Multiplex communications – Wide area network – Packet switching
Patent
1993-12-20
1995-06-20
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 942, H04L 1256, H04L 1266
Patent
active
054266360
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, a central communications network comprising stages of cell remapping interconnected by one or more stages of cell switching provides flexibility for interconnecting large access switches; the cell remapping stage may be made part of the access switch.
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Hiller Thomas L.
Spanke Ronald A.
Stanaway, Jr. John J.
Wierzbicki Alex L.
Zola Meyer J.
AT&T Corp.
Chin Wellington
Ulrich Werner
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