US3581075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for disconnecting a defective local concentrator in a data transmission system
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1969-03-25
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Granted: 1971-05-25
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Expires: 1989-03-25
Abstract
Abstract In a data transmission system comprising a number of remote terminals connected in series to a main terminal via a data transferring line inquiries are cyclically sent out from the main terminal to the respective remote terminals. If a fault occurs in a terminal this will affect the whole system. Accordingly each terminal is provided with a shunting arrangement which disconnects a faulty terminal without affecting the rest of the system.
Inventors
- 👤 Orjan Mats Mattsson
- 👤 Walter Herbert Ewin Widl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:33
CPC Classifications
H; H04; H04L; H04L43/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
228 words
In a data transmission system comprising a plurality of remote terminals connected in series to a main terminal via a data transferring line, wherein each of said remote terminals compriseS a modulator and a demodulator connected to said data transferring line, a computer connected to said modulator and said demodulator, a circuit arrangement included in each of said remote terminals for disconnecting a defective remote terminal without disturbing the function of the other remote terminals comprising a first comparator for comparing data information being received by said demodulator from said data transferring line with data information being transferred from said modulator to said data transferring line for generating equality and inequality signals, a second comparator for comparing data information being transferred from said demodulator to said computer with data information being received by said modulator from said computer for generating equality and inequality signals, a third comparator for comparing the signals generated by said first and second comparators and generating a control signal when the signals being compared are unequal, a control signal activatable shunting means interposed between said modulator and demodulator and said data transferring line for disconnecting said modulator and demodulator from said data transferring line and introducing a shunt path for said data transferring line across the terminal, and means for connecting the output of said third comparator to said control signal activatable shunt means.
Claim 2
Dependent Claim
228 words
In a data transmission system comprising a plurality of remote terminals connected in series to a main terminal via a data transferring line, wherein each of said remote terminals compriseS a modulator and a demodulator connected to said data transferring line, a computer connected to said modulator and said demodulator, a circuit arrangement included in each of said remote terminals for disconnecting a defective remote terminal without disturbing the function of the other remote terminals comprising a first comparator for comparing data information being received by said demodulator from said data transferring line with data information being transferred from said modulator to said data transferring line for generating equality and inequality signals, a second comparator for comparing data information being transferred from said demodulator to said computer with data information being received by said modulator from said computer for generating equality and inequality signals, a third comparator for comparing the signals generated by said first and second comparators and generating a control signal when the signals being compared are unequal, a control signal activatable shunting means interposed between said modulator and demodulator and said data transferring line for disconnecting said modulator and demodulator from said data transferring line and introducing a shunt path for said data transferring line across the terminal, and means for connecting the output of said third comparator to said control signal activatable shunt means.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |