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Aucbvax.4472 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Thu Oct 15 23:14:44 1981 bell, vadic, 212s, acoustic couplers >From csk@UCLA-Security Thu Oct 15 22:42:55 1981 There is no such thing as a 212 acoustic coupler!

Vadic invented the 1200 baud encoding system used today. However, when bell chose the 212, it chose a set of encoding frequencies (purposely) which have resonance problems which make it impossible to build acoustic couplers for the 212. Vadic remained with its own standard which DOES allow acoustic couplers. It is generally felt in the industry that the Vadic standard is superior to the Bell 212 standard.

At the computer end, buy Vadic triple threats and no one will be unhappy. At the user end, use whatever is convenient. I use a Vadic 3434 (acoustic coupled) and it works just great. However, expect problems with hotel and other places because of noisly lines, phones that don't fit, etc.

--charley kline

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