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Troubleshooting Fiber Optic Audio Cables | DoItYourself.com
https://www.doityourself.com/stry/troubleshooting-fiber-optic-audio-cables#:~:text=A%20good%20way%20to%20check%20whether%20your%20audio,and%20you%20need%20to%20check%20your%20equipment%E2%80%99s%20settings.
Testing Optical Audio Cables........... | Home Theater Forum
https://www.hometheaterforum.com/community/threads/testing-optical-audio-cables.275916/
As for testing - I'm not sure how you'd go about doing that apart from using the "bad" cable to connect another component and see if the problem follows it. (Or letting a friend test it on his system.) Also not really sure it is worth it. You seem to have fixed the problem and optical cables are cheap if you know where to shop.
How to tell if toslink optical audio cable is bad? | AVS Forum
https://www.avsforum.com/threads/how-to-tell-if-toslink-optical-audio-cable-is-bad.1218091/
The first test for Toslink is to pull the receiving end out of the AVR and see if there is a bright red light coming out of the end. Shine it on your hand and look for a brilliant red dot. If you have one and the ends are reasonably tightly held by the sockets at each end then it …
Audio Cable Testing
https://www.nti-audio.com/Portals/0/data/en/NTi-Audio-AppNote-MR-PRO-for-Cable-Testing.pdf
• Connect one cable end to the MR-PRO output connector and the other end to the MR-PRO cable test input or alternatively utilize the NTi Audio Cable Test Adapter for permanently in-stalled cables. • Select the MR-PRO measurement function “CABLETEST”. The displayed test result shall be “OK” (= all pins are connected to the same pin at the other end).
Steps to Testing a Fiber Optic Cables for Optical Loss
https://www.cableorganizer.com/learning-center/how-to/how-to-test-fiber-optic-optical-loss.htm
Connect the test cable to the reference cable. STEP 2. Connect the test source to the transmitting end of the test cable. STEP 3. Connect the power meter to the receiving end of the reference cable. STEP 4. Using the test source, send a light signal into the test cable. STEP 5. At the receiving end of the reference cable, take a reading of the light signal with the power meter
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