Patent US4064459A successfully refreshed from Google Patents.
US4064459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of automatically testing the serviceability of a data transmission system
Assignee: Siemens AG
•
Filing: 1976-07-09
•
Granted: 1977-12-20
•
Expires: 1996-07-09
Abstract
Abstract A method is described for testing the transmission quality of a data transmission system in its operational state. During a test key actuation data bits having a specific marking polarity and at least one additional bit having a polarity corresponding to the spacing condition are transmitted. At a receiving station the latter transmitted bit group is analyzed for disturbances. In the event of multiple undisturbed reception of the aforementioned bit pattern a visual indication is produced. At the same time, in the receiving station, the data output of the receiver is connected to the transmitter, and the aforementioned bit pattern is transmitted back to the testing station. With multiple undisturbed reception of the bit pattern a visual indication is produced in the testing station. During the test procedure the data input and output units are blocked.
Inventors
- 👤 Wernhard Markwitz
- 👤 Volker Dumichen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:31
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
A method of automatically testing the transmission quality of a data transmission system, comprising the steps of: transmitting from a testing station during actuation of a first key a bit group containing data bits having a given marking polarity and at least one additional bit corresponding to a spacing condition, receiving said bit group in a receiving station, analyzing said received bit group for transmission disturbances, producing a visual indication is said receiving station in the event of mulitple undisturbed reception of said bit group, connecting, in the event of multiple undisturbed reception of said bit group, a receiver in said receiving station to a transmitter therein and retransmitting said bit group to said testing station, analyzing said retransmitted bit group for transmission disturbances, producing a visual indication in said testing station in the event of multiple undisturbed reception of said retransmitted bit group and blocking data input and output circuits in said testing and receiving stations during performance of the foregoing testing method.
Claim 2
Independent Claim
164 words
A method of automatically testing the transmission quality of a data transmission system, comprising the steps of: transmitting from a testing station during actuation of a first key a bit group containing data bits having a given marking polarity and at least one additional bit corresponding to a spacing condition, receiving said bit group in a receiving station, analyzing said received bit group for transmission disturbances, producing a visual indication is said receiving station in the event of mulitple undisturbed reception of said bit group, connecting, in the event of multiple undisturbed reception of said bit group, a receiver in said receiving station to a transmitter therein and retransmitting said bit group to said testing station, analyzing said retransmitted bit group for transmission disturbances, producing a visual indication in said testing station in the event of multiple undisturbed reception of said retransmitted bit group and blocking data input and output circuits in said testing and receiving stations during performance of the foregoing testing method.
Claim 3
Dependent Claim
23 words
The method defined in claim 1 wherein said bit group comprises a block of data bits, a synchronizing bit and a status bit.
Claim 4
Dependent Claim
30 words
The method defined in claim 2 wherein said synchronizing bit is transmitted with a predeterined polarity and said status bit is transmitted with a polarity corresponding to said spacing condition.
Claim 5
Dependent Claim
33 words
The method defined in claim 1 wherein said analyzing steps include counting with a marking counter the repetitions of said bit group and, upon reaching a predetermined maximum count, triggering said visual indications.
Claim 6
Dependent Claim
28 words
The method defined in claim 4 comprising the additional step of: rendering the marking counter inoperative upon appearance of a status bit indicating the system to be operative.
Claim 7
Dependent Claim
30 words
The method defined in claim 4 comprising the additional step of: returning said marking counter to its inoperative state when said analyzing steps indicate the status bits to be faulty.
Claim 8
Dependent Claim
29 words
The method defined in claim 4 comprising the additional step of: resetting said marking counter upon reception of a plurality of said bit groups not having said marking polarity.
Claim 9
Dependent Claim
44 words
The method defined in claim 1 comprising the additional steps of: transmitting a status bit indicating the operative state of the system when said first key is released and extinguishing said visual indications upon reception of a plurality of said operative state status bits.
References Cited (Backward Citations)
US3430144A
Cited
US3622877A
Cited
US3655915A
Cited
US3743938A
Cited
US3819878A
Cited
US3956601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |