US3859466A
Expired / Lapsed
US
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Reciprocal synchronization of oscillators of a time multiplex telephone communication network
Assignee: Siemens AG
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Filing: 1973-04-19
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Granted: 1975-01-07
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Expires: 1993-04-19
Abstract
Abstract A method and arrangement for reciprocally synchronizing oscillators provided in each of a plurality of exchange stations of a time multiplex long distance telecommunication network is described. Each oscillator emits synchronizing pulses in time slots usable for signal transmission by the corresponding exchange station. A discriminator is provided at each exchange station to which are applied synchronizing pulses of the oscillator pertaining thereto and synchronizing pulses of oscillators provided in other exchange stations connected therewith. The discriminator applies to the oscillator pertaining thereto a control potential to cause in a given case a change in its oscillating frequency. Synchronizing pulses emitted by the oscillator in each exchange station and the synchronizing pulses transmitted by the oscillators of other exchange stations are applied to frequency dividers connected to the discriminator. Application of output signals to the discriminator occurs after receipt of a specified number of synchronizing pulses by its frequency divider selectively begins or terminates. Output signals from other exchange stations to the discriminator of its exchange station are emitted with termination of the emission of output signals from another frequency divider connected to the oscillator provided in the exchange station in question.
Inventors
- 👤 Lothar Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:43
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0676
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
221 words
A method for reciprocally synchronizing oscillators provided in each of a plurality of exchange stations of a time multiplex long distance communication network, each said oscillator emitting synchronizing pulses in time slots usable for signal transmission in the exchange station, of which the said oscillator is a part, by employing a discriminator at each exchange station to which are applied synchronizing pulses of the oscillator pertaining thereto and synchronizing pulses of oscillators provided in other exchange stations connected therewith and which applies to the oscillator pertaining thereto a control potential to cause a change in the oscillating frequency of said oscillator comprising: applying the synchronizing pulses emitted by the oscillator in a given exchange station and the synchronizing pulses transmitteD by the oscillators of other exchange stations to frequency dividing means connected to inputs of the discriminator of each said exchange station, selectively starting or terminating application of output signals from said frequency dividing means to the discriminator after receipt of a specified number of synchronizing pulses by the frequency dividing means, emitting output signals from the frequency dividing stages receiving synchronizing pulses from other exchange stations to the discriminator in said given exchange station with termination of the emission of a corresponding output signal from a further frequency dividing means connected to the oscillator provided in said given exchange station.
Claim 2
Independent Claim
221 words
A method for reciprocally synchronizing oscillators provided in each of a plurality of exchange stations of a time multiplex long distance communication network, each said oscillator emitting synchronizing pulses in time slots usable for signal transmission in the exchange station, of which the said oscillator is a part, by employing a discriminator at each exchange station to which are applied synchronizing pulses of the oscillator pertaining thereto and synchronizing pulses of oscillators provided in other exchange stations connected therewith and which applies to the oscillator pertaining thereto a control potential to cause a change in the oscillating frequency of said oscillator comprising: applying the synchronizing pulses emitted by the oscillator in a given exchange station and the synchronizing pulses transmitteD by the oscillators of other exchange stations to frequency dividing means connected to inputs of the discriminator of each said exchange station, selectively starting or terminating application of output signals from said frequency dividing means to the discriminator after receipt of a specified number of synchronizing pulses by the frequency dividing means, emitting output signals from the frequency dividing stages receiving synchronizing pulses from other exchange stations to the discriminator in said given exchange station with termination of the emission of a corresponding output signal from a further frequency dividing means connected to the oscillator provided in said given exchange station.
Claim 3
Dependent Claim
100 words
The method according to claim 1, wherein the frequency dividing factor of the frequency dividing means is selected to be equal to the product of the network frequency desired in the entire long distance communication network and the delay time maximally appearing on the individual connection lines over which the synchronizing pulses are transmitted, but at least substantially equal to lambda /2 Delta f, wherein lambda represents the frequency bandwidth of the oscillator contained in the exchange station in each case, and Delta f the permissible frequency deviation from said desired network frequency after connection of the individual exchange stations.
