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ISDN
The
integrated Service Digital Network is a digital method of using copper analogue phone
lines to increase bandwidth. Examples of this are ISDN 2 and
Home Highway. An ISDN line will normally consist of
2 x 64k channels. Each channel may carry voice or data
allowing up to 128k transfers if both channels are used for
data transmission.
The same line, using a conventional V90 modem has a
theoretical maximum of 56k, although in reality, 48k is the
norm - thus ISDN can be expected to be 3 times faster when
downloading than a conventional modem. |
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