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Patent US4937823A successfully refreshed from Google Patents.
US4937823A
Expired / Lapsed
US
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Ring network configuration
Assignee: Hitachi Ltd
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Filing: 1988-06-22
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Granted: 1990-06-26
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Expires: 2008-06-22
Abstract
Abstract In a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of line concentrators connected in the form of a loop by the two transmission lines and each accommodating a plurality of terminal stations connected to one of the two transmission lines, a signal detecting unit and a terminating circuit are disposed in each of the line concentrators on the signal output side of each of the transmission lines so as to be connectable to and disconnectable from the transmission lines, so that, when the signal detecting unit in one of the line concentrators is connected to the associated transmission line, the transmission line is disconnected in the line concentrator, and the terminating circuit is connected to the downstream segment of the disconnected transmission line.
Inventors
- 👤 Yoshinori Bekki
- 👤 Hiroyuki Wada
- 👤 Masato Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:54
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/437
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A line concentrator for use in a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of the line concentrators connected in the form of a loop by said two transmission lines and each accommodating a plurality of terminal stations connected to one of said two transmission lines, said line concentrator comprising: signal detecting means disposed on a signal output side of each of said transmission lines for detecting signals sent over the connected transmission line; terminating means disposed on the signal output side of each of said transmission lines for terminating the connected transmission line; and control means for disconnecting one of said transmission lines from the line concentrator while at the same time both connecting said signal detecting means associated to the disconnected transmission line and connecting said terminating means associated to a downstream segment of the disconnected transmission line.
Claim 2
Dependent Claim
152 words
A line concentrator for use in a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of the line concentrators connected in the form of a loop by said two transmission lines and each accommodating a plurality of terminal stations connected to one of said two transmission lines, said line concentrator comprising: signal detecting means disposed on a signal output side of each of said transmission lines for detecting signals sent over the connected transmission line; terminating means disposed on the signal output side of each of said transmission lines for terminating the connected transmission line; and control means for disconnecting one of said transmission lines from the line concentrator while at the same time both connecting said signal detecting means associated to the disconnected transmission line and connecting said terminating means associated to a downstream segment of the disconnected transmission line.
Claim 3
Dependent Claim
146 words
A ring network system comprising: two transmission lines transmitting a signal in directions opposite to each other; and a plurality of the line concentrators connected in the form of a loop by said two transmission lines and each accommodating a plurality of terminal stations connected to one of said two transmission lines, said line concentrator including: signal detecting means disposed on a signal output side of each of said transmission lines for detecting signals sent over the connected transmission line; terminating means disposed on the signal output side of each of said transmission lines for terminating the connected transmission line; and control means for disconnecting one of said transmission lines from the line concentrator while at the same time both connecting said signal detecting means associated to the disconnected transmission line and connecting said terminating means associated to a downstream segment of the disconnected transmission line.
Claim 4
Dependent Claim
146 words
A ring network system comprising: two transmission lines transmitting a signal in directions opposite to each other; and a plurality of the line concentrators connected in the form of a loop by said two transmission lines and each accommodating a plurality of terminal stations connected to one of said two transmission lines, said line concentrator including: signal detecting means disposed on a signal output side of each of said transmission lines for detecting signals sent over the connected transmission line; terminating means disposed on the signal output side of each of said transmission lines for terminating the connected transmission line; and control means for disconnecting one of said transmission lines from the line concentrator while at the same time both connecting said signal detecting means associated to the disconnected transmission line and connecting said terminating means associated to a downstream segment of the disconnected transmission line.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |