US3629523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repeater for a transmission line and a method of monitoring the repeater in the line
Assignee: Alcatel CIT SA
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Filing: 1969-09-24
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Granted: 1971-12-21
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Expires: 1989-09-24
Abstract
Abstract Each repeater is fitted with a transmitter of a characteristic frequency located in the interband range of a n + n high-band and low-band link. By combining with a measuring frequency in the low band transmitted from the terminal station A, the nonlinearity of the repeater gives rise to a frequency in the high band which is received and measured in this same terminal station A.
Inventors
- 👤 Christian Chalhoub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:53
CPC Classifications
H; H04; H04B; H04B17/00; H04B17/40; H04B17/401; H04B17/402; H04B17/403
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
A repeater for use in a transmission line having an amplifier and filter means to transmit a high-frequency band in one direction and a low-frequency band in the opposite direction, the high-and-low frequency bands being separated by an untransmitted intermediate band of frequencies, the repeater having a remote monitoring facility and including first circuit means for supplying a characteristic frequency fc in the intermediate band, second circuit means for supplying an identification frequency fi in the high-frequency band, an element connected to said first and second circuit means for applying the characteristic and identification frequencies to the input of said amplifier of the repeater, and filter element for separating from the amplifier output a constant frequency fd, where fd is equal to (fc+ fm) or (fc- fm), fm being a monitoring frequency transmitted in one of the transmitted frequency bands by a terminal station of the transmission line, and fd being in the other transmitted frequency band.
Claim 2
Dependent Claim
157 words
A repeater for use in a transmission line having an amplifier and filter means to transmit a high-frequency band in one direction and a low-frequency band in the opposite direction, the high-and-low frequency bands being separated by an untransmitted intermediate band of frequencies, the repeater having a remote monitoring facility and including first circuit means for supplying a characteristic frequency fc in the intermediate band, second circuit means for supplying an identification frequency fi in the high-frequency band, an element connected to said first and second circuit means for applying the characteristic and identification frequencies to the input of said amplifier of the repeater, and filter element for separating from the amplifier output a constant frequency fd, where fd is equal to (fc+ fm) or (fc- fm), fm being a monitoring frequency transmitted in one of the transmitted frequency bands by a terminal station of the transmission line, and fd being in the other transmitted frequency band.
Claim 3
Dependent Claim
41 words
A repeater as claimed in claim 1, in which said first circuit means comprises an oscillator for providing the frequency fc and said second circuit means comprises a frequency multiplier for providing the frequency fi by multiplication of the frequency fc.
Claim 4
Dependent Claim
41 words
A repeater as claimed in claim 1, in which said second circuit means comprises an oscillator for providing the frequency fi and said first circuit means comprises a frequency divider for providing the frequency fc by division of the frequency fi.
Claim 5
Dependent Claim
23 words
A repeater as claimed in claim 2, in which the frequency multiplier is adapted to multiply by two, whereby fi 2 X fc.
Claim 6
Dependent Claim
23 words
A repeater as claimed in claim 3, in which the frequency divider is adapted to divide by two, whereby fi 2 X fc.
Claim 7
Dependent Claim
25 words
A repeater as claimed in claim 1, in which fd fm+ fc, fm is in the low-frequency band and fd is in the high-frequency band.
Claim 8
Dependent Claim
187 words
In combination with a transmission cable having at least one terminal station and a plurality of repeaters each comprising an amplifier and filter means for passing a high-frequency band in one direction through the repeater and a low-frequency band in the opposite direction through the repeater, the high and low-frequency bands being separated by an untransmitted intermediate band of frequencies, and a monitoring facility connected to each repeater including first circuit means for supplying a characteristic frequency fc in the intermediate band, second circuit means for supplying an identification frequency fi in the high-frequency band, an element connected to said first and second circuit means for applying said characteristic and identification frequencies to the input of said amplifier of the associated repeater, each repeater including a filter element connected to the output of said amplifier for separating from the amplifier output a constant frequency fd, where fd is equal to (fc+ fm) or (fc- fm), fm being a monitoring frequency transmitted in one of said high or said low-frequency band by said terminal station and fd being in the other of said high or said low-frequency band.
