IDSL
IDSL makes use of the ISDN 2B1Q encoding method but for permanent (or always-on) connectivity, unlike ISDN that enables dynamically initiating/terminating the connection. IDSL allows for the use of the D channel along with the 2 B channels of ISDN and, hence, can achieve the bandwidth of 144 kbps.
The maximum achievable bandwidth for IDSL is 144 kbps in both directions, and it is symmetric. IDSL is repeatable (which implies that you can have a repeater in the loop to amplify the signal), so it can be offered at longer distances where ADSL usually cannot be offered. Because of this distance advantage over ADSL, IDSL has become an attractive option for regions where ADSL can’t be offered and the subscribers want to take advantage of high-speed ...
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