What Does IDSL Stand For?

ISDN Digital Subscriber Line (IDSL) makes use of ISDN technology for providing data communication across existing copper lines. It is ideal for those who cannot avail DSL facility in their area. Though it functions using ISDN technology, it primarily uses DSL equipment and as a result the connection speed increases to 144 kbps, which gives the benefit of higher speed. The superiority of IDSL is that it transmits data through a data network and not over the phone company’s voice network and calls are billed at a flat-rate. IDSL was developed by Ascend Communications.


In IDSL, digital data is transmitted at 128 kbps using the normal twisted pair telephone lines and during the process the telephone company’s central office equipment is bypassed. IDSL is a dedicated service.


The main advantage in using IDSL is that it offers a constant stream of data in areas where the signal quality is not good and it is used in conjunction with newer forms of data transfer. It is also more reliable means of transferring information using cable and is not susceptible to interference like regular DSL. It offers a full suite of call making services such as call conferencing, call forwarding and call barring for free and is also much cheaper than DSL. The advantage that IDSL provides over ISDN is that it offers a hand-on connection and transmits data using a data network than the carrier’s voice network.


The disadvantage of IDSL is that its customers cannot access ISDN signaling or voice services. As a service, it is available only in certain countries. IDSL makes use of the ISDN grad loop without using the basic rate interface in ISDN transmission mode. It is also a little more expensive to setup than DSL and is beneficial more to business organizations that need faster servicing, without using DSL.




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