Multiplex communications – Wide area network – Packet switching
Patent
1980-05-29
1982-07-13
Chin, Tommy P.
Multiplex communications
Wide area network
Packet switching
370 70, 370 76, 179 2EB, 179 84B, H04J 106
Patent
active
043398162
ABSTRACT:
A conferencing apparatus for an FDM communications system employs a first available sideband for communication and a second sideband for signaling. Each subscriber in the system has dual receiving and transmitting equipment which enables a subscriber to communicate with any other subscriber. During such communication, a memory at each subscriber location may receive the frequency pair of one subscriber in a connection. Another subscriber desiring to be conferenced will receive the stored frequency pair from the subscriber who is not on proper frequency. This is implemented by a standby receiver and transmitter associated with each subscriber. Upon receipt of this information, the new subscriber can then tune his equipment to store the frequencies as received to enable the new subscriber to be incorporated in a conference mode. The received frequencies are also stored in the new subscriber memory and hence, any additional subscribers contacting parties to the conference will receive information regarding the elected subscriber who is communicating on his properly assigned frequencies to thereby enable a plurality of new subscribers to join in the conference.
REFERENCES:
patent: 3809815 (1974-05-01), Reed
patent: 3809816 (1974-05-01), Reed
patent: 3864521 (1975-02-01), Delong
patent: 4031327 (1977-06-01), Butin
patent: 4107471 (1978-08-01), Reed
Chin Tommy P.
International Telephone and Telegraph Corporation
O'Halloran John T.
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