Patent US6574192B1 successfully refreshed from Google Patents.
US6574192B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communications network and an add and drop node
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1999-06-16
•
Granted: 2003-06-03
•
Expires: 2019-06-16
Abstract
Abstract A communications network comprising at least two nodes is disclosed. The network has two communication paths that carry traffic in opposite directions and work as a bi-directional bus. The network has a first inactive segment that carries no traffic and is arranged to allow the first inactive segment to be made active and another segment to be made inactive, especially in the case of fault in the other segment. The activation and inactivation logically “move” the first inactive segment. Additional protection paths are provided between the nodes.
Inventors
- 👤 Lars Egnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:27
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/413; H04J; H04J14/00; H04J14/02; H04J14/0201; H04J14/0202; H04J14/0204; H04J14/0205; H04J14/0215; H04J14/0217; H04J14/0278; H04J14/0283; H04J14/0287; H04J14/0289; H04J14/0291; H04L69/00; H04L69/40; H04L12/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A communications network comprising at least two nodes, the network having two communication paths, carrying traffic in opposite directions and working as a bi-directional bus, the network always having a first inactive segment carrying no traffic, comprising: detection means for detecting a faulty segment, when the faulty segment is not the first inactive segment, logic means for transferring the first inactive segment to the faulty segment by making the inactive segment active and the faulty segment inactive, disconnection means for disconnecting the first inactive segment from the bus, protecting links for creating a bypass connection over protection paths between the nodes which are on both sides of the faulty segment, means for making said bypass connection a part of the bus, and logic means for creating a second inactive segment on the bus.
Claim 2
Dependent Claim
133 words
A communications network comprising at least two nodes, the network having two communication paths, carrying traffic in opposite directions and working as a bi-directional bus, the network always having a first inactive segment carrying no traffic, comprising: detection means for detecting a faulty segment, when the faulty segment is not the first inactive segment, logic means for transferring the first inactive segment to the faulty segment by making the inactive segment active and the faulty segment inactive, disconnection means for disconnecting the first inactive segment from the bus, protecting links for creating a bypass connection over protection paths between the nodes which are on both sides of the faulty segment, means for making said bypass connection a part of the bus, and logic means for creating a second inactive segment on the bus.
Claim 3
Dependent Claim
39 words
The communications network according to claim 1 , wherein the first inactive segment contains a fault, then a connection is provided over protection paths bypassing the first inactive segment and a second inactive segment is provided on the bus.
Claim 4
Dependent Claim
19 words
The communications network according to claim 2 , wherein the second inactive segment is provided over the bypass connection.
Claim 5
Dependent Claim
19 words
The communications network according to claim 1 , wherein the protection paths are essentially parallel to the communication paths.
Claim 6
Dependent Claim
25 words
The communications network according to claim 1 , wherein the protection paths are coupled via multi-direction cross points to form a net between the nodes.
Claim 7
Independent Claim
127 words
A method for fault handling in a communication network comprising at least two nodes, the network having two communication paths, carrying traffic in opposite directions and working as a bi-directional bus, the network always having a first inactive segment carrying no traffic, comprising the steps of detecting a faulty segment, when the faulty segment is not the first inactive segment, logically “moving” the first inactive segment to the faulty segment by making the first inactive segment active and the faulty segment inactive, disconnecting the first inactive segment from the bus, creating a bypass connection over protection paths between the nodes which are on both sides of the faulty segment, making said bypass connection a part of the bus, and creating a second inactive segment on the bus.
Claim 8
Independent Claim
127 words
A method for fault handling in a communication network comprising at least two nodes, the network having two communication paths, carrying traffic in opposite directions and working as a bi-directional bus, the network always having a first inactive segment carrying no traffic, comprising the steps of detecting a faulty segment, when the faulty segment is not the first inactive segment, logically “moving” the first inactive segment to the faulty segment by making the first inactive segment active and the faulty segment inactive, disconnecting the first inactive segment from the bus, creating a bypass connection over protection paths between the nodes which are on both sides of the faulty segment, making said bypass connection a part of the bus, and creating a second inactive segment on the bus.
Claim 9
Dependent Claim
18 words
The method according to claim 6 , wherein the second inactive segment is created over the bypass connection.
References Cited (Backward Citations)
WO1996024998A1
Cited
WO1996031025A1
Cited
US6049405A
Cited
US5680235A
Cited
US6088141A
Cited
WO1997001905A1
Cited
EP0765051A2
Cited
EP0769859A1
Cited
US6233704B1
Cited
WO1999003230A1
Cited
US6046832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-06-02 | 2006-12-02 | 2007-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-02 | 2010-12-02 | 2011-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-02 | 2014-12-02 | 2015-06-03 | $7700.00 | Window Closed / Lapsed |