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What is ISDN?

ISDN is a digital dial up connection, and allows you to use the Internet and the phone at the same time, with speeds up to twice as fast as an analogue modem. Whereas traditional phone lines can carry data around 56 Kbps (Kilobytes per second) using a dialup modem, an ISDN line can provide two channels, each operating at 64 KBPS or a combined 128 Kbps.

Depending on the speed you require you can choose between two lines:  64 Kbps or 128 Kbps.

  1. If you only go online for short periods at a time, or to download emails, but require a faster, more reliable connection than normal analogue/ dial up.
  2. ISDN is more expensive than Analogue, but you can download more information in less time.

All you require to get connected is:

  1. a Telkom phone line:  if you do not have a Telkom phone line, you can contact Telkom at 10219 to order;
  2. to convert your line:  contact Telkom to either convert your current line to ISDN, or install an additional line;
  3. a modem:  an ISDN modem can be bought at any computer vendor and prices range from between R250 - R350 depending on the quality;
  4. an account with an ISP:  iSAT offers this service from only R99 per month.

ISDN pricing

R99.00 p/m
R179.00 p/m