Patent DE682891C successfully refreshed from Google Patents.
EP0133760A2
Expired / Lapsed
EP
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Transmission line control system
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-07-13
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Granted: —
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Expires: 2004-07-13
Abstract
Abstract The transmission line control system according to the invention is capable of disconnecting and reconnecting a terminal communication apparatus (S 1 ,S 2 ..S 1 ) from and to a main transmission line (L) reliably and quickly on such occurrences as a fault on the line, correction of the fault, and cutting off and turning on of a power source. The control system includes, for each terminal communication apparatus, two subsidiary communication lines (M 1 ,M 2 ), a by-pass (BP j ), two signal monitoring devices (W 1 ,W 2 ), and four change-over switches (C,-C 4 ). Each signal monitoring device monitors a data signal passing through the subsidiary transmission lines and controls the switching operation of the change-over switches so that, upon occurrence of a line fault or a disconnection of the power source, only the terminal communication apparatus related to the trouble is disconnected from the main transmission line and that, upon correction of the line fault or turning on of the power source, that terminal communication apparatus is reconnected to the main transmission line. In order to perform such control operation properly, constants deciding the lengths of time of operation of the signal monitoring devices are determined to satisfy given inequalities.
Inventors
- 👤 Susumu C/O Osaka Works Ihara
- 👤 Shinji C/O Osaka Works Tsunoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:23
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/28; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/437
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
555 words
A transmission line control system comprising a plurality of terminal communication apparatuses (S 1 , S 2 ...Si) for receiving data signals; and a main transmission line (L) for connecting the terminal communication apparatuses continuously; characterised by an input side subsidiary transmission line (M 1 ) for connecting an input side section (L i ) of the main transmission line to the terminal communication apparatus; an output side subsidiary transmission line (M 2 ) for connecting an output side section (L i + 1 ) of the main transmission line to the terminal communication apparatus; a by-pass (BP i ) for connecting the input side section of the main transmission line to the output side section thereof; a first change-over switch (C 1 ) provided on the output side subsidiary transmission line for connecting the subsidiary transmission line alternatively to the output of the terminal communication apparatus or earth; a second change-over switch (C 2 ) provided on an input side section of the main transmission line, for connecting the input side section of the main transmission line alternatively to the by-pass or the input side subsidiary transmission line; a third change-over switch (C 3 ) provided on a section of the main transmission line between the input side subsidiary transmission line and the output side subsidiary transmission line, for opening and closing the connection between the input side and the output side subsidiary transmission lines; a fourth change-over switch (C 4 ) provided on the output side section of the main transmission line, for connecting the output side section of the main transmission line altrnatively to the by-pass or the output side subsidiary transmission line; a first signal monitoring device (W 1 ) for monitoring the data signal of the input side subsidiary transmission line to change the first change-over switch when the data signal has been received continuously for a length of time T on 1, or for a length of time T hold 1 after a power source of the terminal for supplying power to the terminal communication apparatus was turned on; and a second signal monitoring device (W 2 ) for monitoring the data signal of the output side subsidiary transmission line to change the second, third and fourth change-over switches so as to connect the input side section of the main transmission line to the input side subsidiary transmission line and the output side subsidiary transmission line to the output side section of the main transmission line and to disconnect the input side subsidiary transmission line from the output side subsidiary transmission line when receiving the data signal for a length of time T on 2 continuously, and to change the second, third and fourth change-over switches so as to connect the input side section and the output side section of the main transmission line to the by-pass and to connect the input side and the output side subsidiary transmission lines to each other when receiving no data signal for a length of time T off 2 continuously, in which the constants deciding the lengths of time of operation of the first and second signal monitoring time of operation of the first and second signal monitoring devices are determined to satisfy the following inequalities: where Tw denotes the largest length of time of continuous absence of signal in normal operation.
