US5117425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication interface
Assignee: Canon Inc
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Filing: 1991-03-04
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Granted: 1992-05-26
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Expires: 2011-03-04
Abstract
Abstract A communication interface for the protocol of a layer 1 using an ISDN digital communication network, includes: a first communication controller to execute the communication control for a standard terminal; a second communication controller to execute the communications control for a network terminal device; and a switch between to switch the first and second communication controllers. The first communication controller executes the control as a layer 1 of the ISDN standard terminal. The second communication controller executed the control as a layer 1 of the network terminal device which is connected to the ISDN. The communication interface can execute the two-way connection test separately from the ISDN network and can be used in three modes of the ISDN layer 1 interface, TE layer 1 interface, and NT layer 1 interface.
Inventors
- 👤 Yukihiko Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:11
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0435; H04Q11/0471; H04Q2213/00; H04Q2213/214; H04Q2213/216
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
207 words
A communication interface for a network terminal device and a standard terminal connected to the network terminal device, used in a communication network comprising an Integrated Services Digital Network, the network terminal device and the standard terminal, said interface comprising: communication control means for controlling data transmission/reception, executing a first communication control operation for controlling the data transmission/reception to/from the network terminal device by using said communication interface as an interface for the standard terminal, and executing a second communication control operation for controlling data transmission/reception to/from the Integrated Services Digital Network to/from the standard terminal by using said communication interface as an interface for the network terminal device; first switching means for switching between said first and second communication control operations by said communication control means such that said first communication control operation is executed by said communication control means when said communication interface is used as the interface for the standard terminal and said second communication control operation is executed by said communication control means when said communication interface is used as the interface from the network terminal device; and second switching means for switching a clock source used by said communication control means, in accordance with said switching operation of said first switching means.
Claim 2
Dependent Claim
207 words
A communication interface for a network terminal device and a standard terminal connected to the network terminal device, used in a communication network comprising an Integrated Services Digital Network, the network terminal device and the standard terminal, said interface comprising: communication control means for controlling data transmission/reception, executing a first communication control operation for controlling the data transmission/reception to/from the network terminal device by using said communication interface as an interface for the standard terminal, and executing a second communication control operation for controlling data transmission/reception to/from the Integrated Services Digital Network to/from the standard terminal by using said communication interface as an interface for the network terminal device; first switching means for switching between said first and second communication control operations by said communication control means such that said first communication control operation is executed by said communication control means when said communication interface is used as the interface for the standard terminal and said second communication control operation is executed by said communication control means when said communication interface is used as the interface from the network terminal device; and second switching means for switching a clock source used by said communication control means, in accordance with said switching operation of said first switching means.
Claim 3
Dependent Claim
40 words
A communication interface according to claim 1, wherein said first communication control operation controls the data transmission/reception to/from the network terminal device by using said communication interface as a layer 1 interface for the Integrated Services Digital Network standard terminal.
Claim 4
Dependent Claim
50 words
A communication interface according to claim 1, wherein said second communication control operation controls the data transmission/reception to/from the Integrated Services Digital Network and to/from the standard terminal by using said communication interface as a layer 1 interface for the network terminal device connected to the Integrated Services Digital Network.
Claim 5
Dependent Claim
55 words
A communication interface according to claim 1, wherein said communication control means has: extracting means for extracting a clock signal from data which is sent from the network terminal device; and first control means for controlling transmission and reception of the data to/from the network terminal device on the basis of said extracted clock signal.
Claim 6
Dependent Claim
54 words
A communication interface according to claim 4, wherein when said first switching means switches to the first communication control operation said first control means executes the transmission of the data to the network terminal device and the reception of the data from the network terminal device on the basis of said extracted clock signal.
Claim 7
Dependent Claim
90 words
A communication interface according to claim 1, wherein said communication control means has: extracting means for extracting a clock signal from the data which is sent from the standard terminal; receiving means for receiving a clock signal from the outside of said communication interface, and the communication network; and second control means for controlling the transmission and reception of the data to/from the Integrated Services Digital Network on the basis of said extracted clock signal and said clock signal from the outside of said communication interface and the communication network.
Claim 8
Dependent Claim
60 words
A communication interface according to claim 6, wherein when said first switching means switches to the second communication control operation said second control means executes the reception of the data from the standard terminal on the basis of said extracted clock signal and the transmission of the data to the standard terminal on the basis of said clock signal received.
