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US4719620A
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US
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Signal transmission system in a bus-type network
Assignee: Sharp Corp
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Filing: 1986-01-06
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Granted: 1988-01-12
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Expires: 2006-01-06
Abstract
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.
Inventors
- 👤 Katsuyuki Machino
- 👤 Masahiro Ise
- 👤 Tsuneyuki Iwano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:58
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40143; H04L12/4015; H04L12/407; H04L12/413; H04L12/4135
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A signal transmission system in a bus-type network for transmitting or receiving a data packet of a plurality of start-synchronized data frames whereby a packet with top priority is constantly allowed to pass through a circuit prior to other packets when a plurality of said packets collide with one another, the signal transmission system comprising: a bus; a plurality of transmitting/receiving terminals for respectively transmitting a packet of a plurality of frames and for monitoring the bus for a predetermined period after outputting a preceding frame; each said transmitting terminal monitoring said bus for said predetermined time after the preceding frame and transmitting a subsequent frame having a frame start signal at the end of said predetermined time, each said transmitting terminal further outputting the next one of said plurality of frames in synchronization with a frame start signal generated by another said transmitting terminal if said frame start signal is detected during said predetermined period; each said transmitting/receiving terminal including predetermined period generating means for counting said predetermined period for each of said plurality of frames.
Claim 2
Dependent Claim
177 words
A signal transmission system in a bus-type network for transmitting or receiving a data packet of a plurality of start-synchronized data frames whereby a packet with top priority is constantly allowed to pass through a circuit prior to other packets when a plurality of said packets collide with one another, the signal transmission system comprising: a bus; a plurality of transmitting/receiving terminals for respectively transmitting a packet of a plurality of frames and for monitoring the bus for a predetermined period after outputting a preceding frame; each said transmitting terminal monitoring said bus for said predetermined time after the preceding frame and transmitting a subsequent frame having a frame start signal at the end of said predetermined time, each said transmitting terminal further outputting the next one of said plurality of frames in synchronization with a frame start signal generated by another said transmitting terminal if said frame start signal is detected during said predetermined period; each said transmitting/receiving terminal including predetermined period generating means for counting said predetermined period for each of said plurality of frames.
Claim 3
Dependent Claim
41 words
The signal transmission system of claim 1, wherein said predetermined period is set to be longer than the difference between a frame duration by a transmitting terminal with the fastest clock pulse and the transmitting terminal with the slowest clock pulse.
Claim 4
Independent Claim
171 words
A method of preventing data errors caused by data collisions on a bus in a network having a plurality of transmitting/receiving terminals for transmitting or receiving a data packet of a plurality of start-synchronized data frames where a data packet having a top priority is transmitted prior to other packets when a collision is detected, said method being performed by each said terminal and comprising: (a) monitoring the bus to detect the presence of a first frame; (b) monitoring the bus for a predetermined period after said first frame is completed to detect whether a frame start signal of a subsequent frame has been generated by another said terminal; (c) transmitting a subsequent frame having a frame start signal at the end of said predetermined period if no frame starg signal is detected by said step (b) of monitoring during said predetermined period; (d) transmitting a subsequent frame having a frame start signal immediately upon detection of a frame start signal during said predetermined period by said step (b) of monitoring.
Claim 5
Independent Claim
171 words
A method of preventing data errors caused by data collisions on a bus in a network having a plurality of transmitting/receiving terminals for transmitting or receiving a data packet of a plurality of start-synchronized data frames where a data packet having a top priority is transmitted prior to other packets when a collision is detected, said method being performed by each said terminal and comprising: (a) monitoring the bus to detect the presence of a first frame; (b) monitoring the bus for a predetermined period after said first frame is completed to detect whether a frame start signal of a subsequent frame has been generated by another said terminal; (c) transmitting a subsequent frame having a frame start signal at the end of said predetermined period if no frame starg signal is detected by said step (b) of monitoring during said predetermined period; (d) transmitting a subsequent frame having a frame start signal immediately upon detection of a frame start signal during said predetermined period by said step (b) of monitoring.
Claim 6
Dependent Claim
39 words
The method of claim 3 wherein each said terminal performs said method which further comprises; said steps (b-d) are repeated with said subsequent frames as said first frame until data transmission of said packet by said terminal is completed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |