With Telkom I was informed that in my area the fastest I can download is between 2-4mbps

+2 votes
I live in strubenvale, Springs.
How will this effect my connection if i opt for 20mbps?
asked Mar 23, 2015 in ADSL by Hannes

2 Answers

0 votes
Speeds available are subject to Telkom infrastrcuture. If the quality of cabling or limitations on the physical exchange prevents speeds higher, changing ISPs will not usually allow higher speeds, unless there is a possibility of getting a higher speed and this has not been managed properly.

There are still many areas which are limited to speeds lower than 20Mbps. Although Telkom do allow 20Mbps service on ADSL2+, this is only available in a select few areas and if Telkom are reporting that you can only get between 2Mbps and 4Mbps, the chances are that you are either far from the exchange, or the infrastructure will not allow higher speeds.

You can check you area by visiting www.telkom.co.za/checkadsl but this will indicate the area capacity, not your individual line's capability.
answered Mar 24, 2015 by AfriMan (14,640 points)
0 votes

When your DSL modem connects to the DSLAM at the exchange, the DSL modem and the DSLAM figure out between them how long the telephone line is, and how much noise it is picking up.  From this, they work out how fast they can communicate.  The line attenuation is the resistance experienced by the signals your modem sends.  The longer the line, the more resistance there is.  It doesn't help to push up the voltage, since cooking pigeons that sit on your line, while fun, does not actually help the communication task.  The lower the signal level is once it gets to the other end of the line, the more atmospheric noise makes a difference.  Taken together, the further you are from the exchange, the worse your experience is going to be.

If your maximum speed is 2Mbps to 4Mbps, then your distance from the exchange is probably 4km to 5km.  Alternatively, telkom does not have ASDL2+ equipment at your exchange.  If you search for "adsl attenuation distance graph" you will find a number of graphs that all say this, e.g. this one.

If telkom says you can only get 2 to 4Mbps, best is to believe them.  If you order more, you're going to pay more, but you are going to get 2 to 4 Mbps.  If you are horribly unlucky, your modem will sync at a higher speed, but the connection will continually drop for no particular reason.  If you believe they have made an error, measure the distance (along the road) from your place to the exchange, and ask your neigbours what kind of ADSL speed they get. 

answered Mar 24, 2015 by Bananaman (5,390 points)