| 摘要 |
PCT No. PCT/SE80/00140 Sec. 371 Date Jan. 15, 1981 Sec. 102(e) Date Jan. 7, 1981 PCT Filed May 14, 1980 PCT Pub. No. WO80/02611 PCT Pub. Date Nov. 27, 1980.Arrangement in data transmission between a transmitting computer, sending signal words containing start-stop information, message words and address-control signal information, and a receiving computer, for providing separate supervision of faults on the transmission lines and of such errors which are caused by faults in the signal equipment pertaining to the computer of the transmitter side, intermediate stations or the computer on the receiver side. The arrangement includes means for generating and checking two check sums which are mutually supplementary, an inner check sum (S) for monitoring the hardware incorporated in computers and intermediate stations on a transmission path, and an outer check sum (YS) for monitoring the transmission lines. The inner check sum is formed by adding all the message words in a complete signal word; and the outer check sum is formed by adding the address-control signal information, message words and the inner check sum. |
