US4776041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collision detection in a fiber optic local area network
Assignee: Mitre Corp
•
Filing: 1986-12-04
•
Granted: 1988-10-04
•
Expires: 2006-12-04
Abstract
Abstract The fiber optic local area network includes an active star node including a plurality of optical receivers and transmitters. A logic element is interconnected with the output of each of the receivers in the node to detect simultaneous transmissions on the network. When simultaneous transmissions are detected, a collision signal is generated and this signal is transmitted by the node transmitters onto the network.
Inventors
- 👤 Charles R. Husbands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:00
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
Collision detection apparatus in a local network connecting multiple terminals via multiple lines comprising an active star node including a plurality of optical receivers and transmitters that communicate with said terminals over said multiple lines and also including a transmitter and receiver pair that form an expansion port for connection of one star node to other nodes in a branching architecture, characterized by one star node acting in a head end mode to rebroadcast all traffic on the network and other star nodes acting in a repeater mode, logic means interconnected with the output of each of the receivers to detect simultaneous transmission on the network; and means for generating a collision signal when the logic means detects simultaneous transmission, the collision signal being transmitted by the transmitters onto the network.
Claim 2
Dependent Claim
131 words
Collision detection apparatus in a local network connecting multiple terminals via multiple lines comprising an active star node including a plurality of optical receivers and transmitters that communicate with said terminals over said multiple lines and also including a transmitter and receiver pair that form an expansion port for connection of one star node to other nodes in a branching architecture, characterized by one star node acting in a head end mode to rebroadcast all traffic on the network and other star nodes acting in a repeater mode, logic means interconnected with the output of each of the receivers to detect simultaneous transmission on the network; and means for generating a collision signal when the logic means detects simultaneous transmission, the collision signal being transmitted by the transmitters onto the network.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 wherein the collision signal has a 10 MHz frequency.
Claim 4
Dependent Claim
40 words
The apparatus of claim 1 wherein the active star node further includes a summation logic element for receiving signals from the plurality of optical receivers and for generating a combined signal, the collision signal being added to the combined signal.
References Cited (Backward Citations)
US4531238A
Cited
US4644587A
Cited
US4472712A
Cited
US4646361A
Cited
US4580872A
Cited
US4628501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |