US3864523A
Expired / Lapsed
US
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Method for testing a multiplex transmission system
Assignee: Individual
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Filing: 1974-06-06
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Granted: 1975-02-04
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Expires: 1994-06-06
Abstract
Abstract A method for testing multiplex transmission systems which includes generating a number of different square wave impulse sequences where each of the impulse sequences comprises at least four intervals, the first and third interval defining first and second command intervals, respectively, and the second and fourth intervals defining first and second test intervals. At least one test signal having a first and second signal level is generated. The first signal level is generated during the first command and first test intervals and the second level is generated during the second command and second test interval. Command signals are transmitted through the multiplex system by means of the impulse sequences during the first and second command intervals, each of the impulse sequences being simultaneously transmitted therethrough together with the test signal wherein the first test signal level is transmitted during the first test interval and the second test signal level is transmitted during the second test interval. The transmitted test signals are compared with the generated test signals during their respective test intervals to detect any error in the multiplex transmission system.
Inventors
- 👤 Reiner Kellermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:36
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
250 words
A method for testing short circuits, line breaks, and the like, in a multiplex transmission system including a multiplexer and a demultiplexer used to transmit command signals for control of machine tools and the like, said method comprising: A. generating a number of different square wave impulse sequences, said number of impulse sequences being at least equal to the desired number of multiplex command signals, each of said impulse sequences having at least four intervals, said first and third intervals defining first and second command intervals, respectively, and said second and fourth intervals defining first and second test intervals, respectively, said square wave impulses of each sequence being the same between their respective first and second command intervals and their first and second test intervals; B. simultaneously transmitting each of said impulse sequences through said multiplex system; C. transmitting through said multiplex system command signals by means of said impulse sequences during said first and second command intervals; D. generating at least one test signal having a first and second signal level, said first signal level being generated during said first command and test intervals and said second level being generated during said second command and test intervals; E. transmitting through said multiplex system said first test signal level during said first test interval and said second test signal level during said second test interval; and F. comparing the transmitted test signals with said generated test signals during their respective test intervals to detect any error in the multiplex system.
Claim 2
Independent Claim
250 words
A method for testing short circuits, line breaks, and the like, in a multiplex transmission system including a multiplexer and a demultiplexer used to transmit command signals for control of machine tools and the like, said method comprising: A. generating a number of different square wave impulse sequences, said number of impulse sequences being at least equal to the desired number of multiplex command signals, each of said impulse sequences having at least four intervals, said first and third intervals defining first and second command intervals, respectively, and said second and fourth intervals defining first and second test intervals, respectively, said square wave impulses of each sequence being the same between their respective first and second command intervals and their first and second test intervals; B. simultaneously transmitting each of said impulse sequences through said multiplex system; C. transmitting through said multiplex system command signals by means of said impulse sequences during said first and second command intervals; D. generating at least one test signal having a first and second signal level, said first signal level being generated during said first command and test intervals and said second level being generated during said second command and test intervals; E. transmitting through said multiplex system said first test signal level during said first test interval and said second test signal level during said second test interval; and F. comparing the transmitted test signals with said generated test signals during their respective test intervals to detect any error in the multiplex system.
Claim 3
Dependent Claim
42 words
A method as set forth in claim 1 including generating a second square wave test signal having a sequence frequency equal in duration to the shortest command impulse sequence for controlling command sequence interval time during and first and second testing intervals.
Claim 4
Dependent Claim
42 words
A method as set forth in claim 1 including the step of Generating a third square wave test sequence having a sequence frequency at least as short as the shortest command sequence and transmitting said third test sequence through said multiplex system.
Claim 5
Dependent Claim
39 words
A method as set forth in claim 3 wherein said command and test sequences are transmitted to an analyzer after demultiplexing through a time filter and suppressing all signals having a duration shorter than said third test signal sequence.
References Cited (Backward Citations)
DE1116727B
Cited
DE1271209B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |