Multiplex communications – Wide area network – Packet switching
Patent
1989-04-04
1990-06-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, H04J 312
Patent
active
049378201
ABSTRACT:
Typically time multiplexed switches use an indirect addressing scheme where a set of data bits in a first addressable memory define addresses in a second addressable memory as part of a read function to time switch an output data stream previously stored in the second memory. In a situtation where there are less channels of traffic than there are potential addresses as defined by the number of bits stored in the first memory, the most significant bits can be used to define first and second ranges where the first range defines a set of data bits used for indirect addressing of traffic information and the second range can be used in a direct addressing mode to substitute the lesser significant bits of those stored in the first memory in place of traffic memory data bits when the stored most significant bits are detected to define the second range of data bits. Such an approach considerably simplifies the circuitry required to perform this additional multiplexing operation of signal data into the traffic data stream.
REFERENCES:
patent: 4330858 (1982-05-01), Choquet
patent: 4507781 (1985-03-01), Alvarez, III et al.
patent: 4750165 (1988-06-01), Champagne et al.
Hamann H. Fredrick
Hsu Alpus H.
Lutz Bruce C.
Olms Douglas W.
Rockwell International Corporation
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