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ISDN

Integrated Service Digital Network (ISDN) provides an entirely digital connection between your home and the phone company switch, so there is no loss of data in an analog-to-digital conversion. This allows you to get the full 64 kbps that the phone system uses internally for transmitting voice data.

An ISDN modem looks and acts quite a bit like an analog modem, but dials and connects very quickly (often in under 1 second) and makes no noise. It is possible to run a web server from ISDN and save connection fees by having your ISP dial your modem and set up a connection to a web server at your home when anyone surfs to a web page at your IP address. This adds a noticeable delay for the surfer, however, and is nontrivial to set up. ISDN is customarily provided as two “B” channels of 64 kbps each that can be bonded into one 128 kbps channel. There is no loss of start and stop bits because the connection is synchronous, so the actual throughput can be 16,000 bytes per second. Some telcos provide only 56 kbps B channels because they use one....


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