Source: http://www.google.de/patents/US6600745
Timestamp: 2013-05-23 09:17:18
Document Index: 493973748

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1']

Patent US6600745 - Cell aligners - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Webprotokoll | Anmelden Erweiterte Patentsuche PatenteAn Asynchronous Transfer Mode (ATM) multiplexed data stream is terminated at a functional unit. Virtual channel data are being carried in cells in the data stream. A depacketizer has a plurality of cell buffers, each buffer storing the payload data contained in a single cell. The buffers are being loaded...http://www.google.de/patents/US6600745?utm_source=gb-gplus-sharePatent US6600745 - Cell aligners Ver�ffentlichungsnummerUS6600745 B1PublikationstypErteilung Anmeldenummer09/117,569 Ver�ffentlichungsdatum29. Juli 2003Eingetragen17. Jan. 1997 Priorit�tsdatum2. Febr. 1996Auch ver�ffentlicht unterCN1149765CCN1210640AEP0878071A1EP0878071B1WO1997028621A1 ErfinderGeoffrey ChoppingUrspr�nglich Bevollm�chtigterMarconi Communications LimitedEricsson AbM(Dgp1) LtdMarconi Uk Intellectual Property Ltd.Gpt Limited US-Klassifikation370/394370/395.1370/412Internationale KlassifikationH04L12/56H04L12/28H04Q11/04H04J3/06 UnternehmensklassifikationH04L2012/565H04L2012/5616H04J3/0632H04L2012/5674H04Q11/0478H04L2012/5681H04L2012/5652 Europ�ische KlassifikationH04Q 11/04S2H04J 3/06B6ReferenzenPatentzitate (11)Nichtpatentzitate (9) Referenziert von (3)Externe LinksUSPTO USPTO-Zuordnung EspacenetCell alignersUS 6600745 B1 Zusammenfassung An Asynchronous Transfer Mode (ATM) multiplexed data stream is terminated at a functional unit. Virtual channel data are being carried in cells in the data stream. A depacketizer has a plurality of cell buffers, each buffer storing the payload data contained in a single cell. The buffers are being loaded in sequence in accordance with a message sequence number carried by each cell and emptied in accordance with a depacketizer algorithm to form a non-continuous data stream. A fill-in cell format generator, on the failure of a valid cell to arrive, causes the replacement of the missing cell by a fill-in cell in the non-continuous data stream. A time-out function generator is started after each cell has been depacketized and sometimes after fill-in replacement cells have been generated.
BACKGROUND OF THE INVENTION Aligners have been used when terminating a synchronous multiplex. such as a framed 2048 kbit/s link, onto a clocked functional unit, where the clock of the functional unit and the synchronous multiplex cannot be assumed to be of the same frequency and phase.
SUMMARY OF THE INVENTION According to the present invention there is provided a method of terminating an Asynchronous Transfer Mode (ATM) multiplexed data stream at a depacketising functional unit, where virtual channel data not including a frame alignment signal is carried in cells in the data stream, each of the cells having a message sequence number, the method comprising aligning the cells using a plurality of cell buffers each storing the payload data contained in a single cell, the cell buffers being sequentially identified in accordance with the lower significant bits of the message sequence number, conditionally loading an appropriately identified cell buffer with each cell from the data stream in accordance with the lower significant bits of the message sequence number provided the message sequence number does not correspond to the message sequence number of the cell buffer currently being depacketised and is not more than a pre-determined number M of message sequence numbers in advance of the cell buffer being depacketised or an empty cell buffer being replaced by a fill-in cell; and emptying the cell buffers according to the conditions of a combined depacketiser and slip algorithm to form a continuous data stream aligned to the clock and frame start signal of the depacketising functional unit; on the failure of a valid cell to arrive replacing the missing cell by a fill-in cell in the continuous data stream by means of a fill-in cell format generator; and employing a time-out function which is cleared and restarted after each valid cell is received in order to cause a restart of the combined depacketiser and slip algorithm if the time-out should mature.
Electronics and Communications in Japan; Part I Commnunications; 76 (1993) December, No. 12, New York, US pp 14-26 �Cell Delay Variation Smoothing Methods for ATM based SDH Signal Transport System Hitoshi Uematsu and Hironi Ueda describes where if the synchronous digital hierarchy (SDH) signal is converted into asynchronous transfer mode (ATM) cells to be transmitted through the ATM transport network, the efficiency of the operation/management/maintenance of the network will be improved in addition to maintaining the economy and reliability of the network. This is one of the advantages of the ATM transport network.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The object of the present invention is to minimise the consequences of the extra delay and delay variation incurred by 64 kbit/s circuits when traversing Asynchronous Transfer Mode (ATM) networks as shown in FIG. 1.
Once the �trying to initialise� state has occurred, if a cell is then received with any sequence number, it is accepted and after a wait of 5.875 ms (2.875 ms or 2.000 ms) then depacketisation starts.
The �go to� indication confirms the full/empty states for the start of the next internal cell cycle.
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