Browse Prior Art Database

Modulation Identification Scheme

IP.com Disclosure Number: IPCOM000076058D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Beeseyre, JA: AUTHOR [+2]

Abstract

This is a method of tone signaling for connecting modems 1, 3, 5, 7 and 9, each of different type modulation (FAKE N Phase, FE) which terminate separate lines to modems 21 23 25, 27, 29 of corresponding type modulation at a remote station. The calling modem applies a voice frequency tone unique to its modulation type to the communications path 13 coupling the remote station. A filter arrangement 15 responsive to the tone, in turn activates a controller 19 for electrically connecting 52 a modem of the indicated modulation type to the communications path. The method can be extended to the use of polytonic signaling where two or more tones identify the requesting modulation type.

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Modulation Identification Scheme

This is a method of tone signaling for connecting modems 1, 3, 5, 7 and 9, each of different type modulation (FAKE N Phase, FE) which terminate separate lines to modems 21 23 25, 27, 29 of corresponding type modulation at a remote station. The calling modem applies a voice frequency tone unique to its modulation type to the communications path 13 coupling the remote station. A filter arrangement 15 responsive to the tone, in turn activates a controller 19 for electrically connecting 52 a modem of the indicated modulation type to the communications path. The method can be extended to the use of polytonic signaling where two or more tones identify the requesting modulation type. In this regard, it should be noted that in multiple-tone transmissions one of the tones may have a transmission line function, such as the disablement of echo suppressors.

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