The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 1983
Filed:
Aug. 11, 1981
Jesse B Lipcon, Harvard, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A tester for the collision detector of a transceiver for a multiple access data communications network using carrier-sense collision detection for controlling access to the network. A squelch circuit is employed in the transceiver's transmitter for enabling and disabling the transmitter output. An end-of-transmission detector monitors the squelch circuit to detect the termination of a transmission. Upon termination of a transmission, a collision simulator circuit supplies to the transceiver's receiver a signal of predetermined amplitude and duration, to simulate the input the receiver gets when a collision actually occurs. If the receiver is working properly, it signals a collision to the host (i.e., computer, terminal, etc). If it does not receive the collision signal at the appointed time, the host knows that either the transceiver's collision detection circuit or the tester is not working.