Telkom CTO Alphonzo Samuels recently discussed the company’s technology roadmap with investors, which included an overview of the company’s ADSL and VDSL services.
Samuels explained that the maximum speed of a DSL service is influenced by the copper quality/thickness and its length.
“The thickness of the copper cable determines the signal transmission loss per km, thus impacting on the maximum attainable speed for a given distance,” said Samuels.
The maximum attainable speed using DSL technologies also decreases as the length of the copper increases.
Many Telkom DSL customers wondered why they could only get a maximum speed of a few Mbps when their exchange is 10Mbps or even 40Mbps enabled.
The maximum speed is a product of three main factors: the quality/thickness of the copper, the length of the copper (distance from the exchange/MSAN), and the technology used.
The following graph and table provide an overview of the maximum DSL speeds attainable, related to distance and technology.