Claim 4
Dependent Claim
216 words
An arrangement for reciprocally synchronizing finely tunable oscillators provided in each of a plurality of exchange stations of a time division multiplex long distance communication network, each said oscillator having a control input and emitting synchronizing pulses in time slots usable for signal transmission in the exchange station, of which it is a part comprising at each exchange station: a discriminator having a plurality of inputs and an output to which are applied synchronizing pulses of the oscillator in the exchange station and synchronizing pulses of oscillators provided in other exchange stations connected therewith and which applies to the oscillator in the exchange station a control potential to cause a change in the oscillating frequency of said oscillator in said exchange station, a frequency dividing stage at each exchange station interposed between an output of the oscillator in the exchange station and an input of the discriminator, further frequency dividing stages having a plurality of conditions indicative of the number of received synchronizing pulses, the remaining inputs of the discriminator being connected through said further frequency divider stages to adjacent exchange stations, applying synchronizing pulses thereto, said discriminator output being connected to the control input of the oscillator provided at the associated exchange station to apply control signals thereto to selectively vary the oscillating frequency thereof.
Claim 5
Dependent Claim
216 words
An arrangement for reciprocally synchronizing finely tunable oscillators provided in each of a plurality of exchange stations of a time division multiplex long distance communication network, each said oscillator having a control input and emitting synchronizing pulses in time slots usable for signal transmission in the exchange station, of which it is a part comprising at each exchange station: a discriminator having a plurality of inputs and an output to which are applied synchronizing pulses of the oscillator in the exchange station and synchronizing pulses of oscillators provided in other exchange stations connected therewith and which applies to the oscillator in the exchange station a control potential to cause a change in the oscillating frequency of said oscillator in said exchange station, a frequency dividing stage at each exchange station interposed between an output of the oscillator in the exchange station and an input of the discriminator, further frequency dividing stages having a plurality of conditions indicative of the number of received synchronizing pulses, the remaining inputs of the discriminator being connected through said further frequency divider stages to adjacent exchange stations, applying synchronizing pulses thereto, said discriminator output being connected to the control input of the oscillator provided at the associated exchange station to apply control signals thereto to selectively vary the oscillating frequency thereof.
Claim 6
Dependent Claim
95 words
The arrangement according to claim 3 further comprising: a control circuit assigned to each of said further frequency dividing states provided at each exchange station that receive synchronizing pulses from exchange stations adjacent thereto, the control circuit receiving output signals from said frequency dividing stage in the same exchange station that are to be applied to said durther frequency dividing stages of the exchange station, the control circuit emitting signals to said further frequency dividing stages to selectively cause reception of synchronizing signals thereby or reset said further frequency dividing stages to an initial condition.
Claim 7
Dependent Claim
42 words
The arrangement according to claim 3 wherein said further frequency dividing stages comprise counters which start or terminate the emission of an output signal to the discriminator in the same exchange station, upon counting a predetermined number of synchronizing pulses applied thereto.
Claim 8
Dependent Claim
35 words
The arrangement according to claim 3 wherein said discriminator comprises a sawtooth phase comparator circuit which emits output signals depending upon the relative phase differeNce between the leading or trailing edges of signals applied thereto.
Claim 9
Dependent Claim
105 words
The arrangement according to claim 6 wherein the sawtooth phase comparator circuit comprises sawtooth phase comparator stages that correspond in number to the number of the further frequency dividing stage provided in the same exchange station with regard to the relative phase positions of their leading or trailing edges, said arrangement further comprising: a common adding circuit connected to the outputs of the sawtooth phase comparator stages provided in each exchange station to derive the arthmetic mean-value of the outputs of said sawtooth phase comparator stages to produce a control potential thereat to regulate the frequency of the oscillator (Os) at the same exchange station.
Claim 10
Dependent Claim
26 words
The arrangement according to claim 7 further comprising an amplifier (V1, V2, V3) interposed between each of the sawtooth phase comparator stages and the adding circuit.
Claim 11
Dependent Claim
84 words
The arrangement according to claim 8 wherein each sawtooth phase comparator stage comprises a bistable switching stage having at lease one signal input and one synchronizing input and controllable between stable states in response to the leading or trailing edges of signals applied thereto, one of said further frequency dividing stages (Z1, Z2, Z3) that receives synchronizing pulses from other exchange stations being connected to the signal input and said frequency dividing stage in the same exchange station being connected to the synchronizing input.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |