Discontinued
![Discontinued](https://staging.lightware.com/pub/media/oander/badge/Discontinued_red.png)
![25G-LAYER-FWD-80](https://staging.lightware.com/pub/media/catalog/product/cache/small_image/240x300/beff4985b56e3afdbeabfc89641a4582/f/o/forward_audio_layer.png)
Forward audio layer
The Forward Audio channel is a second independent S/PDIF audio stream not related to the Embedded Audio. A separate S/PDIF matrix switch manages Stereo PCM, 5.1 Dolby Digital and DTS, and various other formats.
![Discontinued](https://staging.lightware.com/pub/media/oander/badge/Discontinued_red.png)
![25G-LAYER-FWD-160](https://staging.lightware.com/pub/media/catalog/product/cache/small_image/240x300/beff4985b56e3afdbeabfc89641a4582/f/o/forward_audio_layer_1.png)
Forward audio layer
The Forward Audio channel is a second independent S/PDIF audio stream not related to the Embedded Audio. A separate S/PDIF matrix switch manages Stereo PCM, 5.1 Dolby Digital and DTS, and various other formats.
![Discontinued](https://staging.lightware.com/pub/media/oander/badge/Discontinued_red.png)
![25G-LAYER-RET-80](https://staging.lightware.com/pub/media/catalog/product/cache/small_image/240x300/beff4985b56e3afdbeabfc89641a4582/r/e/return_audio_layer.png)
Return audio layer
Return Audio Layer creates the ability to send two different multichannel audio streams, one from source to display and another, a return channel in the opposite direction. Audio Return Channel (ARC) was introduced by the HDMI 1.4.standard. This S/PDIF signal is sent in the opposite direction to the video signals. Usually displays send ARC to source devices ‑ typically TV sound to audio receivers, or microphone sound from headsets to computers.