Securely connect one end of the optical digital cable to the optical out on your tv.
Fiber optic port on tv.
To ensure that you will be able to transfer digital audio you need to ensure that the source that you are using is sending a digital audio signal to the television.
You can pipe the hdmi video from the source say your cable box into your tv then turn right back around and pipe the optical audio out to your receiver and speaker system.
There is good chance that a premium audio video receiver manufactured anytime in the last decade or two has a toslink port.
Remember toslink has been on the market since 1983.
In all about 100 different types of fiber optic connectors have been introduced to the market.
Better connectors lose very little light due to reflection or misalignment of the fibers.
The optical out port also called spdif or toslink is used to send digital audio from your television to a sound bar or stereo receiver.
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The connectors mechanically couple and align the cores of fibers so light can pass.
Go into the sound or speakers menu of the tv and select external speakers or audio system.
The audio data is converted from digitally encoded electrical pulses to light on the transmission end using an led light bulb.
Try changing the channel on your tv to another digital broadcast.
An optical fiber connector terminates the end of an optical fiber and enables quicker connection and disconnection than splicing.