US3858010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermediate communication link for use in electronic systems
Assignee: AG Communication Systems Corp
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Filing: 1973-04-06
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Granted: 1974-12-31
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Expires: 1993-04-06
Abstract
Abstract An intermediate communication link which can be used for fast digital communication between electronic frames. The link uses twisted pair cables as a transmission media, and has a cable driven on the input thereof and a receiver on the output which permits the use of cables at least up to 50 feet in length.
Inventors
- 👤 C Higashide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:25
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/39
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
An intermediate communication link for digital communication between electronic frames within a communication system comprising: a transmission cable comprised of a plurality of two wire transmission lines bundled together in a jacket; a line driver and a receiver coupled respectively to the opposite ends of one said wires of each of said transmission lines; each of said line drivers comprising gate means having a parallel diode resistor network in series with the output thereof; each of said receivers comprising gate means having the inputs thereof tied to ground via resistance means; and the opposite ends of the other wire of each of said transmission lines being grounded.
Claim 2
Dependent Claim
107 words
An intermediate communication link for digital communication between electronic frames within a communication system comprising: a transmission cable comprised of a plurality of two wire transmission lines bundled together in a jacket; a line driver and a receiver coupled respectively to the opposite ends of one said wires of each of said transmission lines; each of said line drivers comprising gate means having a parallel diode resistor network in series with the output thereof; each of said receivers comprising gate means having the inputs thereof tied to ground via resistance means; and the opposite ends of the other wire of each of said transmission lines being grounded.
Claim 3
Dependent Claim
52 words
The intermediate communication link of claim 1, wherein said parallel diode resistor network at the output of a line driver matches the output impedance of said line driver in the logic 0 state to the characteristic impedance of said transmission line to prevent cross-talk noise from being reflected back to said receivers.
Claim 4
Dependent Claim
35 words
The intermediate communication link of claim 2, wherein the diode of said parallel diode resistor network is a germanium diode and shunts the resistor thereof to maintain a sufficiently high logic 1 at said receiver.
Claim 5
Dependent Claim
83 words
The intermediate communication link of claim 1, wherein each of said line drivers comprises a NAND gate having a parallel diode resistor network at the output thereof for matching the output impedance of said line drivers in the logic 0 state to the characteristic impedance of said transmission lines and for preventing cross-talk noise from being reflected back to said receivers, the diode thereof being a germanium diode and shunting said resistor to maintain a sufficiently high logic 1 level at said receiver.
Claim 6
Dependent Claim
38 words
The intermediate communication link of claim 4, wherein each of said receivers comprises an AND gate having the inputs thereof tied to ground via resistance means, said resistance means being of a resistance value to eliminate most reflections.
Claim 7
Dependent Claim
23 words
The intermediate communication link of claim 1 wherein said two wires of each of said transmission lines comprises a twisted pair of wires.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |