Frogging signal repeater for a transmission line communications system
First Claim
1. A communication system for transmitting information in both directions over a transmission line including a communication means connected to each end of the transmission line and a frogging repeater means connected to the transmission line intermediate the two communication means, each communication means transmitting at least two information carrier signals, one of said carrier signals being at a first predetermined frequency higher than a second predetermined frequency of another one of said carrier signals, and receiving at least two information carrier signals, one of said carrier signals being at a third predetermined frequency higher than a fourth predetermined frequency of another one of said carrier signals, the frogging repeater means comprising:
- means responsive to at least the second frequency signal transmitted by one of the communication means for generating a first coordination reference signal representing the length of the transmission line between the repeater means and the one communication means; and
means responsive to the first and second frequency signals transmitted by the other communication means, a reference signal at a predetermined frequency and said first coordination reference signal for generating the third and fourth frequency signals respectively to the one communication means each at a magnitude whereby the one communication means receives the third and fourth frequency signals at a predetermined magnitude.
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Accused Products
Abstract
A frogging signal repeater for a transmission line communications system such as a telephone system having a trunk line connected between a pair of signal sources such as end central offices and/or standard signal repeaters. Each signal source generates information signals on a group of relatively high frequency carrier signals and receives information signals on a group of relatively low frequency carrier signals with the frogging signal repeater connected in the trunk line for translating the high and low frequency groups. The repeater includes means responsive to a high frequency group signal from one signal source for generating a coordination reference signal representing the length of the transmission line between the repeater and the one signal source and means responsive to the coordination reference signal and the high frequency group signals from the other signal source for generating the low frequency group signals to the one signal source whereby the low frequency group signals arrive at the one signal source at a predetermined magnitude.
26 Citations
23 Claims
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1. A communication system for transmitting information in both directions over a transmission line including a communication means connected to each end of the transmission line and a frogging repeater means connected to the transmission line intermediate the two communication means, each communication means transmitting at least two information carrier signals, one of said carrier signals being at a first predetermined frequency higher than a second predetermined frequency of another one of said carrier signals, and receiving at least two information carrier signals, one of said carrier signals being at a third predetermined frequency higher than a fourth predetermined frequency of another one of said carrier signals, the frogging repeater means comprising:
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means responsive to at least the second frequency signal transmitted by one of the communication means for generating a first coordination reference signal representing the length of the transmission line between the repeater means and the one communication means; and means responsive to the first and second frequency signals transmitted by the other communication means, a reference signal at a predetermined frequency and said first coordination reference signal for generating the third and fourth frequency signals respectively to the one communication means each at a magnitude whereby the one communication means receives the third and fourth frequency signals at a predetermined magnitude. - View Dependent Claims (2, 3, 4)
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- 5. A system according to claim 5 wherein said means for generating signals at the third and fourth frequencies includes means responsive to the magnitudes of the third and fourth frequency signals for generating the third and fourth frequency signals at the same predetermined magnitude and means responsive to the third and fourth frequency signals at said same predetermined magnitude and to a second coordination reference signal for generating the third and fourth frequency signals each at a magnitude whereby the other communication means receives the third and fourth frequency signals at said predetermined magnitude and wherein said repeater means includes means responsive to at least the second frequency signal transmitted by the other communication means for generating said second coordination reference signal representing the length of the transmission line between the repeater means and the other communication means.
