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Heat Maps and ADSL Speed

It's been a little whlie since the last update. Interesting things have been happening with the state of broadband rollout in South Africa. With the latest version of the checker, Telkom seem to have changed the way they report ADSL speeds. As noted in a previous post, the checker now reports ADSL speeds rather than the maximum speed an exchange reports.

From our understanding of the data Telkom are now doing one of the following:

  • Providing an estimate of speed based on the physical location the phone number maps to
  • Being convervative with regards to ADSL estimates

In the first case this would involve a calculation based on the distance of the premise from the exchange. Based on the DLSAM in the exchange and this distance Telkom could estimate what speed you would receive. In the second case, Telkom could be basing the speeds on the existing sync speeds achieved by users in that exchange. It is up to the reader to decide what they think is happening.

For those of you with keen eyes, this explains the discrepancy between an exchange being reported as 10Mbps enabled but dispaying a max ADSL speed of less than 10Mbps, for example [1].

ADSL Enablements

Though it has become trickier to determine what speed each exchange supports it is still possible to see which exchanges are enabled or not. Over the last 4 months, 5 new exchanges have been enabled for ADSL. This brings us to roughly 50% (987) of exchanges enabled [2].

Heat Maps

About a year ago we launched a set of heat maps with the state of ADSL rollout [3]. So what has happened in the last year? Checkout [4] for the new maps.

ADSL Heat Maps (Click image for larger)
ADSL Heat Maps

- The BBZA Team

[1] PINELANDS (WPNN01) Exchange
[2] Recent ADSL Enabled Exchanges
[3] Maps May 2011
[4] Maps May 2012

Posted 2012-05-17 15:09:17 by Ian Saunders
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