G - Physics – 06 – F
Patent
G - Physics
06
F
354/223, 340/73
G06F 11/00 (2006.01) G06F 11/08 (2006.01) H04L 1/00 (2006.01)
Patent
CA 1150843
ABSTRACT OF THE DISCLOSURE 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 comprises 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. A check sum generating circuit is associated with the transmitting computer, and contains an adding circuit and a register which, by adding all the message words in a complete signal word, generates the inner check sum (S). An outer check sum generating circuit generates the outer check sum (YS) by adding the address control signal information, message words and the inner check sum. The correctness of the respective signal sum is checked in possible intermediate stations by reestablishing the sums in adding circuits and by comparison in comparator circuits between the respective reestablished sum and the corresponding check sum coming from the line. In the intermediate station there is furthermore generated, with the aid of an adder and a register, a new outer check sum on the basis of changed address-control signal information. The correctness of the respective check sum is also checked in the receiving computer by reestablishing the sums in adding circuits and by comparison in comparator circuits between the respective reestablished sum and the corresponding check sum coming from the line. In every terminal where the sums are checked and compared there is the possibility of trans- mitting control signals in response to the comparison results, which signals initiate retransmission of the message or switching to another line.
351909
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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