[특허]Broadband ring communication system and access control method

Broadband ring communication system and access control method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-003/00
출원번호	US-0696426 (1991-05-06)
우선권정보	EP-0810456 (1990-06-21)
발명자 / 주소	Mueller Johann R. (Langnau a. Albis CHX) Moehlen Wolfgang C. (Langnau a. Albis CHX)
출원인 / 주소	International Business Machines Corporation (Armonk NY 02)
인용정보	피인용 횟수 : 31 인용 특허 : 0

초록 ▼

For a ring communication system, an access mechanism is provided and supported by medium access control means so that different kinds of traffic are optimally accommodated. Signaling information (SG) and isochronous data (IS) keep their position in a synchronous time raster while propagating on the ring, whereas variable-length data frames (DF A, DF B, DF C, DF D) can be relatively shifted in their position during propagation on the ring, to allow for the insertion of additional variable-length data frames (DF E, DF F), thus giving to all stations attached to the ring a fair chance for transmitting such data frames (DF). The data frames are partitioned into slot-size segments, and the mechanism guarantees that the segments of any data frame will not be interrupted by segments of another such data frame.

대표청구항 ▼

Ring communication system for the transfer of information between a plurality of stations connected to a ring transmission medium; signals being transferred on said ring transmission medium in a fixed time raster comprising time slots; each said station comprising transmit buffer means for holding a frame of local data to be transmitted, and delay buffer means for storing the contents of time slots which were received on said ring transmission medium and are to be retransmitted thereon; each of said time slots carrying an indication whether it is free or busy; and each of said time slots further carrying an indication whether it is a normal time slot or a special time slot; said system further comprising in each station: first transfer means (75) for transferring the contents of each special time slot (SG, IS) received at the input (61, 69, 70) of said station, through a direct path to the output of the station for further transmission on the ring; second transfer means (83, 84) for transferring data either from said transmit buffer means (85A, 85B) or from said delay buffer means (81) to the output (63, 71, 72) of said station for transmission in a normal time slot (DA) on said ring when no contents of a special time slot is transferred through said station by said first transfer means; and third transfer means (77) for transferring the contents of a normal time slot (DA) received at the input of said station, into the delay buffer means if the slot carries a busy indication and the contents is not addressed to the respective station.

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Broadband ring communication system and access control method 원문보기

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