Patent US5757775A successfully refreshed from Google Patents.
US5757775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interface for detecting loss of call setup ATM cell to prevent misrouting in destination local network
Assignee: NEC Platforms Ltd
•
Filing: 1996-06-14
•
Granted: 1998-05-26
•
Expires: 2016-06-14
Abstract
Abstract An interface between an ATM network and a local network includes a cell disassembler for disassembling ATM cells from the ATM network and transmitting a disassembled signal to the local network. A cell assembler assembles a signal from the local network into ATM cells and transmitting the ATM cells to the ATM network. A cell loss detector is provided for detecting a loss of a cell in a series of ATM cells from the ATM network. A signaling cell detector detects a call setup ATM cell from the ATM network. A coincidence gate produces an output when there is a coincidence between the detection of the cell loss and the detection of the call setup ATM cell. When the coincidence is detected, a busy tone is supplied to the cell assembler, where it is assembled into ATM cells and transmitted to the ATM network.
Inventors
- 👤 Masaru Yokoyama
- 👤 Hajime Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:26
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5614; H04L2012/5615; H04L2012/5629; H04L2012/563; H04L2012/5638; H04L2012/5646; H04L2012/5652
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
An interface between an asynchronous transfer mode (ATM) network and a local network, comprising: a cell loss detector for detecting a cell loss in a series of ATM cells from the ATM network; a signaling cell detector for detecting a call setup ATM cell from the ATM network; a coincidence gate for detecting a coincidence between the detection of a cell loss by the cell loss detector and the detection of a call setup ATM cell by the signaling cell detector; and means for assembling an audible tone into ATM cells and transmitting the ATM cells to the ATM network when said coincidence is detected.
Claim 2
Dependent Claim
105 words
An interface between an asynchronous transfer mode (ATM) network and a local network, comprising: a cell loss detector for detecting a cell loss in a series of ATM cells from the ATM network; a signaling cell detector for detecting a call setup ATM cell from the ATM network; a coincidence gate for detecting a coincidence between the detection of a cell loss by the cell loss detector and the detection of a call setup ATM cell by the signaling cell detector; and means for assembling an audible tone into ATM cells and transmitting the ATM cells to the ATM network when said coincidence is detected.
Claim 3
Dependent Claim
15 words
An interface as claimed in claim 1, wherein said audible tone is a busy tone.
Claim 4
Dependent Claim
91 words
An interface as claimed in claim 1, wherein said cell loss detector comprises: a VCI/VPI (virtual channel identifier/virtual path identifier) detector for detecting VCI/VPI values from ATM cells received from the ATM network; a sequence count detector for detecting sequence count values from said ATM cells; and a discontinuity detector connected to the VCI/VPI detector and the sequence count detector for detecting a cell loss when there is a discontinuity in the sequence count values detected by the sequence count detector for a particular VPI/VCI value detected by the VCI/VPI detector.
Claim 5
Dependent Claim
140 words
An interface between an asynchronous transfer mode (ATM) network and a local network, comprising: a cell disassembler for disassembling ATM cells from the ATM network and transmitting a disassembled signal to the local network; a cell assembler for assembling a signal from the local network into ATM cells and transmitting the ATM cells to the ATM network; a cell loss detector for detecting a cell loss in a series of ATM cells from the ATM network; a signaling cell detector for detecting a call setup ATM cell from the ATM network; a coincidence gate for detecting a coincidence between the detection of a cell loss by the cell loss detector and the detection of a call setup ATM cell by the signaling cell detector; and means for supplying an audible tone to the cell assembler when said coincidence is detected.
Claim 6
Dependent Claim
140 words
An interface between an asynchronous transfer mode (ATM) network and a local network, comprising: a cell disassembler for disassembling ATM cells from the ATM network and transmitting a disassembled signal to the local network; a cell assembler for assembling a signal from the local network into ATM cells and transmitting the ATM cells to the ATM network; a cell loss detector for detecting a cell loss in a series of ATM cells from the ATM network; a signaling cell detector for detecting a call setup ATM cell from the ATM network; a coincidence gate for detecting a coincidence between the detection of a cell loss by the cell loss detector and the detection of a call setup ATM cell by the signaling cell detector; and means for supplying an audible tone to the cell assembler when said coincidence is detected.
Claim 7
Dependent Claim
15 words
An interface as claimed in claim 4, wherein said audible cone is a busy tone.
Claim 8
Dependent Claim
90 words
An interface as claimed in claim 4, wherein said cell loss detector comprises: a VCI/VPI (virtual channel identifier/virtual path identifier) detector for detecting VCI/VPI values from ATM cells received from the network; a sequence count detector for detecting sequence count values from said ATM cells; and a discontinuity detector connected to the VCI/VPI detector and the sequence count detector for detecting a cell loss when there is a discontinuity in the sequence count values detected by the sequence count detector for a particular VPI/VCI value detected by the VCI/VPI detector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |