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US5909175A
Expired / Lapsed
US
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Connection switching circuit for ring system
Assignee: Fujitsu Ltd
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Filing: 1997-12-11
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Granted: 1999-06-01
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Expires: 2017-12-11
Abstract
Abstract A connection switching circuit is disposed in each node of a ring system in which a first ring and a second ring are provided with two communication lines which allow data to flow in a different direction respectively and is connected with a currently used passage and preliminary passage. The connection switching circuit comprises an alarm correction reading part for generating a control signal, an alarm monitor part for outputting respective alarm detection signals, a currently used/and preliminary alarm recognition part, and a switching control signal generation part for generating a control signal for selecting a passage, wherein either the currently used passage or the preliminary passage is selected by monitoring the alarm of the data which flows on the currently used passage or the preliminary passage to connect the first ring and the second ring with each other.
Inventors
- 👤 Shosaku Yamasaki
- 👤 Atsuki Taniguchi
- 👤 Kazuo Takatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:02
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/08; H04J3/085; H04J2203/00; H04J2203/0001; H04J2203/0057; H04J2203/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
267 words
A connection switching circuit to be used for a ring system in which a first ring including a first node and a second node, and a second ring including a third node and a fourth node are provided with two communication lines which allow data to flow in a different direction respectively, and the system is connected with a currently used passage connecting the first node and the third node and a preliminary passage connecting the second node and the fourth node, the circuit being disposed in said each node and comprising: an alarm correction reading part for generating a control signal for making a detour at a communication line within the same ring by using an alarm of the data which flows in the two communication lines when troubles of lines within the same ring generate; an alarm monitor part for outputting respective alarm detection signals by detecting an alarm which is generated in the currently used passage and the preliminary passage; a currently used and preliminary alarm recognition part for identifying whether the detected alarm is generated on the currently used passage and for outputting an identify signal by using the alarm detection signal; a switching control signal generation part for generating a control signal for selecting a passage to be used in the data transmission between the rings by using the identify signal, either the currently used passage or the preliminary passage being selected by monitoring the alarm of the data which flows on the currently used passage or the preliminary passage to connect the first ring and the second ring with each other.
Claim 2
Dependent Claim
267 words
A connection switching circuit to be used for a ring system in which a first ring including a first node and a second node, and a second ring including a third node and a fourth node are provided with two communication lines which allow data to flow in a different direction respectively, and the system is connected with a currently used passage connecting the first node and the third node and a preliminary passage connecting the second node and the fourth node, the circuit being disposed in said each node and comprising: an alarm correction reading part for generating a control signal for making a detour at a communication line within the same ring by using an alarm of the data which flows in the two communication lines when troubles of lines within the same ring generate; an alarm monitor part for outputting respective alarm detection signals by detecting an alarm which is generated in the currently used passage and the preliminary passage; a currently used and preliminary alarm recognition part for identifying whether the detected alarm is generated on the currently used passage and for outputting an identify signal by using the alarm detection signal; a switching control signal generation part for generating a control signal for selecting a passage to be used in the data transmission between the rings by using the identify signal, either the currently used passage or the preliminary passage being selected by monitoring the alarm of the data which flows on the currently used passage or the preliminary passage to connect the first ring and the second ring with each other.
Claim 3
Dependent Claim
86 words
The connection switching circuit according to claim 1, further comprising a concatenation control part for converting a control signal which is associated with other data which continues the front data by a control signal which is generated in the aforementioned switching control signal generation part and which is associated with the front data so that a plurality of data to be concatenated which flows between the first and second rings is data which is transmitted from either of the currently used passage or the preliminary passage.
Claim 4
Dependent Claim
55 words
The connection switching circuit according to claim 1, further comprising a test control part forcibly forming a generation state of an alarm irrespective of the presence of the generation of an actual alarm of the currently used passage and the preliminary passage and giving a suspected identification signal to the switching control signal generation part.
Claim 5
Dependent Claim
43 words
The connection switching circuit according to claim 1, wherein the switching control signal generation part is provided with a returning part for returning to the currently used passage on the basis of a forcible return control signal which is given from the outside.
Claim 6
Dependent Claim
31 words
The connection switching circuit according to claim 1, wherein the alarm monitor part is provided with a rewritable memory circuit which memorizes information indicative of a continuation time of the alarm.
Claim 7
Dependent Claim
37 words
A ring system having the connection switching circuit of claim 1 which is provided on each node on plurality of rings constituting an SDH interface network, wherein respective rings are mutually connected with the connection switching circuit.
Claim 8
Dependent Claim
15 words
A ring system according to claim 6, wherein the ring system is a BLSR type.
References Cited (Backward Citations)
US4716561A
Cited
US5440540A
Cited
US5442620A
Cited
US5406401A
Cited
US5394389A
Cited
US5406549A
Cited
US5491686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |