US3790769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for fault detection and location on data lines
Assignee: International Standard Electric Corp
•
Filing: 1972-11-21
•
Granted: 1974-02-05
•
Expires: 1992-11-21
Abstract
Abstract Whenever faults or errors are detected in the receive data signal at one station of a data link, a predetermined signal requesting transmission of a special signal is transmitted to the other station of the data link. If the special signal is not correctly received at the one station, a changeover occurs and the transmitter and receiver within each station are interconnected. Check signals are transmitted and from the results it can be determined whether the fault is due to bit errors, a faulty transmitter and/or a faulty receiver of either or both of the stations or a faulty line interconnecting the stations.
Inventors
- 👤 R Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:49
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18; H04L1/1867; H04L1/188; H04L1/22; H04L2001/125
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
526 words
A system for determining the type and location of trouble during the transmission of data signals comprising: a first station including a first transmitter, a first receiver, and a first data signal checking circuit coupled to said first receiver to determine the condition of data signals received at said first receiver; a second station including a second transmitter coupled to said first receiver to transmit data signals thereto, a second receiver coupled to said first transmitter to receive data signals transmitTed therefrom, and a second data signal checking circuit coupled to said second receiver to determine the condition of data signals received at said second receiver; first means disposed in both of said first and second stations, said first means being coupled to the associated one of said first and second checking circuit in one of said first and second stations to detect errors in said data signals received by the associated one of said first and second receivers and to produce a first signal requesting the transmission of a first special signal from the other of said first and second stations when an error is detected in said data signals received by said associated one of said first and second receivers, said first signal being transmitted from the associated one of said first and second transmitters of said one of said first and second stations to the associated one of said first and second receiver of said other of said first and second stations; second means disposed in both of said first and second stations, said second means of said other of said first and second stations being responsive to said first signal to generate siad first special signal for transmission to said one of said first and second stations, said first special signal being transmitted from the associated one of said first and second transmitters of said other of said first and second stations to the associated one of said first and second receivers of said one of said first and second stations; third means disposed in both of said first and second stations, said third means being coupled to the associated one of said first and second receivers of said one of said first and second stations to detect errors in said first special signal and to produce a second signal when said first special signal is in error; and fourth means disposed in both of said first and second stations, said fourth means of said one of said first and second stations being coupled to said third means of said one of said first and second stations, said fourth means being responsive to said second signal to interconnect the associated one of said first and second transmitters of said one of said first and second stations to the associated one of said first and second receivers of said one of said first and second stations; said third means of said one of said first and second stations reacting to this latter interconnection to indicate whether said detected errors are due to faulty operation of the associated one of said first and second receivers of said one of said first and second stations.
Claim 2
Independent Claim
526 words
A system for determining the type and location of trouble during the transmission of data signals comprising: a first station including a first transmitter, a first receiver, and a first data signal checking circuit coupled to said first receiver to determine the condition of data signals received at said first receiver; a second station including a second transmitter coupled to said first receiver to transmit data signals thereto, a second receiver coupled to said first transmitter to receive data signals transmitTed therefrom, and a second data signal checking circuit coupled to said second receiver to determine the condition of data signals received at said second receiver; first means disposed in both of said first and second stations, said first means being coupled to the associated one of said first and second checking circuit in one of said first and second stations to detect errors in said data signals received by the associated one of said first and second receivers and to produce a first signal requesting the transmission of a first special signal from the other of said first and second stations when an error is detected in said data signals received by said associated one of said first and second receivers, said first signal being transmitted from the associated one of said first and second transmitters of said one of said first and second stations to the associated one of said first and second receiver of said other of said first and second stations; second means disposed in both of said first and second stations, said second means of said other of said first and second stations being responsive to said first signal to generate siad first special signal for transmission to said one of said first and second stations, said first special signal being transmitted from the associated one of said first and second transmitters of said other of said first and second stations to the associated one of said first and second receivers of said one of said first and second stations; third means disposed in both of said first and second stations, said third means being coupled to the associated one of said first and second receivers of said one of said first and second stations to detect errors in said first special signal and to produce a second signal when said first special signal is in error; and fourth means disposed in both of said first and second stations, said fourth means of said one of said first and second stations being coupled to said third means of said one of said first and second stations, said fourth means being responsive to said second signal to interconnect the associated one of said first and second transmitters of said one of said first and second stations to the associated one of said first and second receivers of said one of said first and second stations; said third means of said one of said first and second stations reacting to this latter interconnection to indicate whether said detected errors are due to faulty operation of the associated one of said first and second receivers of said one of said first and second stations.
