[특허]Local area network for digital data processing system

Local area network for digital data processing system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-003/02 H04J-003/24
출원번호	US-0412576 (1989-09-25)
발명자 / 주소	Mann Bruce (Mason NH) Duffy Darrell (Windham NH) Lauck Anthony (Wellesley MA) Strecker William (Harvard MA)
출원인 / 주소	Digital Equipment Corporation (Maynard MA 02)
인용정보	피인용 횟수 : 54 인용 특허 : 0

초록 ▼

A local area network for interconnecting terminals and other users and data processing systems and other service providers over a communications link. The users and providers connect to the communications link by means of interface units each of which may connect to several users or providers. The interface units communicate over the communications link by means of messages. When a user requires the use of a service, the interface unit establishes a virtual circuit between it and the interface unit connected to the service provider and a service session which allows the user and the service provider to communicate over the virtual circuit. If several users connected to the one interface unit as the first user require services provided by providers which connected to the same interface unit as the first provider, they communicate in sessions over the same virtual circuits. The session messages are accumulated into single virtual circuit messages that are acknowledged in unison by the receiving interface unit. Each virtual circuit in the users\interface units includes a timer which reset when a message is transmitted over the virtual circuit and a data waiting flag set whenever data is present to be transitted over the virtual circuit. The interface units are inhibited from transmitting over a virtual circuit unless the timer has timed out and the data waiting flag is set.

대표청구항 ▼

A local area network (10) including a server (24) and a node (34) interconnected by a communications link (16), A. said node (34) transmitting node messages each including a data field (140, 162) for containing data to be transferred to said server and a response requested flag field (80) having a set condition and a clear condition; B. said server (24) including: i. timing means (92) for performing a timing operation to assert a timing signal at the end of a predetermined timing interval; ii. data storage means (106) for storing data for transmission to said node; iii. data waiting flag means (86 108), having a set condition and a clear condition; iv. message transmission means (60, 66, 100) for generating server messages for transmission over the communications link (16), each said server message being generated only when said timing signal (92) is asserted and the data waiting flag means (86) is in said set condition, said message transmission means (60, 66, 100) further resetting said timing means (92) and enabling said timing means 92 to begin said timing operation in response to the transmission of each said server message; v. server message receiving means (60, 66, 100) for connection to said communications link 16 for receiving node messages; and vi. first data waiting flag condition establishment means connected (108) to said data storage means for setting said data waiting flag means (86) into said set condition, in response to said data storage means (106) containing data to be transmitted vii. second data waiting flag condition establishment means (60, 62, 66, 80) for setting said data waiting flag means (86) into said set condition, in response to receipt by said server message receiving means of a node message in which said response requested flag field has said set condition, and said timing means (92) and said data waiting flag means (86) together regulate transmission of messages onto said communications link both from said server (24) and from said node (34).

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증

Local area network for digital data processing system 원문보기

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대표청구항 ▼

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연합인증

Local area network for digital data processing system 원문보기

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대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (54)

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