US5303239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: Toshiba Corp
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Filing: 1991-03-26
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Granted: 1994-04-12
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Expires: 2011-03-26
Abstract
Abstract The telephone system comprises a central or key service unit 1, data terminal units 5 1 to 5 n , and data set circuits of data terminal interface units 27 1 to 27 n for communications between the central unit 1 and the data terminal units 5 1 to 5 n , respectively. The central unit 1 includes a time switch 17 for executing exchange service and a control unit 19 for controlling the time switch 17. Each interface unit 27 1 to 27 n is connected to the time switch 17for communication of communication-data and connected to the control unit 19 for communication of control-data. Each interface unit 27 1 to 27 n enables and disables communication of communication-data between each data terminal 5 1 to 5 n and the time switch 17 in response to predetermined control commands received from each data terminal unit 5 1 to 5 n .
Inventors
- 👤 Takashi Aoki
- 👤 Yoshikazu Sano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:35
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002; H04M9/008; H04Q; H04Q11/00; H04Q11/04; Y; Y10; Y10S; Y10S370/00; Y10S370/901; Y10S370/902; Y10S370/903; Y10S370/904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
309 words
A telephone system, comprising: central means having exchange means for executing exchange service, and exchange control means for controlling said exchange means; and interface means connected to said exchange means for communication of communication-data therewith, connected to said exchange control means for communication of control-data therewith, and connected to a data terminal unit for providing an interface for communication of said communication-data between said central means and said data terminal unit; said interface means enabling and disabling said communication of said communication-data between said central means and said data terminal unit in response to predetermined control commands included in a data stream received from said data terminal unit, and said interface means enabling and disabling said communication of said communication-data independently of operations of said exchange means in said central means, wherein said interface means transmits first control data to said exchange control means in response to a first control command from said data terminal unit indicative of a data communication start, transmits second control data to said exchange control means in response to a second control command from said data terminal unit indicative of a data communication end, disables said communication of communication-data between said central means and said data terminal unit in response to a third control command from said data terminal unit indicative of a data communication interrupt, and enables said communication of communication-data between said central means and said data terminal unit in response to a fourth control command from said data terminal unit indicative of a data communication restart; and said exchange control means controlling said exchange means so that communication of communication-data between said data terminal unit and another selected data terminal unit is maintained from a time when said first control data is received from said interface means to a time when said second control data is received from said interface means.
Claim 2
Dependent Claim
309 words
A telephone system, comprising: central means having exchange means for executing exchange service, and exchange control means for controlling said exchange means; and interface means connected to said exchange means for communication of communication-data therewith, connected to said exchange control means for communication of control-data therewith, and connected to a data terminal unit for providing an interface for communication of said communication-data between said central means and said data terminal unit; said interface means enabling and disabling said communication of said communication-data between said central means and said data terminal unit in response to predetermined control commands included in a data stream received from said data terminal unit, and said interface means enabling and disabling said communication of said communication-data independently of operations of said exchange means in said central means, wherein said interface means transmits first control data to said exchange control means in response to a first control command from said data terminal unit indicative of a data communication start, transmits second control data to said exchange control means in response to a second control command from said data terminal unit indicative of a data communication end, disables said communication of communication-data between said central means and said data terminal unit in response to a third control command from said data terminal unit indicative of a data communication interrupt, and enables said communication of communication-data between said central means and said data terminal unit in response to a fourth control command from said data terminal unit indicative of a data communication restart; and said exchange control means controlling said exchange means so that communication of communication-data between said data terminal unit and another selected data terminal unit is maintained from a time when said first control data is received from said interface means to a time when said second control data is received from said interface means.
Claim 3
Dependent Claim
78 words
The telephone system of claim 1, wherein: said interface means and said central means are connected to each other via a signal line including a first time-division channel through which said communication-data are transmitted and a second time-division channel through which said control-data are transmitted; and said interface means enables and disables said communication of communication-data between said central means and said data terminal unit by connecting and disconnecting said data terminal unit and said first time-division channel.
Claim 4
Dependent Claim
60 words
The telephone system of claim 2, further comprising: an extension telephone set connected to said central means via said signal line; said signal line further comprising a third time-division channel for said extension telephone set to communicate speech-data with said exchange means; said extension telephone set communicating control-data for call processing with said exchange control means via said second channel.
Claim 5
Dependent Claim
266 words
A telephone system, comprising: a data terminal unit; exchange means, in a central unit, for executing exchange service; exchange control means, in said central unit, for controlling said exchange means; and an interface unit for providing an interface for communication of communication-data between said data terminal unit and said exchange means; said interface unit enabling and disabling said communication of said communication-data between said exchange means and said data terminal unit in response to predetermined control commands included in a data stream received from said data terminal unit, wherein said interface unit transmits first control data to said exchange control means in response to a first control command from said data terminal unit indicative of a data communication start, transmits second control data to said exchange control means in response to a second control command from said data terminal unit indicative of a data communication end, disables said communication of communication-data between said central unit and said data terminal unit in response to a third control command from said data terminal unit indicative of a data communication interrupt, and enables said communication of communication-data between said central unit and said data terminal unit in response to a fourth control command from said data terminal unit indicative of a data communication restart; and said exchange control means controlling said exchange means so that communication of communication-data between said data terminal unit and another selected data terminal unit is maintained from a time when said first control data is received from said interface unit to a time when said second control data is received from said interface unit.
Claim 6
Dependent Claim
266 words
A telephone system, comprising: a data terminal unit; exchange means, in a central unit, for executing exchange service; exchange control means, in said central unit, for controlling said exchange means; and an interface unit for providing an interface for communication of communication-data between said data terminal unit and said exchange means; said interface unit enabling and disabling said communication of said communication-data between said exchange means and said data terminal unit in response to predetermined control commands included in a data stream received from said data terminal unit, wherein said interface unit transmits first control data to said exchange control means in response to a first control command from said data terminal unit indicative of a data communication start, transmits second control data to said exchange control means in response to a second control command from said data terminal unit indicative of a data communication end, disables said communication of communication-data between said central unit and said data terminal unit in response to a third control command from said data terminal unit indicative of a data communication interrupt, and enables said communication of communication-data between said central unit and said data terminal unit in response to a fourth control command from said data terminal unit indicative of a data communication restart; and said exchange control means controlling said exchange means so that communication of communication-data between said data terminal unit and another selected data terminal unit is maintained from a time when said first control data is received from said interface unit to a time when said second control data is received from said interface unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-11 | 1997-10-11 | 1998-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-11 | 2001-10-11 | 2002-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-11 | 2005-10-11 | 2006-04-12 | $7700.00 | Window Closed / Lapsed |