Saturday, June 12, 2010
Computer Data Cable Tester
In operation, IC3's outputs drive the indicator LEDs and inverters IC2c-IC2f. Note that there are four indicator LEDs for each pair. LEDs A & C connect to the local end of the cable, while LEDs B & D connect to the remote end. The inverted outputs provide the return paths for the relevant "mate" of each tested pair. As a result, if the cable is OK, LEDs A, B & C will all light for each tested pair. The "D" LEDs at the remote end indicate if there is a crossover in the cable, while the "C" LEDs indicate which pair is being tested. As well, two extra LEDs are connected in series with the GND lead (one at either end) to indicate its status. These LEDs are driven by the O3 output of IC3 via 470W resistors. Finally, note that the LEDs must be high-brightness types.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.