公开(公告)号：DE2304266A1

公开(公告)日：1973-11-15

申请号：DE2304266

申请日：1973-01-30

Applicant: IBM

Inventor： DIXON ROY CONRAD ,  HASH LARRY JOSEPH ,  MARKOV JAMES DONOVAN ,  WEST LYNN PARKER

IPC: G06F13/00 ,  G06F13/372 ,  G06F13/38 ,  H04L12/423 ,  G06F3/04

Abstract: Bidirectionally communicating terminals are connected to a serial loop by interfaces which provide no delay. Communications are effected in fixed length time slots which include an indicia of the state of the slot. Slots carrying data to a terminal have the state indicia set to value which indicates that the slot is in use. At the receiving terminal, the indicia is retained in the state if the terminal is to use the slot for transmitting data. If the receiving terminal has no data to send, the state indicia is reset to a different value. In the reset state, the slot is available to subsequent terminals for the transmission of data.

公开(公告)号：DE2345417A1

公开(公告)日：1974-04-11

申请号：DE2345417

申请日：1973-09-08

Applicant: IBM

Inventor： DIXON ROY CONRAD ,  HASH LARRY JOSEPH ,  MARKOV JAMES DONOVAN

IPC: G06F13/00 ,  H04L12/423 ,  H04L11/06

公开(公告)号：DE2301727A1

公开(公告)日：1973-08-23

申请号：DE2301727

申请日：1973-01-13

Applicant: IBM

Inventor： BOUDREAU PAUL EMIL ,  DIXON ROY CONRAD ,  DONNAN ROBERT ANDERSON ,  MOSS EUAL AARON

IPC: H04L5/22 ,  G06F13/00 ,  G06F13/42 ,  H04L12/433 ,  G06F3/04

Abstract: A serial loop data communications system having store and forward capability at each terminal interface on the loop and in which data signal entities, each of which includes a plurality of data bits, addressed to subsequent terminals on the loop are stored in successive locations in a serial storage device when received if a terminal associated with the interface is transmitting. At the termination of data transmission by the associated terminal, the previously stored data signal entities are forwarded from the data entity storage position occupied by the oldest received entity and subsequently received entities are advanced to successive entity storage positions until data signal entities for subsequent terminals on the loop are no longer received, at which time advancement of the data signal entities is terminated and the data signal entities then remaining in storage, are forwarded from the successive entity storage locations in the serial storage in the order of receipt.