Title :
Simultaneous voice and data on the general switched telephone network using framed QADM
Author :
Bremer, Gordon ; Ko, Kenneth D.
Author_Institution :
Paradyne Corp., USA
fDate :
12/1/1996 12:00:00 AM
Abstract :
Considerable effort has been expended to allow voice to be transmitted over a general switched telephone network (GSTN) connection simultaneous with modulated data. A new transmission technology for this purpose is introduced-framed quadrature audio/data modulation (framed QADM)-in which voice and data channels are combined as an integral part of the modulation process. The basic technology is described and two implementations, which are at different levels of maturity for standardization within the International Telecommunications Union (ITU), are presented. Finally, system attributes are discussed for framed QADM as they compare to other technologies
Keywords :
audio signals; data communication; quadrature amplitude modulation; standardisation; switching networks; telecommunication channels; telephone networks; voice communication; ITU; International Telecommunications Union; QAM; audio signals; data channels; framed QADM; framed quadrature audio/data modulation; general switched telephone network; integrated voice-data transmission; modulated data; quadrature amplitude modulation; standardization; transmission technology; voice channels; Bidirectional control; Communication standards; Digital modulation; Modems; Quadrature amplitude modulation; Space technology; Standardization; TV; Telecommunication switching; Telephony;
Journal_Title :
Communications Magazine, IEEE
