Access switches for large ATM networks

Details Access switches for large ATM networks Access switches for large ATM networks

1993-12-20

1995-09-19

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 942, H04L 1256

Patent

active

054522978

ABSTRACT:
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 being selected from the PCM data streams because they have a common destination. The cells are transmitted over ATM virtual paths, each path transmitting one cell every 125 .mu.s. The ATM signals are switched by units for switching cells (cell switching), while keeping their payload contents intact, and by units for switching the signals for individual voice connections between cells of an ATM signal (cell remapping). 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. Advantageously, large telecommunication networks can be implemented using a small number of switching units.
Advantageously, an access switch comprising a cell mapping or distribution stage for assembling cells comprising PCM samples headed for a common output of the access switch are switched in a cell switch to a cell remap unit for collecting PCM samples headed for a common destination into individual cells of an ATM output stream, provides output signals that can be readily and efficiently switched by a transit network for distribution to other access switches of a large network.

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K. Y. Eng et al., "A Framework For A National Broadband (ATM/B-ISDN) Network", International Conference on Communications ICC '90, vol. 2, Apr. 1990, Atlanta, pp. 515-520.
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.

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