnb01s08-in-f19.1e100.net [74.125.233.115]

Trace complete.

Do you see anything in these numbers?
 
Thank you Arthur, very helpful indeed. Time for your meds and bath was it?
 
That first hop is pretty high, so its a line/exchange issue. Does it get worse at the same time every day, about 5-6ish? If it gets worse at one point every day, post a tracert then, if the first hop is higher it will be exchange. Otherwise it looks like it could be a line/router/filter fault. Have you tried swapping out the POTS filter and swapping out the router with a friend to rule it out?
 
Thank you Ponder, for this marvelously (sic) insightful information.

Having supplied 2nd and 3rd level technical support for Unisys, Compaq and Hewlett-Packard enterprise solutions for 28 years, it's amazing that it never occurred to me to learn how to ask questions that "volunteers who take time out of their lives to answer questions" might actually answer.

Frankly, if these forums take so much of your time that you can only post crap like this, please remove yourself as a Super Grandmaster, and leave the question answering to those who actually make a meaningful contribution. Or is the title all you wish to attain?

Now go have a nightcap with your troll buddy Arthur and go to bed, its past 9pm!
 
Thanks Johnatan56, it is at about the same time every day, early evening. Will run a tracert next time its bad. I have swopped the router with a Billion unit I have here, but no difference.

I must admit that the POTS filter does look a bit dodgy. Where would I be able to get a new one? And what would be a reliable brand to look for?

Thanks again for the useful insights.
 
RazrWing said:
Thanks Johnatan56, it is at about the same time every day, early evening. Will run a tracert next time its bad. I have swopped the router with a Billion unit I have here, but no difference.

I must admit that the POTS filter does look a bit dodgy. Where would I be able to get a new one? And what would be a reliable brand to look for?

Thanks again for the useful insights.
Click to expand...

They were under R50 from a telkom direct store, just google it or use telkom's site to find one: https://secureapp.telkom.co.za/direct/public/shopFinder.do
 
Try disconnecting all analogue devices, remove pots and plug router directly into the phone line. If the problem persists its not pots. Pots is only required to act as low pass filter for analogue data.

Also plug phone directly into line and check for any noise. If there is it'd indicate a bad connection somewhere.
 
bekdik said:
Try disconnecting all analogue devices, remove pots and plug router directly into the phone line. If the problem persists its not pots. Pots is only required to act as low pass filter for analogue data.

Also plug phone directly into line and check for any noise. If there is it'd indicate a bad connection somewhere.
Click to expand...

Thanks, will remember that as well.
 
¿Qué?

I assume that you meant to type ".....you are THAT you don't have TO apply your own........."?

Do you actually have anything constructive to add to this thread, or will you simply continue to troll and nitpick?
 
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