Claim 3
Dependent Claim
383 words
A system according to claim 1, further including said first means coupled to the associated one of said first and second checking circuit in said other of said first and second stations to detect errors in said data signals received by the associated one of said first and second receivers and to produce a third signal requesting the transmission of a second special signal from said one of said first and second stations when an error is detected in said data signals received by said associated one of said first and second receivers, said third signal being transmitted from the associated one of said first and second transmitters of said other of said first and second stations to the associated one of said first and second receiver of said one of said first and second stations; said second means of said one of said first and second stations being responsive to said third signal to generate said second special signal for transmission to said other of said first and second stations, said second special signal being transmitted from the associated one of said first and second transmitters of said one of said first and second stations to the associated one of said first and second receivers of said other of said first and second stations; said third means being coupled to the associated one of said first and second receivers of said other of said first and second stations to detect errors in said second special signal and to produce a fourth signal when said second special signal is in error; and fifth means disposed in both of said first and second stations, said fifth means being coupled to said third means of said other of said first and second stations responsive to said fourth signal to substantially simultaneously with said fourth means of said one of said first and second stations interconnect the associated one of said first and second transmitters of said other of said first and second stations with the associated one of said first and second receivers of said other of said first and second stations to provide an indication of whether said detected errors are due to faulty operation of the associated one of said first and second transmitters of said other of said first and second stations.
Claim 4
Dependent Claim
46 words
A system according to claim 2, wherein said data signal received by said first and second receivers each include a parity code, and said first and second checking circuits check said parity code to determine if the associated one of said data signals contains an error.
Claim 5
Dependent Claim
31 words
A system according to claim 3, wherein said parity code is different for said data signal received by said second receiver and for said data signal received by said first receiver.
Claim 6
Dependent Claim
33 words
A system according to claim 4, wherein when said fourth means and said fifth means interconnect their associated transmitters and receivers said first and second checking circuits appropriately change their parity code check.
Claim 7
Dependent Claim
46 words
A system according to claim 1, wherein said data signal received by said first and second receivers each include a parity code, and said first and second checking circuits check said parity code to determine if the associated one of said data signals contains an error.
Claim 8
Dependent Claim
31 words
A system according to claim 6, wherein said parity code is different for said data signal received by said second receiver and for said data signal received by said first receiver.
Claim 9
Dependent Claim
71 words
A system according to claim 7, wherein when said fourth means interconnects the associated one of said first and second transmitters of said one of said first and second stations and the associated one of said first and second receivers of said one of said first and second stations the associated one of said first and second checking circuit of said first and second station appropriately changes its parity code check.
Claim 10
Dependent Claim
62 words
A system according to claim 1, further including a timing circuit disposed in both of said first and second stations, said timing circuit being coupled to the ssociated one of said third means which is reset whenever data signals are correctly received and which is not reset whenever data signals are incorrectly received to control the time sequence of error locating steps.
Claim 11
Dependent Claim
21 words
A system according to claim 1, wherein said first signal and said special signal are transmitted in intervals between data signals.
Claim 12
Dependent Claim
190 words
A system according to claim 2, wherein said fourth means of said other of said first and second stations is coupled to said third means of said other of said first and second stations, said fourth means being responsive to said fourth signal to interconnect the associated one of said first and second transmitters of said other of said first and second stations to the associated one of said first and second receivers of said other of said first and second stations and said fifth means is coupled to said third means of said first and second stations responsive to said second signal to substantially simultaneously with said fourth means of said other of said first and second stations interconnect the associated one of said first and second transmitters of said one of said first and second stations with the associated one of said first and second receivers of said one of said first and second stations to provide an indication of whether said detected errors are due to faulty operation of the associated one of said first and second transmitters of said one of said first and second stations.
Claim 13
Dependent Claim
46 words
A system according to claim 11, wherein said data signal received by said first and second receivers each include a parity code, and said first and second checking circuits check said parity code to determine if the associated one of said data signals contains an error.
Claim 14
Dependent Claim
31 words
A system according to claim 12, wherein said parity code is different for said data signal received by said second receiver and for said data signal received by said first receiver.
Claim 15
Dependent Claim
33 words
A system according to claim 13, wherein when said fourth means and said fifth means interconnect their associated transmitters and receivers said first and second checking circuits appropriately change their parity code check.
Claim 16
Dependent Claim
62 words
A system according to claim 11, further including a timing circuit disposed in both of said first and second stations, said timing circuit being coupled to the associated one of said third means which is reset whenever data signals are correctly received and which is not reset whenever data signals are incorrectly received to control the time sequence of error locating steps.
Claim 17
Dependent Claim
21 words
A system according to claim 11, wherein said first signal and said special signal are transmitted in intervals between data signals.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |