Method and circuit arrangement for the transmission of data sign

Details Method and circuit arrangement for the transmission of data sign Method and circuit arrangement for the transmission of data sign

1986-08-27

1987-10-13

Schreyer, Stafford D.

Telegraphy

Systems

Simplex-reversing periodic

178 2D, H04L 1116, H04L 2502

Patent

active

047000198

ABSTRACT:
A data transmission system having a number of control devices connected by at least one clock-control transmission loop operated directionally dependent insures that a data signal intended for a group of control devices in the system is actually received by all of the intended control devices. The control device emitting the signal adds an entry preceding the data portion of the signal which identifies all receivers in the group and which also includes a block start identifier, and also adds a last entry to the data portion of the signal which is the address of the sending control device and a block end identifier. Each control device in the group, upon receiving the signal, copies the signal for possible processing, cancels the block end identifier in the last entry of the received signal, and adds a new last entry which is the address of the receiving control device, and acknowledgement of receipt of the signal, and a new block end identifier corresponding to the cancelled block end identifier. The signal is than re-emitted to the loop for transmission to the next control device. After the signal has been transmitted around the entire loop, it returns to the original sending control device which interprets the acknowledgement signals and corresponding addresses in the successively added last entries to determine whether all of the intended control devices in the group actually receive the signal.

REFERENCES:
patent: 4049906 (1977-09-01), Hafner et al.
patent: 4410889 (1983-10-01), Bryant et al.
"Illinet-A 32 MBits/Sec. Local-Area Network," Cheng et al., AFIPS Conference Proceedings 1981 National Computer Conference, May 4-7, 1981, pp. 209-214.

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