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[Problem] There are 3 services / modes transported on line 21: - Captioning - TEXT (generally not program related) - XDS (eXtended Data Services) Bytes belonging to the unsupported modes are interleaved with the bytes of the captioning mode. See Chapter 7, Chapter 8.5 and Chapter 8.6 of the CEA608 Standard for more details. [Solution] Drop all bytes belonging to unsupported modes. [Test] - All streams containing only captioning services should not be influenced - Test all 4 CEA 608 channels with live over-the-air content and using all available TEXT and XDS streams.