In the never ending search for bandwidth to allow multimedia data to be delivered via a telephone network or down a cable, instead of from a local storage device such as a CD-ROM, ISDN does leave a little to be desired. Whilst it does provide more services and a higher bandwidth, when compared with analogue telephone line and modem technology, unless primary rate is used, the data rates are not sufficient to support MPEG1 quality video and audio, let alone MPEG2.

In addition, the cabling is different from that used by an analogue telephone and therefore someone — usually the subscriber — has to pay for it. As a result, although ISDN has a definite part to play in providing data communications and video conferencing, especially in the ...

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