Apple TV to Receiver via OPTICAL AUDIO

I am trying to hook up apple TV. I reand the HDMI to a splitter and I have picture. I need to run audio to my Onkyo txsr501 receiver via the optical cable. I have tried 2 different cables and can not get audio.
any suggestions,
is there something in settings to use optical audio?

You would use optical when connecting to a DVI device for video or when not using the HDMI port at all. The latter is how I've always used my ATV, as an audio-only Airplay bridge that allows my bedroom stereo to stream from my iPod Touch and iTunes on my PC.
Interesting tidbit: It is possible to output audio over DVI, such that a DVI(device)->HDMI(TV, receiver, etc) cable or a plain HDMI cable attached to the device with a DVI/HDMI adapter carries audio, and the target HDMI device won't know the difference between this DVI->HDMI connection and a normal HDMI->HDMI connection. Many PC video cards can do this. This is possible because it's a straight-through connection using exactly the same wires. Most devices won't transmit or receive audio over DVI, and that's why DVI is mainly known as the video-only connection that is compatible with HDMI.

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    Satish : Chat ID for this session is 02241227755. (19:22:31)
    Satish(19:22:37): Thank you for contacting Verizon FIOS technical chat support. My name is Satish , we appreciate your patience in reaching us.
    Satish(19:22:47): May I confirm your telephone number as ----------- . At the end of this chat session I will be sending you some basic troubleshooting steps for future reference to your e mail ID <<<>>>by which you can go ahead and troubleshoot minor telephone, video and internet issues yourself.
    Carol(19:25:38): correct
    Satish(19:25:54): Thank you.
    Satish(19:25:59): For your account security and to assist you better, please confirm the below mentioned details 

1) Name on the account: 
2) Complete address: 
3) A good Callback number for future reference
    Carol(19:29:01): 
    Satish(19:30:01): Perfect! Thank you for providing the account information.
    Satish(19:30:37): I understand that you are unable to connect the audio source S3D630. AM I correct?
    Carol(19:31:22): I have the optical audio cable from stb to soundbar. No sound.
    Satish(19:31:57): Let me try my best to help you get this fixed.
    Satish(19:32:03): Just to let you know, in case the chat gets disconnected due to any issue at either end, please re-initiate the chat through the same channel or call our FIOS phone support at 800-837-4966, whichever is convenient to you.
    Satish(19:32:39): I apologize as the port on the set top box would be disabled by default and our concerned team are working on this to add new feature to set top box. In the mean while the ports are disabled.
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    Satish(19:36:42): I apologize and let me go ahead and conference the chat with my supervisor.
    Inviting John to conference (19:37:03)
    Agent John has joined. (19:37:03)
    Satish(19:37:03): Hello John.
    John(19:37:08): Thank you for contacting Verizon FIOS Chat support Supervisor Queue. One moment while I go through the previous transcript.
    Satish(19:37:34): customer says that he want to connect optical audio cable from stb to soundbar. please help
    John(19:37:59): Okay, I will check with our customer. 

Please drop off the chat.
    Satish(19:38:15): Thank you.
    John(19:38:36): Hello Ms. Rogers.
    Carol(19:38:45): hi
    Satish has left the conversation. (19:38:45)
    John(19:40:11): Ms. Rogers, may I know were you able to access the optical audio port earlier?
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    Carol(19:46:12): again, why?
    Carol(19:46:22): can it be enabled?
    John(19:46:52): Unfortunately, we do not have the option to enable them.
    Carol(19:47:18): and why wouldn't you tell your customers that this port is disabled BEFORE one purchases a home theater or soundbar.
    Carol(19:47:46): that's crazy - you can't enable. AGAIN, WHY?
    Carol(19:48:24): I understand from days of research that COMCAST does not have this problem.
    Carol(19:48:35): Really - this is how you serve your customers?
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    John(19:49:26): However, on the QI{ 7232 box we have the e Sata port only for outward option.
    John(19:49:31): *QIP
    Carol(19:49:56): what does that mean/
    John(19:51:41): We can use the E-Sata drive with the 7232 box to save recordings.
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    Carol(19:53:42): Why would Verizon want to limit its customers' ability to enhance the user experience and benefit from technology?
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