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8. In a telephone communication system including a trunk line connected between two central offices each office including communication means for transmitting a high frequency group of carrier signals and receiving a low frequency group of carrier signals and a frogging repeater means inserted in the trunk line for translating the high frequency carrier signals to the low frequency signals, the frogging repeater means comprising:
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means responsive to at least one of the high frequency carrier signals from one office for generating a first coordination reference signal representing the length of the trunk line between the repeater means and the one office; and means responsive to said first coordination reference signal, the high frequency group carrier signals transmitted by the other office and a signal having a predetermined reference frequency for generating the low frequency group carrier signals to the one office whereby the low frequency group carrier signals are received at a predetermined magnitude. - View Dependent Claims (9, 10)
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11. In a plural channel telephone trunk line communication system including a signal source connected to each end of the trunk line for transmitting a plurality of different frequency, different magnitude AM modulated carrier signals in a high frequency band and for receiving a plurality of AM modulated carrier signals in a low frequency band and a frogging signal repeater inserted in the trunk line intermediate the two signal sources for translating the high frequency band signals received from each source to the low frequency band signals to be transmitted to each source, the frogging signal repeater comprising:
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(a) means responsive to the lowest frequency low frequency band carrier signal translated for transmission to the one signal source for amplifying the high frequency band carrier signals received from the other signal source at a gain whereby said lowest frequency carrier signal is maintained at a first predetermined magnitude; (b) means responsive to a signal having a predetermined reference frequency for translating said amplified high frequency band carrier signals to the low frequency band carrier signals for transmission to said one signal source; (c) means responsive to the highest frequency low frequency band carrier signal for transmission to said one signal source and said translated carrier signals for generating the low frequency band carrier signals for transmission to said one signal source at said first predetermined magnitude; and (d) means responsive to at least one of the high frequency band carrier signals received from said one signal source and said first predetermined magnitude carrier signals for generating the low frequency band carrier signals for transmission to said one signal source whereby the low frequency band carrier signals are received at said one signal source at a second predetermined magnitude. - View Dependent Claims (12, 13, 14, 15)
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16. A frogging repeater connected between first and second transmission lines for receiving from each of said lines a plurality of first carrier signals each associated with a respective one of a plurality of first frequencies and transmitting on each of said lines a plurality of second carrier signals each associated with a respective one of a plurality of second frequencies, the frogging repeater comprising:
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(a) means responsive to at least one of said first carrier signals received on said first transmission line for generating a first coordination reference signal representing the length of said first line; and (b) means responsive to said first signals received on said second line, a reference signal of predetermined frequency and said first coordination reference signal for generating for transmission on said first transmission line said second carrier signals each of said second carrier signals having a magnitude which is a function of the length of said first transmission line and the frequency of said carrier signals. - View Dependent Claims (17)
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18. In a system for transmitting between two communication means a plurality of information carrier signals simultaneously in both directions over a transmission line each of said communication means transmitting at least two of the carrier signals in a first predetermined frequency band and receiving at least two of the carrier signals in a second predetermined frequency band, one of the communication means connected to each end of the transmission line and frogging repeater means connected to the transmission line intermediate the two communication means, the frogging repeater means comprising:
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(a) means responsive to at least one of the first frequency band signals transmitted by one of the communication means for generating a first coordination reference signal representing the length of the transmission line between the frogging repeater means and the one communication means; and (b) means responsive to the first frequency band signals transmitted by the other communication means, a reference signal at a predetermined frequency and said first coordination reference signal for generating said second frequency band signals for transmission to said one communication means said second frequency band signals having a magnitude which is a function of the length of the transmission line between the repeater means and the one communication means whereby the one communication means receives the second frequency band signals at a predetermined magnitude. - View Dependent Claims (19, 20)
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21. A frogging repeater connected between first and second transmission lines for receiving from each of said lines a plurality of first carrier signals each associated with a respective one of a plurality of first frequencies and transmitting on each of said lines a plurality of second carrier signals each associated with a respective one of a plurality of second frequencies, the frogging repeater comprising:
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(a) means responsive to at least one of said first carrier signals received on said first transmission line for generating a first coordination reference signal representing the length of said first line; (b) means responsive to said first signals received on said second line and a reference signal at a predetermined frequency for generating at a substantially constant and equal amplitude said plurality of second carrier signals; and (c) means responsive to said amplitude equalized second carrier signals and said first coordination reference signal to thereby control the amplitude of said second carrier signals as a function of the length of said first transmission line and the frequency of said carrier signals said second carrier signals being transmitted on said first line. - View Dependent Claims (22)
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23. In a system for transmitting between two communication means a plurality of information carrier signals simultaneously in both directions over a transmission line each of said communication means transmitting at least two of the carrier signals in a first predetermined frequency band and receiving at least two of the carrier signals in a second predetermined frequency band, one of the communication means connected to each end of the transmission line, and frogging repeater means connected to the transmission line intermediate the two communication means, the frogging repeater means comprising:
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(a) means responsive to at least one of the first frequency band signals transmitted by one of the communication means for generating a first coordination reference signal representing the length of the transmission line between the frogging repeater means and the one communication means; (b) means responsive to the first frequency band signals transmitted by the other communication means and a reference signal at a predetermined frequency for generating at a substantially constant and equal amplitude the second frequency band signals to the one communication means; and (c) means responsive to said first coordination reference signal for controlling the amplitude of said second frequency band signals as a function of the length of the transmission line between the repeater means and the one communication means whereby the one communication means receives the second frequency band signals at a predetermined magnitude.
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Specification