Multiplex communications – Wide area network – Packet switching
Patent
1987-07-10
1989-02-28
Paschall, M. H.
Multiplex communications
Wide area network
Packet switching
370 60, 370 14, H04Q 1104
Patent
active
048092614
ABSTRACT:
A space and time switch receives digitized voice and/or data as twenty-two separate serial bit streams with each voice or data path occupying one time-slot on one bus, resulting in a total of 704 paths entering the switch. The switch originates twenty-two buses and the information in any incoming path can be switched to any outgoing path providing a 704-by-704 switching function. The switch includes six basic functional blocks: input, output, speech RAM, control RAM, controller interface, and state machine. The controller interface receives commands in the form of twenty-four bits appearing as three bytes in three separate operations, stores the bytes until all three are ready, and transfers the command bytes as a combination of address and data bits. The speech RAM stores a complete frame of the data transferred within each time-slot. The control RAM stores commands from the controller interface. The state machine controls operation of the functional blocks and controls readout of the commands from the control RAM, which become addresses for the speech RAM.
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Microelectronic Products Data Book, Issue 1, Mitel Semicodverter: pp. 2-15 through 2-32 MT 8980 Digital Time/Space Crosspoint.
Switch, issue 3, Jan. 1985; pp. 2-33 through 2-47 MT 8981 Digital Time/Space Crosspoint Switch, Issue 2, Jan. 1985.
Paschall M. H.
Solid State Systems, Inc.
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