US4685113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driver isolating circuit for common bus-type transmission of local area network
Assignee: Mitsubishi Cable Industries Ltd
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Filing: 1985-10-08
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Granted: 1987-08-04
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Expires: 2005-10-08
Abstract
Abstract A driver in a transceiver for a common bus-type transmission system of a local area network includes a switching transistor for receiving a transmission data signal from a station and outputting a forward data signal to a bus, a diode for stopping data entry from a bus to the switching transistor, a first data detection circuit for detecting the presence of the transmission data signal, a second data detection circuit for detecting the presence of the forward data signal, a determination circuit for detecting the occurrence of the short circuit of either one of the switching transistor and the diode, and a controller for controlling the conduction between the switching transistor and the bus.
Inventors
- 👤 Susumu Hono
- 👤 Ichiro Okuda
- 👤 Hiroshi Ishihara
- 👤 Masahiko Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40006; H04L12/40013
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
A driver transceiver for a common bus-type transmission system of a local area network comprising: switching means for receiving a transmission data signal from a station and outputting a forward data signal to a bus; diode means connected to an output terminal of said switching means for stopping data entry from the bus to said switching means; first data detection means connected to an input side of said switching means for detecting the presence of the transmission data signal; second data detection means connected to said output terminal of said switching means and said diode means for detecting the presence of the forward data signal; determination means responsive to said first and said second data detection means for determining whether either one of said switching means and said diode means short-circuits and control means, responsive to said determination means, for controlling the conduction between said switching means and the bus such that said switching means has no conduction path to said bus if either said switching means or diode means short-circuits.
Claim 2
Dependent Claim
171 words
A driver transceiver for a common bus-type transmission system of a local area network comprising: switching means for receiving a transmission data signal from a station and outputting a forward data signal to a bus; diode means connected to an output terminal of said switching means for stopping data entry from the bus to said switching means; first data detection means connected to an input side of said switching means for detecting the presence of the transmission data signal; second data detection means connected to said output terminal of said switching means and said diode means for detecting the presence of the forward data signal; determination means responsive to said first and said second data detection means for determining whether either one of said switching means and said diode means short-circuits and control means, responsive to said determination means, for controlling the conduction between said switching means and the bus such that said switching means has no conduction path to said bus if either said switching means or diode means short-circuits.
Claim 3
Dependent Claim
52 words
The driver according to claim 1, wherein said determination means determines the occurrence of the short circuit of either one of said switching means and said diode means based on a condition that the detection signal of said first data detection means is different from that of said second data detection means.
Claim 4
Dependent Claim
13 words
The driver according to claim 1, wherein said switching means comprises a transistor.
Claim 5
Dependent Claim
23 words
The driver according to claim 1, wherein at least one of said first and said second data detection means comprises a mono-stable multivibrator.
Claim 6
Dependent Claim
18 words
The driver according to claim 1, wherein said control means comprises a mechanical switch or an electronic switch.
Claim 7
Dependent Claim
23 words
The driver according to claim 1 wherein at least one of said first and second data detection means comprise a low pass filter.
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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |