Patent US5452329A successfully refreshed from Google Patents.
US5452329A
Expired / Lapsed
US
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Modem device
Assignee: PHC Corp
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Filing: 1994-08-16
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Granted: 1995-09-19
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Expires: 2014-08-16
Abstract
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.
Inventors
- 👤 Tetsuo Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:55
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
A modem device having a plurality of channels, each channel being connected to only one respective terminal which is external to said modem device, and each terminal being operative to issue to its respective channel a communication-start requesting signal, said modem device comprising: a modulator/demodulator for modulating/demodulating transmission/reception signals; a selecting signal output means for monitoring communication-start requesting signals input from said plurality of channels, and outputting a channel selecting signal for selecting a channel through which one of the communication-start requesting signals has been input first; and a switch means connected to all of said channels for establishing a connection between the terminal coupled to the channel selected by said selecting signal output means and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means, wherein said selecting signal output means, when one of the communication-start requesting signals from another channel is input while any of said plurality of channels is selected and in use, outputs a corresponding channel selecting signal for selecting said another channel after the use of the channel is terminated.
Claim 2
Dependent Claim
181 words
A modem device having a plurality of channels, each channel being connected to only one respective terminal which is external to said modem device, and each terminal being operative to issue to its respective channel a communication-start requesting signal, said modem device comprising: a modulator/demodulator for modulating/demodulating transmission/reception signals; a selecting signal output means for monitoring communication-start requesting signals input from said plurality of channels, and outputting a channel selecting signal for selecting a channel through which one of the communication-start requesting signals has been input first; and a switch means connected to all of said channels for establishing a connection between the terminal coupled to the channel selected by said selecting signal output means and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means, wherein said selecting signal output means, when one of the communication-start requesting signals from another channel is input while any of said plurality of channels is selected and in use, outputs a corresponding channel selecting signal for selecting said another channel after the use of the channel is terminated.
Claim 3
Dependent Claim
154 words
A modem device having a plurality of channels, each channel being connected to only one respective terminal which is external to said modem device, and each terminal being operative to issue to its respective channel a communication-start requesting signal, said modem device comprising: a modulator/demodulator for modulating/demodulating transmission/reception signals; a selecting signal output means for monitoring communication-start requesting signals input from said plurality of channels, and outputting a channel selecting signal for selecting a channel through which one of the communication-start requesting signals has been input first; and a switch means connected to all of said channels for establishing a connection between the terminal coupled to the channel selected by said selecting signal output means and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means, wherein said selecting signal output means cancels the output of a corresponding channel selecting signal when said communication-start requesting signal is canceled.
Claim 4
Dependent Claim
154 words
A modem device having a plurality of channels, each channel being connected to only one respective terminal which is external to said modem device, and each terminal being operative to issue to its respective channel a communication-start requesting signal, said modem device comprising: a modulator/demodulator for modulating/demodulating transmission/reception signals; a selecting signal output means for monitoring communication-start requesting signals input from said plurality of channels, and outputting a channel selecting signal for selecting a channel through which one of the communication-start requesting signals has been input first; and a switch means connected to all of said channels for establishing a connection between the terminal coupled to the channel selected by said selecting signal output means and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means, wherein said selecting signal output means cancels the output of a corresponding channel selecting signal when said communication-start requesting signal is canceled.
Claim 5
Dependent Claim
133 words
A modem device having a plurality of channels, each channel being connected to only one respective terminal which is external to said modem device, said modem device comprising: a modulator/demodulator for modulating/demodulating transmission/reception signals; a memory means for storing priority channel data for determining which of said plurality of channels should be a priority calling channel; a selecting signal output means for reading out the priority channel data stored in said memory means when a calling indication from a communication line is supplied, and outputting a channel selecting signal for selecting a corresponding channel; and a switch means connected to all of said channels for establishing a connection between the terminal coupled to the corresponding channel and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means.
Claim 6
Dependent Claim
133 words
A modem device having a plurality of channels, each channel being connected to only one respective terminal which is external to said modem device, said modem device comprising: a modulator/demodulator for modulating/demodulating transmission/reception signals; a memory means for storing priority channel data for determining which of said plurality of channels should be a priority calling channel; a selecting signal output means for reading out the priority channel data stored in said memory means when a calling indication from a communication line is supplied, and outputting a channel selecting signal for selecting a corresponding channel; and a switch means connected to all of said channels for establishing a connection between the terminal coupled to the corresponding channel and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means.
Claim 7
Dependent Claim
25 words
A modem device according to claim 3, wherein said selecting signal output means is operative for setting the priority channel data in said memory means.
Claim 8
Dependent Claim
44 words
A modem device according to claim 4, wherein said selecting signal output means performs the setting operation when a predetermined request-to send signal is input under such a condition that neither the calling indication from the communication line nor an equipment-ready signal is supplied.
Claim 9
Dependent Claim
105 words
A modem device according to claim 3 wherein: each terminal is operative to issue to its respective channel a communication-start requesting signal; said selecting signal output means is further operative for monitoring communication-start requesting signals input from said plurality of channels, and outputting the channel selecting signal for selecting a channel through which one of the communication-start requesting signals has been input first; and said switch means is further operative for establishing the connection between the terminal coupled to the channel selected by said selecting signal output means and said modulator/demodulator in response to the channel selecting signal supplied from said selecting signal output means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |