Understanding Adsl in SA

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Ichigo

Ichigo

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Understanding Adsl in SA and Troubleshooting Tools

http://www.kitz.co.uk/adsl/equip.htm
contention.gif


G.Dmt (G.DMT full-rate ADSL expands the usable bandwidth of existing copper telephone lines, delivering high-speed data communications at rates up to 8 Mbit/s downstream and 1.3 Mbit/s upstream)
http://en.wikipedia.org/wiki/G.992.1

Adsl 2+ (The data rates can be as high as 24 Mbit/s downstream and up to 1.4 Mbit/s upstream depending on the distance from the DSLAM to the customer's premises)
http://en.wikipedia.org/wiki/G.992.5

Attenuation (is the distance from the exchange/dslam terminal to your house)
http://en.wikipedia.org/wiki/Attenuation

SNR (Signal To Noise Ratio)
The Further you are from the exchange the lower the SNR is by default and decreases/increases depending on your line sync speed, if your line is dropping the first thing you will notice is that your SNR is lower than 12.
http://en.wikipedia.org/wiki/Signal-to-noise_ratio

In Depth Description of what Attenuation/SNR is
http://mybroadband.co.za/vb/showthread.php/186156-Understanding-SNR-and-Attenuation-Rates

Yes Attenuation/SNR is the most important, it can still be improved by building a dslam/exchange near your house or your line can get moved to a closer dslam/exchange.

Attenuation & SNR are not always related to distance, there could be other factors at play.

Also changing to fibre optics will help when they add it to your residential area or business area

CRC Errors (is an error-detecting code commonly used in digital networks and to see if your ISP connection is dropping)
http://en.wikipedia.org/wiki/Cyclic_redundancy_check

Graph to check your adsl potential according to your line attenuation/distance from the exchange, results may vary depending on your SNR
ADSL_Line_Rate_Reach.gif


Tracert (Is a great diagonstic tool used to diagnose your adsl line for common exchange/DNS problems like congestion or slow connections to the DNS, also can be used to check international/local latency problems)

You can also use tracerts to check what latencies you may get to certain gaming servers

How to save a tracert on your drive
Code: 
 tracert [website] > Drive:\filename.txt
http://en.wikipedia.org/wiki/Traceroute

Code: 
[B][U]Local:[/U][/B]

Tracing route to [url]www.telkom.co.za[/url] [196.43.22.222]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  192.168.1.1 
[B]Router[/B]
  2     9 ms     9 ms     9 ms  *.telkomadsl.co.za [41.146.0.1] 
[B]Exchange/Dslam[/B]
  3    24 ms    24 ms    23 ms  196.43.39.166 
[B]DNS[/B]
  4    25 ms    26 ms    25 ms  rrba-ip-bssr-1-ge-2-48.telkom-ipnet.co.za [196.43.23.6] 
[B]DNS[/B]
  5    24 ms    24 ms    24 ms  nbsc-ip-bssr-1-atm-5-0-0-1.telkom-ipnet.co.za [196.43.23.30] 
[B]DNS[/B]
  6    27 ms    27 ms    28 ms  nbsc-ip-rcache-1-vif2.telkom-ipnet.co.za [196.43.22.222] 
[B]Telkoms Website[/B]
Trace complete.

Code: 
[U][B]International:[/B][/U]

Tracing route to google-public-dns-a.google.com [8.8.8.8]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  192.168.1.1 
[B]Router[/B]

  2    10 ms     9 ms     9 ms  dsl-146-0-01.telkomadsl.co.za [41.146.0.1] 
[B]Exchange/Dslam[/B]

  3     9 ms     9 ms    10 ms  196.43.21.226 
[B]DNS[/B]

  4     *        *        *     Request timed out.

  5    28 ms    28 ms    27 ms  196.43.10.130 
[B]DNS[/B]

  6    25 ms    25 ms    69 ms  rrba-ip-lir-1-gig-2-0-0-201.telkom-ipnet.co.za [196.43.33.5] 
[B]Telkom Main Exchange[/B]

  7   222 ms   220 ms   220 ms  lon-ip-dir-telecity-gig-1-0-2.telkom-ipnet.co.za [196.43.9.217] 
[B]London International Exchange[/B]

  8   222 ms   223 ms   221 ms  196.25.147.10 

  9   278 ms   253 ms   252 ms  209.85.255.86 

 10   259 ms   259 ms   258 ms  209.85.253.94 

 11   265 ms   262 ms   262 ms  209.85.243.33 

 12   266 ms   280 ms   289 ms  216.239.49.36 

 13   280 ms   269 ms   270 ms  209.85.255.118 

 14   266 ms   265 ms   241 ms  google-public-dns-a.google.com [8.8.8.8] 
[B]Google's Website[/B]
Trace complete.



http://speedtest.mybroadband.co.za/, http://Speedtest.net and http://Speedtest-rba.isdsl.net: are great tools for diagnosing problems like congestion or throughput problems.

You can also use the speedtests to check what latencies you may get to certain gaming servers

Code: 
[B]Speedtest.mybroadband.co.za/[/B]

Your Latest Results [I](Local)[/I]
Test conducted on 26 March 2012 10:33:40 PM
Download Speed: 3463 kbps (432.9 KB/sec transfer rate)
Upload Speed: 418 kbps (52.3 KB/sec transfer rate)
Latency: 61 ms

Your Latest Results [I](International)[/I]
Test conducted on 26 March 2012 10:36:26 PM
Download Speed: 1858 kbps (232.3 KB/sec transfer rate)
Upload Speed: 376 kbps (47 KB/sec transfer rate)
Latency: 429 ms



Code: 
[B]Speedtest-rba.isdsl.net[/B]

Start Time: 22:22:05
End time: 22:22:06
IP Address: 41.146.11.120
Download Size: 409600 bytes
Time Delta: 1.1366279125214 seconds
Download Speed: 352 KBytes/s
Line Speed: 2816 kbits/s

The best way to report a fault is to go into the Telkom Direct Store or 10210

Good info to know so you can improve your gaming latency and experience, so hope you find it useful.
 