Claim 9
Dependent Claim
29 words
A communication interface according to claim 1, further having means for receiving a clock signal sent from the network and supplying said clock signal to the communication control means.
Claim 10
Dependent Claim
186 words
A communication interface comprising: extracting means for extracting a clock signal from data received from a network terminal device and from a standard terminal; input means for inputting a clock signal from an internal oscillator the period of which is different from the period of the extracted clock signal; and communication control means for controlling data transmission/reception on the basis of the clock signal extracted by said extracting means and the clock signal input by said input means, wherein said communication control means executes a first communication control operation for controlling the data transmission/reception to/from the network terminal device on the basis of the clock signal extracted from the data received from the network terminal device, by using said communication interface as an interface for the standard terminal, and said communication control means executes a second communication control operation for controlling data reception from the standard terminal based on the clock signal extracted from the received data from the standard terminal, and data transmission to the standard terminal using the input clock signal, by using said communication interface as an interface for the network terminal device.
Claim 11
Dependent Claim
186 words
A communication interface comprising: extracting means for extracting a clock signal from data received from a network terminal device and from a standard terminal; input means for inputting a clock signal from an internal oscillator the period of which is different from the period of the extracted clock signal; and communication control means for controlling data transmission/reception on the basis of the clock signal extracted by said extracting means and the clock signal input by said input means, wherein said communication control means executes a first communication control operation for controlling the data transmission/reception to/from the network terminal device on the basis of the clock signal extracted from the data received from the network terminal device, by using said communication interface as an interface for the standard terminal, and said communication control means executes a second communication control operation for controlling data reception from the standard terminal based on the clock signal extracted from the received data from the standard terminal, and data transmission to the standard terminal using the input clock signal, by using said communication interface as an interface for the network terminal device.
Claim 12
Dependent Claim
24 words
A communication interface according to claim 9, further having selecting means for selecting the first communication control operation or the second communication control operation.
Claim 13
Dependent Claim
56 words
A communication interface according to claim 10, wherein when said selecting means selects said first communication control operation, said communication interface operates as an interface for the Integrated Services Digital Network standard terminal, and when said selecting means selects said second communication control operation, said communication interface operates as an interface for the network terminal device.
Claim 14
Dependent Claim
151 words
A communication interface for a communication system comprising an Integrated Services Digital Network, a network terminal device and a standard terminal connected to the network terminal device, said communication interface comprising: extracting means for extracting a first clock from data transmitted from the network terminal device; generating means for generating a second clock from a clock of an internal oscillator; inputting means for inputting a third clock transmitted from said Integrated Services Digital Network; and communication control means for controlling data transmission/reception on the basis of said first, second and third clocks, wherein said communication control means executes control for data transmission to said network terminal device on the basis of said first clock, control for data transmission to said standard terminal on the basis of said second clock, and control for data transmission to said standard terminal or said Integrated Services Digital Network on the basis of said third clock.
Claim 15
Dependent Claim
151 words
A communication interface for a communication system comprising an Integrated Services Digital Network, a network terminal device and a standard terminal connected to the network terminal device, said communication interface comprising: extracting means for extracting a first clock from data transmitted from the network terminal device; generating means for generating a second clock from a clock of an internal oscillator; inputting means for inputting a third clock transmitted from said Integrated Services Digital Network; and communication control means for controlling data transmission/reception on the basis of said first, second and third clocks, wherein said communication control means executes control for data transmission to said network terminal device on the basis of said first clock, control for data transmission to said standard terminal on the basis of said second clock, and control for data transmission to said standard terminal or said Integrated Services Digital Network on the basis of said third clock.
Claim 16
Dependent Claim
21 words
A communication interface according to claim 12, further having selecting means for selecting one of said first, second, and third clocks.
Claim 17
Dependent Claim
33 words
A communication interface according to claim 13, wherein when said first clock is selected by said selecting means, said communication interface operates as an interface for the Integrated Services Digital Network standard terminal.
Claim 18
Dependent Claim
51 words
A communication interface according to claim 13, wherein when said second clock is selected by said selecting means, said communication interface operates as a pseudo interface for the network terminal device of the Integrated Services Digital Network even if said communication interface is not connected to the Integrated Services Digital Network.
Claim 19
Dependent Claim
33 words
A communication interface according to claim 13, wherein when said third clock is selected by said selecting means, said communication interface operates as an interface for the Integrated Services Digital Network terminal device.
Claim 20
Dependent Claim
17 words
A communication interface according to claim 12, wherein said communication interface is constructed as a one-chip LSI.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |