EP0448074A3

Synchronization circuit for atm cells

Abstract

A synchronization circuit for ATM cells transferred in an ATM communication system, wherein the synchronization circuit receives and holds in a bit serial manner the input bit trains constituting the received ATM cells by a shift register unit, performs a CRC operation in a bit serial manner on the held input bit trains by a continuous CRC arithmetic unit in accordance with a simplified CRC operation process different from the usual CRC operation process, and performs the necessary synchronization control upon receiving the CRC arithmetic operation result at a synchronization control unit, thereby enabling CRC arithmetic operations to be performed continuously and by simple hardware on the headers in the ATM cells.

EP0448074A3, drawing sheet 1 — Sheet 1 of 1

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Projected expiry passed 20 March 2011, 15.5 years ago.

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Citations
Document	Relation	Office	Category	Cited during
EP0280914A2	Cites	European Patent Office (EPO)	A	Search report
US3336467A	Cites	United States of America	A	Search report
IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE vol. 1, 28 November 1988, HOLLYWOOD (US) pages 394 - 402 D.P. HSING ET AL. 'On cell size and header error control of asynchronous transfer mode (ATM).'	Non-patent	–	–	Search report
ELECTRONIC LETTERS vol. 19, no. 3, 3 February 1983, HITCHIN (GB) pages 109 - 110 S.R. ELY ET AL. 'High-speed decoding technique for slip detection in data transmission systems using modified cyclic block codes.'	Non-patent	–	–	Search report

9 members in 5 offices

This recordMember, by publication datePriority claim

Priority claims4

Priority claims
Document	Office	Kind	Date
6804990	Japan	–	1990-03-20
6804990	Japan	A	1990-03-20
6804990	Japan	A	1990-03-20
JP19900068049	–	–	–

Members9

Family members, oldest first
Document	Office	Kind
CA2038592A1	Canada	A1	1991-09-21
EP0448074A2	European Patent Office (EPO)	A2	1991-09-25
JPH04211547A	Japan	A	1992-08-03
EP0448074A3This record	European Patent Office (EPO)	A3	1993-01-27
US5282215A	United States of America	A	1994-01-25
CA2038592C	Canada	C	1995-11-21
EP0448074B1	European Patent Office (EPO)	B1	1998-06-10
DE69129558D1	Germany	D1	1998-07-16
DE69129558T2	Germany	T2	1998-12-10

26 legal events, as 3 offices reported them to INPADOC

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	Event	Code	Office
2008-04-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2007-11-28	Gb: european patent ceased through non-payment of renewal feeCeasedGBPC	GBPC	EP
2006-03-15	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2005-01-07	Notification of lapseLapsedST	ST	FR
2004-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2004-10-01	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2003-03-27	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2003-03-10	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2002-01-01	European patent in force as of 2002-01-01IF02	IF02	GB
1999-06-02	No opposition filedOpposition26N	26N	EP
1999-04-16	No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE	PLBE	EP
1999-04-16	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA	STAA	EP
1998-10-09	Fr: translation filedET	ET	EP
1998-07-16	Corresponds to:REF	REF	EP
1998-06-10	Designated contracting statesAK	AK	EP
1998-04-24	(expected) grantORIGINAL CODE: 0009210GRAA	GRAA	EP
1998-02-06	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH	GRAH	EP
1997-10-28	Despatch of communication of intention to grantORIGINAL CODE: EPIDOS AGRAGRAG	GRAG	EP
1997-10-28	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH	GRAH	EP
1997-07-23	Despatch of communication of intention to grantORIGINAL CODE: EPIDOS AGRAGRAG	GRAG	EP
1995-05-10	First examination report despatched17Q	17Q	EP
1993-04-28	Request for examination filed17P	17P	EP
1993-01-27	Designated contracting statesAK	AK	EP
1992-12-04	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL	EP
1991-09-25	Designated contracting statesAK	AK	EP
1991-08-09	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI	EP

Synchronization circuit for atm cells

Abstract

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Priority claims4

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