HDR Capabilities and handling of HDBT Extenders

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This topic contains 1 reply, has 2 voices, and was last updated by  Daniel Shwartzberg 2 years, 7 months ago.

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    I am here for sure asking one of the most important Topic of today:

    When using Copper 10,2 GBPS seems to be the Limit.

    But how does a Extenderset without ICT or other Compression Technology handle

    a 60Hz UHD HDR Signal with 10 or 12Bit.

    Is it gonna downgrade to 8 bit? Ot what will happen?


    The next question that I also emailed twice without reply:

    There is a Company named A-Neuvideo listed in your manufacuter list – but without

    any products listed.

    In Contrary the Manufacturer Claims to have severall HDBT certified Extender-Sets on sale…

    So – are these Sets really HDBT certified?

    The Manufacturer Claims that These sets are Capable of passing through 18 GBPS signals.

    It was impossible for me to find out wether this happens by downgrading to 8bit or by using compression Technology.


    Would appreciate Feedback.


    Daniel Shwartzberg
    HDBaseT Alliance

    Hi Martin,

    Thanks for getting in touch.

    Current HDBaseT versions support 8Gbps link speeds, which is the equivalent of a 10.2G HDMI bandwidth (since we code our data differently). What this means is that we can support 4K/30/4:4:4 or 4K/60/4:2:0 without compression, equating to a video clock speed of 297Mhz. In order to support any video formats above that speed (e.g. 4K/60/4:4:4 or HDR10) some form of “manipulation” of the video is required. The HDBaseT Alliance is only certifying products supporting visually-lossless DSC compression, which is a line-based compression scheme that employs a maximum 3:1 compression ratio. There are, of course, other ways to prevent the HDBaseT link bandwidth being exceeded, such as color space conversion (that, for example, converts 4:4:4 to 4:2:0) or other compression schemes. But, again, any product claiming to support video formats above 297MHz will be only be certified by the Alliance FOR THOSE FORMATS if using DSC compression (if using another compression scheme, they can still be certified for 4K/30/4:4:4 or 4K/60/4:2:0).

    Regarding products from the specific company you mention, I will start by saying that the certified products list is full and only lists products that have passed testing in the HDBaseT test facility. The company that you list is a new member of the HDBaseT Alliance, and we would expect their products to be certified shortly. Another possible explanation is that some companies use a contract manufacturer for their products, and that CM is an Alliance member that sent the product for testing (although even in that case the company selling the product must still send it for testing). And one final point is that even if the product is certified, it is the vendor’s responsibility to upload it to the certified products list, and on occasion this does not always happen immediately. Bottom line – checking the certified products list is the correct way to go in order to make sure that you select only products that have passed our testing.

    Hope this helps.


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