LC fiber optical cable LED USB tester
thingiverse
I wanted to make really easy tester for checking if LC (both UPC and APC) optical cables are OK or damaged during installation and also for recognizing them in network rack, so i designed this tester. It is printed without supports standing on USB hole. Inside is male USB A connector (you can use older from damaged cable or a new one), blinking 5mm LED (yellow, 3.5V, 20mA) and 75ohm resistor. Wires and resistor are inside shrinking tubes to prevent shorts. The USB connector is glued inside with E8000 glue from Aliexpress. Takes about 10 minutes to complete if you know how to solder. Usage is really easy - click in LC connector and power it with powerbank or with smartphone by OTG and you will see blinking on the other end of the cable if everything is OK.
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