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Awesome! Really informative. You know I had a play around with some of the settings on my router this weekend (however it seems that there was actually very little I could do - I'd like to think it's because I'm just stupid but I fear there really is nothing much really in my power) and I found that I understand (or at least understood before coming across this post) very little about the actual implementation details let alone the various settings that I could play with to make me think I could improve things.

Yes Attenuation/SNR is the most important, it can still be improved by building a dslam/exchange near your house or your line can get moved to a closer dslam/exchange.
Click to expand...
Tell me how!!! I would kill (well probably just dismember) to get a 10 Mbit/s connection going here but apparently my exchange only supports 6 and even though I asked them to "up" me I still sync at less than 4...funny how we clutch at pipe dreams?
 
Vixremento said:
Awesome! Really informative. You know I had a play around with some of the settings on my router this weekend (however it seems that there was actually very little I could do - I'd like to think it's because I'm just stupid but I fear there really is nothing much really in my power) and I found that I understand (or at least understood before coming across this post) very little about the actual implementation details let alone the various settings that I could play with to make me think I could improve things.


Tell me how!!! I would kill (well probably just dismember) to get a 10 Mbit/s connection going here but apparently my exchange only supports 6 and even though I asked them to "up" me I still sync at less than 4...funny how we clutch at pipe dreams?
Click to expand...

Can you post your line stats from your router so I can check if you can support 10 Mbit/s

Would also like to know if you using Adsl 2+ or G.dmt cause it makes a big difference
 
Ichigo said:
Can you post your line stats from your router so I can check if you can support 10 Mbit/s

Would also like to know if you using Adsl 2+ or G.dmt cause it makes a big difference
Click to expand...

Cool - I'd almost post naked pictures of my sister for a better connection (except I only have brothers).
Downstream rate: 3291 kbps
Upstream rate: 635 kbps
PPPoE pass-through: Enabled
ADSL Line

Status: Cable connected
Line mode: G.DMT.BIS
Maximum line rate: 3264 kbps (upstream)
Noise margin: 6.1 dB (upstream)
Line attenuation: 55.7 dB (upstream)
Output power: 18.1 dBm (upstream)

I've tried the line mode set to ADSL2+ (G.992.5) and it just keeps connecting with G.DMT.BIS (I currently have it set to "Automatic" though).
 
Vixremento said:
Cool - I'd almost post naked pictures of my sister for a better connection (except I only have brothers).
Downstream rate: 3291 kbps
Upstream rate: 635 kbps
PPPoE pass-through: Enabled
ADSL Line

Status: Cable connected
Line mode: G.DMT.BIS
Maximum line rate: 3264 kbps (upstream)
Noise margin: 6.1 dB (upstream)
Line attenuation: 55.7 dB (upstream)
Output power: 18.1 dBm (upstream)

I've tried the line mode set to ADSL2+ (G.992.5) and it just keeps connecting with G.DMT.BIS (I currently have it set to "Automatic" though).
Click to expand...

Which router you using cause your attenuation for upstream says you about 5km away from exchange so it will be hard to get much higher than you are now with g.dmt, since 635 kbps is max with that.

Once your exchange/dslam is enabled for adsl2+ you should better speeds

Tell them to make you 4 mbit/s you should get that fine with g.dmt. Can you pm me your telephone number to check if you exchange is 10 Mbit.

Does it show the Downsteam Noise Margin/attenuation anywhere so I can judge it better?
 
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Ichigo said:
Which router you using cause your attenuation for upstream says you about 5km away from exchange so it will be hard to get much higher than you are now with g.dmt, since 635 kbps is max with that.

Once your exchange/dslam is enabled for adsl2+ you should better speeds

Tell them to make you 4 mbit/s you should get that fine with g.dmt. Can you pm me your telephone number to check if you exchange is 10 Mbit.

Does it show the Downsteam Noise Margin/attenuation anywhere so I can judge it better?
Click to expand...

Sure thing (just don't call me at 2 AM trying to sell me some Avon stuff...hot steamy sex talk may work though provided you get your sister to do it!).
Sadly all I get is the single Noise margin entry and attenuation lines.
 
Vixremento said:
Sure thing (just don't call me at 2 AM trying to sell me some Avon stuff...hot steamy sex talk may work though provided you get your sister to do it!).
Sadly all I get is the single Noise margin entry and attenuation lines.
Click to expand...

You will need to phone telkom to find what Dslam/UMC you on and they will give you all the line stats also which is nice :D once you got all info from them pm me it.

Can you tell me your router name so I can see if its a good one
 
Valiant effort at winning the PS3. The tracert description aren't quite on the mark though. ;)

Ichigo said:
Can you tell me your router name so I can see if its a good one
Click to expand...
The spirits tell me its a Siemens Gigaset 762SX. :)

And the chances of him making 4mbps are slim to none.
 
HavocXphere said:
Valiant effort at winning the PS3. The tracert description aren't quite on the mark though. ;)


The spirits tell me its a Siemens Gigaset 762SX. :)

And the chances of him making 4mbps are slim to none.
Click to expand...

Thanks :D, what should I amend the description to, to make it more accurate

True but he may make it if its his router which is broken or line
 
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