US5859836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternate ring restoration technique
Assignee: AT&T Inc
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Filing: 1996-07-29
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Granted: 1999-01-12
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Expires: 2016-07-29
Abstract
Abstract Traffic in a multiple ring transmission system (10) is advantageously routed via alternate rings (12a, 12c and 12d) should a ring (12b) fail. Upon the failure of a ring, a hunt is first undertaken to establish the available restoration capacities within the rings. Next, a selected set of available restoration capacities is reserved (selected) to optimize the transmission of traffic between a destination node (14a) and an origin node (14f). The selected set of restoration capacities are then cross-connected to route traffic between the origin and destination nodes.
Inventors
- 👤 Hossein Eslambolchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:37
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02; H04J; H04J3/00; H04J3/02; H04J3/08; H04J3/085; H04L12/00; H04L12/28; H04L12/42; H04L12/437; H04L5/00; H04L5/14; H04L5/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
In connection with a transmission system for carrying telecommunications traffic, said system comprised of multiple, interconnected rings, each comprised of at least two nodes, each node linked to each of a pair of neighboring node by, at least one main link, a method for restoring traffic upon the failure of at least one link in a ring, comprising the steps of: (a) hunting among the rings for available restoration capacities for carrying restoration traffic; (b) reserving, among the available restoration capacities, a selected set of restoration capacities that optimizes restoration traffic, the set selected among the available restoration capacities to minimize overall length and node crossings; and (c) cross-connecting said selected set of restoration capacities to establish a route for carrying restoration traffic.
Claim 2
Dependent Claim
123 words
In connection with a transmission system for carrying telecommunications traffic, said system comprised of multiple, interconnected rings, each comprised of at least two nodes, each node linked to each of a pair of neighboring node by, at least one main link, a method for restoring traffic upon the failure of at least one link in a ring, comprising the steps of: (a) hunting among the rings for available restoration capacities for carrying restoration traffic; (b) reserving, among the available restoration capacities, a selected set of restoration capacities that optimizes restoration traffic, the set selected among the available restoration capacities to minimize overall length and node crossings; and (c) cross-connecting said selected set of restoration capacities to establish a route for carrying restoration traffic.
Claim 3
Dependent Claim
101 words
The method according to claim 1 wherein the step of hunting for available restoration capacity comprises the steps of: (a) flooding a first packet of information from a first node associated with a fail link to at least one neighboring node to cause said neighboring node to ascertain its available restoration capacity; (b) flooding a subsequent packet of information from said neighboring node to at least one of its neighboring node to cause it ascertain its available restoration capacity; and (c) repeating step (b) until the nodes are successively flooded with packets to establish the available restoration capacities within the system.
Claim 4
Dependent Claim
17 words
The method according to claim 1 wherein the restoration capacities in said selected set are cross-connected automatically.
Claim 5
Dependent Claim
17 words
The method according to claim 1 wherein the restoration capacities in said selected set are cross-connected manually.
Claim 6
Dependent Claim
173 words
In connection with a transmission system for carrying telecommunications traffic, said system comprised of multiple, interconnected rings, each comprised of at least two nodes, each node linked to each of a pair of neighboring node by at least one main link, a method for restoring traffic upon the failure of at least one link in a ring, comprising the steps of: (a) flooding a first packet of information from a first node associated with a failed link to at least one neighboring node to cause it to ascertain its available restoration capacity; (b) flooding a successive packet of information from said neighboring node to its neighboring node to cause it to ascertain its available restoration capacity; (c) repeating step (b) until the nodes have been flooded with packets and the available restoration capacities determined; (d) reserving among the established restoration capacities, a selected set of reservation capacities whose overall length and node crossings are minimized; and (e) cross-connecting said selected set of restoration capacities to yield an optimal path for carrying restoration traffic.
Claim 7
Dependent Claim
173 words
In connection with a transmission system for carrying telecommunications traffic, said system comprised of multiple, interconnected rings, each comprised of at least two nodes, each node linked to each of a pair of neighboring node by at least one main link, a method for restoring traffic upon the failure of at least one link in a ring, comprising the steps of: (a) flooding a first packet of information from a first node associated with a failed link to at least one neighboring node to cause it to ascertain its available restoration capacity; (b) flooding a successive packet of information from said neighboring node to its neighboring node to cause it to ascertain its available restoration capacity; (c) repeating step (b) until the nodes have been flooded with packets and the available restoration capacities determined; (d) reserving among the established restoration capacities, a selected set of reservation capacities whose overall length and node crossings are minimized; and (e) cross-connecting said selected set of restoration capacities to yield an optimal path for carrying restoration traffic.
Claim 8
Dependent Claim
17 words
The method according to claim 5 wherein the restoration capacities in said selected set are cross-connected automatically.
Claim 9
Dependent Claim
17 words
The method according to claim 5 wherein the restoration capacities in said selected set are cross-connected manually.
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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) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |