Patent US3748411A successfully refreshed from Google Patents.
US3748411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier supervisory arrangements
Assignee: STC PLC
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Filing: 1971-08-23
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Granted: 1973-07-24
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Expires: 1991-08-23
Abstract
Abstract A pilot-controlled transmission system is disclosed for use on communication cables. The pilot-signal is detected at a master repeater station and control pulses indicative of its level are transmitted along the cable in the opposite direction to the signals. The control pulses control slave repeaters, each of which except the last, repeats the control pulses in the opposite direction to the signals. A power pick-off filter at the output of a repeater is arranged to pick off the control pulses and a power pick up filter at the input of a repeater is arranged to apply the control pulses to the cable.
Inventors
- 👤 R Heyes
- 👤 M Betts
- 👤 H Cranswick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A transmission system comprising a plurality of repeaters spaced along a transmission path and arranged to transmit both intelligence signals and power, the repeaters being controllable by a signal produced in response to a pilot signal transmitted from a control station via the transmission path and the repeaters, the repeater which is furthest from the control station including means to produce control signals in response to the pilot signals, said control signals being selected to be transmitted in the frequency band below that allotted for intelligence transmission, each repeater including means to transmit said control signals over the transmission path to the preceding repeater in the group, a power pick-off filter at the output of a repeater is arranged to pick off the control signal and a power pick-off filter at the input of a repeater is arranged to apply the control signal to the transmission path.
Claim 2
Dependent Claim
147 words
A transmission system comprising a plurality of repeaters spaced along a transmission path and arranged to transmit both intelligence signals and power, the repeaters being controllable by a signal produced in response to a pilot signal transmitted from a control station via the transmission path and the repeaters, the repeater which is furthest from the control station including means to produce control signals in response to the pilot signals, said control signals being selected to be transmitted in the frequency band below that allotted for intelligence transmission, each repeater including means to transmit said control signals over the transmission path to the preceding repeater in the group, a power pick-off filter at the output of a repeater is arranged to pick off the control signal and a power pick-off filter at the input of a repeater is arranged to apply the control signal to the transmission path.
Claim 3
Dependent Claim
156 words
A transmission system comprising a plurality of repeaters spaced along a transmission path and arranged to transmit both intelligence signals and power, the repeaters being controllable by a signal produced in response to a pilot signal transmitted from a control station via the transmission path and the repeaters, the repeater which is furthest from the control station including means to produce control signals in response to the pilot signal, said control signals being selected to be transmitted in the frequency band below that allotted for intelligence transmission, and each repeater including means to transmit said control signals over the transmission path to the preceding repeater in the group, said control signals being control pulses having a duration which is short compared with the time lapse between successive pulses and in which each repeater except the last is arranged to lengthen the received pulses and apply them to a thermistor in the control circuits of the repeater.
Claim 4
Dependent Claim
156 words
A transmission system comprising a plurality of repeaters spaced along a transmission path and arranged to transmit both intelligence signals and power, the repeaters being controllable by a signal produced in response to a pilot signal transmitted from a control station via the transmission path and the repeaters, the repeater which is furthest from the control station including means to produce control signals in response to the pilot signal, said control signals being selected to be transmitted in the frequency band below that allotted for intelligence transmission, and each repeater including means to transmit said control signals over the transmission path to the preceding repeater in the group, said control signals being control pulses having a duration which is short compared with the time lapse between successive pulses and in which each repeater except the last is arranged to lengthen the received pulses and apply them to a thermistor in the control circuits of the repeater.
Claim 5
Dependent Claim
136 words
A transmission system comprising a plurality of repeaters spaced along a transmission path and arranged to transmit both intelligence signals and power, the repeaters being controllable by a signal produced in response to a pilot signal transmitted from a control station via the transmission path and the repeaters, the repeater which is furthest from the control station including means to produce control signals in response to the pilot signal, said control signals being selected to be transmitted in the frequency band below that allotted for intelligence transmission, and each repeater including means to transmit said control signals over the transmission path to the preceding repeater in the group, each repeater being arranged to produce pulses of a chosen duration and recurrence frequency in response to the absence of either a pilot signal or a control signal.
Claim 6
Dependent Claim
136 words
A transmission system comprising a plurality of repeaters spaced along a transmission path and arranged to transmit both intelligence signals and power, the repeaters being controllable by a signal produced in response to a pilot signal transmitted from a control station via the transmission path and the repeaters, the repeater which is furthest from the control station including means to produce control signals in response to the pilot signal, said control signals being selected to be transmitted in the frequency band below that allotted for intelligence transmission, and each repeater including means to transmit said control signals over the transmission path to the preceding repeater in the group, each repeater being arranged to produce pulses of a chosen duration and recurrence frequency in response to the absence of either a pilot signal or a control signal.
Claim 7
Dependent Claim
30 words
A transmission system according to claim 1, wherein said control signals are pulse signals having a duration and repetition frequency for transmission within the frequency band allocated for power transmission.
Claim 8
Dependent Claim
21 words
A transmission system according to claim 2, wherein said control pulses are transmitted within the frequency band allocated for power transmission.
Claim 9
Dependent Claim
21 words
A transmission system according to claim 3, wherein said control signals are transmitted within the frequency band allocated for power transmission.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |