Multiplex communications – Wide area network – Packet switching
Patent
1984-06-18
1986-07-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 31, H04L 514
Patent
active
045997195
ABSTRACT:
Half-duplex switched carrier operation is emulated in a full-duplex voiceband data transmission system by utilizing predetermined signal indications in each channel to signal the initiation and termination of user data in that channel and thus to control the Receive Line Signal lead extending to the terminals at respective ends of the transmission channel. The signal indication which signals the initiation of transmission is illustratively two scrambled spaces inserted into an idle-state sequence of continuous scrambled marks. The signal indication which signals the termination of transmission is illustratively a stream of 65 unscrambled marks.
REFERENCES:
patent: 4110560 (1978-08-01), Leary et al.
patent: 4214123 (1980-07-01), Dagnelie
patent: 4232318 (1980-11-01), Becker et al.
MultiTech Systems brochure, "The New MultiModem 224," Nov. 11, 1984.
F-Tec brochure, "4848 Modem", Oct. 11, 1984.
Concord Data Systems, Inc., "Installation and Operation Manual-224 Data Modem," Dec. 1982.
Breen Robert N.
Day, II Robert A.
Lawrence Victor B.
Zboray Michael R.
AT&T Information Systems Inc.
Olms Douglas W.
Rokoff Kenneth I.
Slusky Ronald D.
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