Telkom South Africa’s ADSL performance indicators

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Telkom has released its latest ADSL Key Performance Indicators (KPIs), captured between 1 April 2009 and 6 July 2009. Telkom KPIs – a requirement of the ICASA ADSL regulations – were previously dogged by inaccuracies and mistakes, and the company moved from a fairly comprehensive set of results to a trimmed down version providing significantly less detail.

Three performance indicators form part of Telkom’s KPI reports: Packet Loss, Latency and Jitter. Each of these performance indicators are provided for Telkom’s national and international networks.

The international packet loss is measured and averaged over 5 international links to South America, Europe and Asia while national measurements and averages come from 9 edge service routers located at different exchanges throughout South Africa.

The same international links were used to measure latency while national round-trip times were measured and averaged over the same set of edge server routers used for packet loss measurements.

The international jitter was measured over 5 international links to South America, Europe and Asia while local measurements involved 9 edge services routers once again located at different exchanges throughout South Africa.

The results

Telkom’s KPI statistics may raise eyebrows from ADSL subscribers who may feel that the results are a theoretical exercise rather than representative of a real world ADSL experience. The latest stats are as follows:

International Key Performance Indicators

Average International Packet Loss (%) - 0.028

Average International Round-trip latency (ms) - 291.50

Average International Jitter (ms) - 1.27

National Key Performance Indicators

Average National Packet Loss (%) - 2.90

Average National Round-trip latency (ms) - 16.10

Average National Jitter (ms) - 3.76

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