Dial-up

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  • Dial-up uses modems on the public switched telephone network (PSTN) using a plain old telephone service (POTS) line.
  • It has a maximum theoretical speed of 56 Kbps with the V.92 specification, although North American phone systems limited speeds to 53 Kbps.
  • Dial-up is too slow to browse the web, but it is extremely useful for out-of-band management of routers, switches, and other text-based network devices.
    • All you need is a phone line and you can dial in to the device.
  • You may ask why you need it, if you have an IP address configured on the device.
    • It is often used if the device loses connectivity from the Internet or network and is too far away to drive to. You can just dial in to troubleshoot it.
  • Dial-up is a backup control for network outrages since it uses the PSTN network for connectivity.