Telkom South Africa’s ADSL performance indicators
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.
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