Multiplex communications – Wide area network – Packet switching
Patent
1990-09-21
1992-10-20
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 455 541, H04J 316, H04J 100
Patent
active
051576600
ABSTRACT:
A communication system including a plurality of portable terminal apparatuses each capable of calling a partner terminal apparatus via a radio channel and a plurality of fixed terminal apparatuses each being connected via an ISDN interface to a time-division switch and each being connectable to the portable terminal in which when two portable terminals having an established cell are respectively attached to two fixed terminal apparatuses arbitrarily selected, the state of the call is automatically transferred to the two fixed terminal apparatuses so that the speech can be achieved between the fixed terminal apparatuses without conducting another call establishing procedure.
REFERENCES:
patent: 4633463 (1986-12-01), Mack
patent: 4745632 (1988-05-01), Duffy
patent: 5040177 (1991-08-01), Martin et al.
Kuwahara Hiroshi
Sakamoto Yuji
Takikawa Kumiko
Tanabe Shirou
Tsukamoto Nobuo
Ghebretinsae T.
Hitachi , Ltd.
Olms Douglas W.
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