Voice-Data Hybrid Transmission Systems in 64 kbit/sec Digital Lines

Julio SEGUEL  Yoshiaki TANAKA  Minoru AKIYAMA  

IEICE TRANSACTIONS (1976-1990)   Vol.E68   No.1   pp.22-28
Publication Date: 1985/01/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Switching Systems

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This paper describes the voice-data hybrid transmission facilities, which can be obtained by using 64 kbit/sec digital line. Instead of using separate transmission facilities for voice and data services, or instead of increasing the digital transmission rate, the silent portion of telephonic speech can be used to transmit the data. The line is available for the data transmission when a pause of the voice is detected, and the line is blocked for the data transmission during a talkspurt of the voice. Two models of the hybrid transmission system are shown. The first model, in which the data arrive randomly in bursts, is useful to describe a kind of interactive process. The second model, in which the data arrive continuously, describes file transfers, facsimile transmissions, etc. The necessary buffers, the blocking probabilities, the data delay, and other factors of both models are calculated.