Understanding Adsl in SA

**Ichigo** · 26-03-2012, 12:06 AM

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

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/showthre...enuation-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

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:

Local:

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

Code:

International:

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 
Router

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

  3     9 ms     9 ms    10 ms  196.43.21.226 
DNS

  4     *        *        *     Request timed out.

  5    28 ms    28 ms    27 ms  196.43.10.130 
DNS

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

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

  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] 
Google's Website
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:

Speedtest.mybroadband.co.za/

Your Latest Results (Local)
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 (International)
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:

Speedtest-rba.isdsl.net

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.

**Ichigo** · 26-03-2012, 10:45 PM

Added colour (to make it look nicer) and added more information

**Ichigo** · 27-03-2012, 11:32 AM

Updated and changed a tracert

**Cicero** · 27-03-2012, 12:56 PM

Very nice bro, all in a neat package.

**Ichigo** · 27-03-2012, 01:28 PM

Originally Posted by markface

Very nice bro, all in a neat package.

Thanks for the nice compliment

**MOnk** · 27-03-2012, 05:15 PM

Originally Posted by markface

Very nice bro, all in a neat package.

That's what she said!

**Ichigo** · 27-03-2012, 05:27 PM

Originally Posted by MOnk

That's what she said!

lol very funny, I have updated with more info

**Vixremento** · 27-03-2012, 07:59 PM

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.

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?

**Ichigo** · 27-03-2012, 08:27 PM

Originally Posted by Vixremento

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?

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

**Vixremento** · 27-03-2012, 08:32 PM

Originally Posted by Ichigo

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

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).

View Poll Results: Who Find this

Thread: Understanding Adsl in SA

Thread Tools

Display

Understanding Adsl in SA and Troubleshooting Tools

Posting Permissions