H - Electricity – 02 – H
Patent
H - Electricity
02
H
340/73
H02H 3/08 (2006.01) G01R 31/02 (2006.01) H04L 12/26 (2006.01) H04Q 1/00 (2006.01)
Patent
CA 1299698
ABSTRACT OF THE DISCLOSURE 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.
570390
Digital Equipment Corporation
Mallard William C. Jr.
Smart & Biggar
LandOfFree
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