Rate-Adaptive Digital Subscriber Line (RADSL) is a variation of Asymmetric Digital Subscriber Line

Asymmetric Digital Subscriber Line

Asymmetric digital subscriber line is a type of digital subscriber line technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. It does this by utilizing frequencies that are not used by a voice...

 (ADSL) technology. In RADSL the DSL modem adjusts the upstream

Upstream (networking)

In computer networking, upstream refers to the direction in which data can be transferred from the client to the server . This differs greatly from downstream not only in theory and usage, but also in that upstream speeds are usually at a premium...

 bandwidth to create a wider frequency band for the downstream traffic. Using this technique the line is more tolerant of errors caused by noise and signal loss.

As the frequency is adjusted, the upstream bandwidth may be markedly decreased if there is a large amount of line noise or signal degradation - this may reduce the upstream bit rate

Bit rate

In telecommunications and computing, bit rate is the number of bits that are conveyed or processed per unit of time....

 to as little as 64 kbit/s - the same speed as a single ISDN B channel

B channel

B channel is a telecommunications term which refers to the ISDN channel in which the primary data or voice communication is carried. It has a bit rate of 64 kbit/s in full duplex....

.

See also

• Digital subscriber line
  Digital Subscriber Line
  Digital subscriber line is a family of technologies that provides digital data transmission over the wires of a local telephone network. DSL originally stood for digital subscriber loop. In telecommunications marketing, the term DSL is widely understood to mean Asymmetric Digital Subscriber Line ,...
  
   (DSL)
• Single-Pair High-speed Digital Subscriber Line (SHDSL)