Claim 2
Dependent Claim
555 words
A transmission line control system comprising a plurality of terminal communication apparatuses (S 1 , S 2 ...Si) for receiving data signals; and a main transmission line (L) for connecting the terminal communication apparatuses continuously; characterised by an input side subsidiary transmission line (M 1 ) for connecting an input side section (L i ) of the main transmission line to the terminal communication apparatus; an output side subsidiary transmission line (M 2 ) for connecting an output side section (L i + 1 ) of the main transmission line to the terminal communication apparatus; a by-pass (BP i ) for connecting the input side section of the main transmission line to the output side section thereof; a first change-over switch (C 1 ) provided on the output side subsidiary transmission line for connecting the subsidiary transmission line alternatively to the output of the terminal communication apparatus or earth; a second change-over switch (C 2 ) provided on an input side section of the main transmission line, for connecting the input side section of the main transmission line alternatively to the by-pass or the input side subsidiary transmission line; a third change-over switch (C 3 ) provided on a section of the main transmission line between the input side subsidiary transmission line and the output side subsidiary transmission line, for opening and closing the connection between the input side and the output side subsidiary transmission lines; a fourth change-over switch (C 4 ) provided on the output side section of the main transmission line, for connecting the output side section of the main transmission line altrnatively to the by-pass or the output side subsidiary transmission line; a first signal monitoring device (W 1 ) for monitoring the data signal of the input side subsidiary transmission line to change the first change-over switch when the data signal has been received continuously for a length of time T on 1, or for a length of time T hold 1 after a power source of the terminal for supplying power to the terminal communication apparatus was turned on; and a second signal monitoring device (W 2 ) for monitoring the data signal of the output side subsidiary transmission line to change the second, third and fourth change-over switches so as to connect the input side section of the main transmission line to the input side subsidiary transmission line and the output side subsidiary transmission line to the output side section of the main transmission line and to disconnect the input side subsidiary transmission line from the output side subsidiary transmission line when receiving the data signal for a length of time T on 2 continuously, and to change the second, third and fourth change-over switches so as to connect the input side section and the output side section of the main transmission line to the by-pass and to connect the input side and the output side subsidiary transmission lines to each other when receiving no data signal for a length of time T off 2 continuously, in which the constants deciding the lengths of time of operation of the first and second signal monitoring time of operation of the first and second signal monitoring devices are determined to satisfy the following inequalities: where Tw denotes the largest length of time of continuous absence of signal in normal operation.
Claim 3
Dependent Claim
76 words
A system as claimed in claim 1,. characterised in that the first signal monitoring device (W 1 ) includes a first initially set switch (Il); and in that the first signal monitoring device changes the first change-over switch (C 1 ) so as to connect the terminal communication apparatus (S.) to the output side subsidiary transmission line (M 2 ) for the length of time T hold 1 since the first initially set switch was closed.
Claim 4
Dependent Claim
162 words
A system as claimed in claim 1 or claim 2, characterised in that the second signal monitoring device (W 2 ) includes a second initially set switch (I 2 ); in that the second signal monitoring device changes the second, third and fourth change-over switches (C 1 ,C 3 ,C 4 ) so as to connect the input side section (L.) of the main transmission line (L) to the input side subsidiary transmission line (M 1 ) and the output side subsidiary transmission line (M 2 ) to the output side section (L i + 1 ) of the main transmission line, and to disconnect the input side subsidiary transmission line from the output side subsidiary transmission line for the length of time T hold 2 since the second initially set switch was closed; and in that the time constants deciding the lengths of time of operation of the first and second signal monitoring devices are determined to satisfy the following inequalities:
Claim 5
Independent Claim
36 words
A system as claimed in any preceding claims, characterised in that the terminal communication apparatuses (S 1 ,S 2 ...S i ) are connected to each other in a ring by the main transmission line (L).
Claim 6
Independent Claim
34 words
A system as claimed in any one of claims 1-3, characterised in that the terminal communication apparatuses (S 1 ,S 2 ,...S i ) are connected in a string by the main transmission line.
Claim 7
Independent Claim
62 words
A system as claimed in any preceding claim, characterised in that the first and second signal monitoring devices (W 1 ,W 2 ) include "on" time counters (17) for setting the lengths of time T on 1 and T on 2, respectively, and corresponding "off" time counters (21) for setting the lengths of time T off 1 and T off 2, respectively.
References Cited (Backward Citations)
No citation records indexed.
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