Multiplex communications – Wide area network – Packet switching
Patent
1989-10-10
1991-03-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 370 851, 379202, 379 94, H04J 312, H04M 342
Patent
active
049982435
ABSTRACT:
A device for providing teleconference capabilities in an ISDN includes a first receiver for receiving a first signal representing a first message over a first ISDN B-channel. A second receiver receives a second signal representing a second message over a second ISDN B-channel. A receive mixer mixes the first signal with the second signal to produce a receive mixed signal. A local receiver receives a local signal representing a local message to be transmitted over the first and second ISDN B-channel. A first transmit mixer mixes the first signal with the local signal to produce a first transmit mixed signal. A first transmitter transmits the first transmit mixed signal over the second ISDN B-channel. A second transmit mixer mixes the second signal with the local signal to produce a second transmit mixed signal. A second transmitter transmits the second transmit mixed signal over the first ISDN B-channel.
REFERENCES:
patent: 4301531 (1981-11-01), Lubin
patent: 4656623 (1987-04-01), Dalby, Jr. et al.
patent: 4656625 (1987-04-01), Nojiri et al.
patent: 4661969 (1987-04-01), Butler et al.
patent: 4722082 (1988-01-01), Furuya et al.
patent: 4792800 (1988-12-01), Fujioka et al.
Hsu Alpus H.
Miller Jerry A.
Olms Douglas W.
Racal Data Communications Inc.
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