Multiplex communications – Wide area network – Packet switching
Patent
1988-02-29
1990-01-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 31, H04L 516
Patent
active
048978310
ABSTRACT:
A data communication apparatus includes a data communication section for preforming data communication according to full duplex communication, a testing section for performing a communication test prior to the data communication, and a transmission controller for determining whether full duplex communication can be performed during a period of the communication test performed by the testing section. The testing section includes a backward signal generator, a backward signal detector, and a control signal analyzer. The backward signal generator and the backward signal detector may be replaced with an echo canceller.
REFERENCES:
patent: 3956589 (1976-05-01), Weathers et al.
patent: 4351059 (1982-09-01), Gregoire et al.
patent: 4653044 (1987-03-01), Kudo
Kurahayashi Sadasuke
Negi Tsuneo
Nishii Teruyuki
Ono Takeshi
Sakamoto Masahiro
Canon Kabushiki Kaisha
Marcelo Melvin
Olms Douglas W.
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