Claim 9
Dependent Claim
187 words
In combination with a transmission cable having at least one terminal station and a plurality of repeaters each comprising an amplifier and filter means for passing a high-frequency band in one direction through the repeater and a low-frequency band in the opposite direction through the repeater, the high and low-frequency bands being separated by an untransmitted intermediate band of frequencies, and a monitoring facility connected to each repeater including first circuit means for supplying a characteristic frequency fc in the intermediate band, second circuit means for supplying an identification frequency fi in the high-frequency band, an element connected to said first and second circuit means for applying said characteristic and identification frequencies to the input of said amplifier of the associated repeater, each repeater including a filter element connected to the output of said amplifier for separating from the amplifier output a constant frequency fd, where fd is equal to (fc+ fm) or (fc- fm), fm being a monitoring frequency transmitted in one of said high or said low-frequency band by said terminal station and fd being in the other of said high or said low-frequency band.
Claim 10
Dependent Claim
25 words
The combination defined in claim 7, Wherein said termInal station includes testing means for testing the gain of said repeater at said constant frequency fd.
Claim 11
Dependent Claim
62 words
The combination defined in claim 8, wherein said monitoring facility further includes amplitude-selecting means, connected between said second circuit means and said element for applying said characteristic and identification frequencies to the input of said amplifier and responsive to the output signal level of said amplifier, for blocking said identification signal when the output level of said amplifier reaches a prescribed value.
Claim 12
Dependent Claim
41 words
A repeater as claimed in claim 7, in which said first circuit means comprises an oscillator for providing the frequency fc and said second circuit means comprises a frequency multiplier for providing the frequency fi by multiplication of the frequency fc.
Claim 13
Dependent Claim
41 words
A repeater as claimed in claim 7, in which said second circuit means comprises an oscillator for providing the frequency fi and said first circuit means comprises a frequency divider for providing the frequency fc by division of the frequency fi.
Claim 14
Dependent Claim
25 words
A repeater as claimed in claim 7, in which fd fm+ fc, fm is in the low-frequency band and fd is in the high-frequency band.
Claim 15
Independent Claim
217 words
A method of monitoring the nonlinearity of a repeater in a transmission line having an amplifier and filter means for transmitting a high-frequency band in one direction and a low-frequency band in the opposite direction, the high and low-frequency bands being separated by an untransmitted intermediate band of frequencies, comprising the steps of applying to the input of said amplifier a characteristic frequency fc in the intermediate band and an identification frequency fi in the high-frequency band, applying to one end of said repeater a constant frequency fd, cutting-off the identification frequency fi when the level of the signal at the output of said amplifier has a predetermined value, measuring the gain of the line at the other end of the repeater when the frequency fi is cut off, removing said frequency fd from said one end of said repeater, applying to the other end of the line a frequency fm wherein fd (fc+ fm) or (fc- fm), fm being a monitoring frequency in one band and fd being in the other band of said high and low bands, and fm having a level corresponding to the level at which the identification frequency fi is cut off, and measuring the level of the frequency fd received as a modulation product at said other end of said repeater.
Claim 16
Independent Claim
217 words
A method of monitoring the nonlinearity of a repeater in a transmission line having an amplifier and filter means for transmitting a high-frequency band in one direction and a low-frequency band in the opposite direction, the high and low-frequency bands being separated by an untransmitted intermediate band of frequencies, comprising the steps of applying to the input of said amplifier a characteristic frequency fc in the intermediate band and an identification frequency fi in the high-frequency band, applying to one end of said repeater a constant frequency fd, cutting-off the identification frequency fi when the level of the signal at the output of said amplifier has a predetermined value, measuring the gain of the line at the other end of the repeater when the frequency fi is cut off, removing said frequency fd from said one end of said repeater, applying to the other end of the line a frequency fm wherein fd (fc+ fm) or (fc- fm), fm being a monitoring frequency in one band and fd being in the other band of said high and low bands, and fm having a level corresponding to the level at which the identification frequency fi is cut off, and measuring the level of the frequency fd received as a modulation product at said other end of said repeater.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |