Telephone system
First Claim
1. A telephone system, comprising:
- central means havingexchange means for executing exchange service, andexchange control means for controlling said exchange means; and
interface meansconnected to said exchange means for communication of communication-data therewith,connected to said exchange control means for communication of control-data therewith, andconnected 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, andsaid 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 meanstransmits 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, andenables 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.
1 Assignment
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Accused Products
Abstract
The telephone system comprises a central or key service unit 1, data terminal units 51 to 5n, and data set circuits of data terminal interface units 271 to 27n for communications between the central unit 1 and the data terminal units 51 to 5n, 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 271 to 27n 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 271 to 27n enables and disables communication of communication-data between each data terminal 51 to 5n and the time switch 17 in response to predetermined control commands received from each data terminal unit 51 to 5n.
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Citations
4 Claims
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1. A telephone system, comprising:
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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. - View Dependent Claims (2, 3)
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4. A telephone system, comprising:
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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.
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Specification