Shorted-coaxial-cable detector for local-area networks

Details Shorted-coaxial-cable detector for local-area networks Shorted-coaxial-cable detector for local-area networks

1987-06-25

1990-06-05

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825160, 324509, H04Q 100

Patent

active

049317911

ABSTRACT:
A local-area-network device (10) includes a pulse detector (40), which detects positive-voltage pulses on the coaxial cable (14) of the local-area network. Such pulses occur when normal transmission signals reach a short circuit and are reflected. Upon detecting a positive pulse, the pulse detector (40) turns off a transistor switch (Q12) so as to remove power from the receive lines (22) of a receiver (20) in the device (10). Control circuitry (18) can thus conclude, from the simultaneous absences of a receive indication and of a collision indication, that a short circuit has occurred on the line.

REFERENCES:
patent: 4038494 (1977-07-01), Miller et al.
patent: 4084070 (1978-04-01), Reed et al.
patent: 4335412 (1982-06-01), Aschwanden
patent: 4647912 (1987-03-01), Bates et al.
patent: 4656471 (1987-04-01), Hanss et al.
patent: 4685113 (1987-08-01), Hono et al.
patent: 4739276 (1988-04-01), Graube
patent: 4752698 (1988-06-01), Furuyama et al.
patent: 4766386 (1988-08-01), Oliver et al.
patent: 4782300 (1988-11-01), Bonaccio et al.

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