Multiplex communications – Wide area network – Packet switching
Patent
1983-03-15
1985-10-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04Q 1104
Patent
active
045450501
ABSTRACT:
To establish a conference connection between three participants in a TDM telephony system, use is made of the time-division switching stage which in many cases is already of a duplicated construction. The information signals (a, b, c) from the participants are written into corresponding addresses (AA, BB, CC) of two information memories while these addresses, after having been cyclically permuted, are written into the address memory associated with each of the information memories. When now the locations in the information memories are read in the sequence indicated by the address memories and summed thereafter, then each participant in the conference is supplied with a conference signal which is equal to the sum of the information signals of the two other participants in the conference connection.
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patent: 4274155 (1981-06-01), Funderbury et al.
patent: 4280216 (1981-07-01), Zeitrag
patent: 4387457 (1983-06-01), Munter
patent: 4425478 (1984-01-01), Van Mil et al.
patent: 4430734 (1984-02-01), Hubbard
Bohlmeyer Nicolaas
Hartman Johan E. A.
van Baardewijk Johannes
Briody Thomas A.
Eason Leroy
Kuntz Curtis
Olms Douglas W.
Streeter William J.
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