EP0138693A1
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EP
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Method and apparatus for supervising digital radio transmission line
Assignee: Fujitsu Ltd
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Filing: 1984-10-04
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Granted: —
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Expires: 2004-10-04
Abstract
Abstract A supervisory system for a digital radio transmission line distributed between a transmitter part and a receiver part. The receiver part produces error pulses from a code signal for error rate detection sent from the transmitter part; each time interval between two successive error pulses (appearing at 30) is measured (31, 32, 33) and the measured time intervals are processed (34, 39) to estimate the transmission line quality in accordance with the variation of said time intervals between two successive error pulses, and to issue (on 21) a line switching command.
Inventors
- 👤 Masahisa Kawai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 13:08
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/02; G01R29/027; G01R29/033; G01R23/00; G01R23/02; G01R23/15; H; H04; H04L; H04L1/00; H04L1/24; H04L1/241; H04L1/242
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A method for supervising a digital radio transmission line distributed between a transmitter part and a receiver part, in which the transmitter part transmits data signals together with code signals for error rate detection to the receiver part, the receiver part receives the code signals for error rate detection, produces error pulses from the code signals and supervises the transmission line quality based on the thus produced error pulses so as to issue a line switching command when the detected error rate exceeds a predetermined threshold value, wherein the method comprises the steps of: (a) measuring time intervals of each two successive error pulses, and; (b) determining a time for issuing the line switching command in accordance with the variation of the thus measured time intervals.
Claim 2
Independent Claim
126 words
A method for supervising a digital radio transmission line distributed between a transmitter part and a receiver part, in which the transmitter part transmits data signals together with code signals for error rate detection to the receiver part, the receiver part receives the code signals for error rate detection, produces error pulses from the code signals and supervises the transmission line quality based on the thus produced error pulses so as to issue a line switching command when the detected error rate exceeds a predetermined threshold value, wherein the method comprises the steps of: (a) measuring time intervals of each two successive error pulses, and; (b) determining a time for issuing the line switching command in accordance with the variation of the thus measured time intervals.
Claim 3
Dependent Claim
33 words
A method as set forth in claim 1, wherein, in the step (b), said variation of the measured time interval is detected in the form of a changing ratio of the error pulses.
Claim 4
Dependent Claim
40 words
A method as set forth in claim 2, wherein the time for issuing the line switching command is determined by forecasting an access to the predetermined threshold value of the error rate from the changing ratio of the error pulses.
Claim 5
Independent Claim
145 words
An apparatus for supervising a digital radio transmission line distributed between a transmitter part and a receiver part, in which the transmitter part transmits a data signal together with a code signal for error rate detection, the receiver part receives the code signal, produces error pulses from the code signal and supervises the transmission line quality based on the thus produced error pulses so as to issue a line switching command when the detected error rate exceeds a predetermined threshold value, wherein the apparatus comprises a comparison unit which receives, on one hand, a first number obtained by counting the received error pulses and, on the other hand, a second number produced in accordance with the time intervals of each two successive error pulses, so as to produce the line switching command therefrom when the first number and the second number coincide with each other.
Claim 6
Independent Claim
145 words
An apparatus for supervising a digital radio transmission line distributed between a transmitter part and a receiver part, in which the transmitter part transmits a data signal together with a code signal for error rate detection, the receiver part receives the code signal, produces error pulses from the code signal and supervises the transmission line quality based on the thus produced error pulses so as to issue a line switching command when the detected error rate exceeds a predetermined threshold value, wherein the apparatus comprises a comparison unit which receives, on one hand, a first number obtained by counting the received error pulses and, on the other hand, a second number produced in accordance with the time intervals of each two successive error pulses, so as to produce the line switching command therefrom when the first number and the second number coincide with each other.
Claim 7
Dependent Claim
88 words
An apparatus as set forth in claim 4, wherein the first number'is supplied from an up/down counter unit for achieving an up count every time the error pulse is given thereto at an up count input, and the second number is supplied from a memory unit which stores the first number which has been renewed to the least value by a time comparison unit containing therein an ROM which stores information sets defining a relationship between each time interval of the error pulses and the corresponding second number.
Claim 8
Dependent Claim
43 words
An apparatus as set forth in claim 5, wherein, the second number is accessed, in the ROM, in response to data concerning each time interval produced by a time interval counter unit which is driven by clock pulses supplied from a clock generator.
Claim 9
Dependent Claim
63 words
An apparatus as set forth in claim 6, wherein the time interval counter unit is provided with an overflow detection unit which detects an overflow of the count member at the time interval counter unit, the overflow detection signal is supplied to reset, the count number of the time interval counter unit and to the down count input of the up/down counter unit.
Claim 10
Dependent Claim
52 words
An apparatus as set forth in claim 7, wherein the overflow detection signal is supplied, via an OR circuit, to the time interval counter unit, the OR circuit also receives the error pulses and resets the time interval counter unit every time the error pulse or the overflow detection signal is generated.
Claim 11
Dependent Claim
230 words
An apparatus as set forth in claim 8, wherein a counter unit is mounted to connect with the overflow detection unit, the time interval comparison unit and the memory unit, which counter unit counts the number of the overflow detection signals given from the unit 34 and resets the gist of the memory unit every time the count number of the overflow detection signals reaches a predetermined number suitable for assuring a trend indicating that the error rate is gradually decreasing, and where the overflow detection signal is not supplied to the counter unit, the gist of the memory unit is not reset but is renewed by the least value from the time comparison unit and is maintained in the memory unit, the counter unit further operates to transfer a discrimination signal, via a line, to the time comparison unit, which discrimination signal reveals whether the reset operation for the time interval counter unit is caused by the error pulse given to a first input of the OR circuit or the overflow detection signal given to a second input thereof, wherein, in the former case, the time comparison unit produces the number corresponding to the time interval from the time interval counter unit in accordance with the information sets of the ROM and, in the latter case, the time comparison unit produces the largest second number stored in the ROM.
References Cited (Backward Citations)
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