Signal transmission system in a bus-type network

Details Signal transmission system in a bus-type network Signal transmission system in a bus-type network

1986-01-06

1988-01-12

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

370 60, 3408255, H04J 302, H04Q 1104

Patent

active

047196203

ABSTRACT:
A signal transmission system which constantly allows data with the top priority to pass preceding others in a bus-type network. In transmitting a packet consisting of a plurality of start-synchronized frames, the bus is monitored for a predetermined period after the first frame transmission. If a frame-start signal is detected during this predetermined period, the next frame is promptly transmitted synchronously with the detected frame-start signal. If no frame-start signal is detected during this period, the next frame is transmitted immediately after the predetermined period elapses. As a result, each frame by a transmitting terminal starts at the same time as that by another terminal. Therefore, so long as the clock pulse error between the different terminals is small enough to permit a frame transmission, the terminals can detect collision for each frame. As soon as either of the terminals detects collision, it stops data transmission, whereby a packet with the top priority is always permitted to pass.

REFERENCES:
patent: 4481626 (1984-11-01), Boggs et al.
patent: 4516239 (1985-05-01), Maxemchuk
patent: 4539677 (1985-09-01), Lo
patent: 4584679 (1986-04-01), Livingston et al.
patent: 4594705 (1986-06-01), Yahata et al.

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