Pulse or digital communications – Transceivers – Modems
Patent
1994-08-16
1995-09-19
Tse, Young
Pulse or digital communications
Transceivers
Modems
375220, 375377, 370 16, 34082503, 34082515, 34082551, H04B 100
Patent
active
054523290
ABSTRACT:
A modem device enabling a single communication line to be shared by a plurality of terminal units, and needing no switching operation between the terminal units on transmission. In transmission, when a transmission-start request is supplied from a terminal unit of any channel, the state of the other channels are checked. If these other channels are all in idle state, a channel selecting signal for selecting the channel corresponding to the transmission-start request is turned on so as to couple the corresponding terminal unit to a modem section for starting the transmission. In reception, on the other hand, upon receiving a call, priority calling channel information having been set in a predetermined mode register is read out to turn on a channel selecting signal for selecting the channel indicated by that information. As a result, a terminal unit of the channel corresponding to the channel selecting signal is selected to enable the receiving operation.
REFERENCES:
patent: 3633168 (1972-01-01), Dixon et al.
patent: 4040014 (1977-08-01), Gehrling
patent: 4045774 (1977-08-01), Morrison
patent: 4775983 (1988-10-01), Larimer
patent: 4782498 (1988-11-01), Copeland, III
patent: 5095494 (1992-03-01), Takahashi et al.
patent: 5128666 (1992-07-01), Munier et al.
European Search Report, Jun. 27, 1994, application Ser. No. 92 11 8457.
M. Culier, et al., "Serial Interface Between a Modem and a Data Multiplexing Box", IBM Technical Disclosure Bulletin, vol. 27, No. 9, Feb. 1985, pp. 5270-5271.
Sanyo Electric Co,. Ltd.
Tse Young
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