Multiplex communications – Wide area network – Packet switching
Patent
1992-11-06
1994-07-05
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 942, H04L 1256
Patent
active
053274210
ABSTRACT:
In accordance with the principles of this invention, Pulse Code Modulation (PCM) signal streams are converted into Asynchronous Transfer Mode (ATM) cells for switching and transmission across a telecommunications network. Each cell carries one PCM sample of up to 48 different voice connections, the voice connections selected from the PCM data streams because they have a common destination. The cells are transmitted over ATM virtual circuits, each circuit transmitting one cell every 125 .mu.s. Advantageously, ATM transmission systems interface with PCM systems without adding appreciable delay and without requiring additional buffering. Advantageously, new voice paths can be established most of the time by using available slots in the cells of existing virtual paths. This application relates to arrangements for converting the PCM signal streams into ATM cells.
REFERENCES:
patent: 4967405 (1990-10-01), Upp et al.
patent: 4970721 (1990-11-01), Aczel et al.
patent: 5204882 (1993-04-01), Chao et al.
R. Hazell, editor, "Broadband Technology", Electrical Communication, vol. 65, No. 1, (Telecom 91), Oct. 1991, pp. 12-18--Broadband Technology, pp. 19-21--Evolution of Alcatel Exchanges.
K. Y. Eng et al., "A Framework For A National Broadband (ATM/B-ISDN) Network", International Conference on Communication ICC'90, vol. 2, Apr. 1990, Atlanta, pp. 515-520.
Hiller Thomas L.
Phelan James J.
Zola Meyer J.
AT&T Bell Laboratories
Chin Wellington
Ton Dang
Ulrich Werner
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