Although the first HDMI 2.1 48g cable was announced at the end of last year, it has not been officially certified by HDMI forum, because the certification procedure of HDMI 2.1 has not been prepared yet. However, many wire manufacturers are already showing various prototypes, and TV manufacturers are preparing the first ultra-high definition TVs using HDMI 2.1.

HDMI 2.1 48g cable uses four data channels, each working at 12gbps frequency, with a total bandwidth of 48Gbps, which is significantly higher than 18gbps of current HDMI 2.0, but still maintains downward compatibility.

HDMI 2.1 48g cable certification is about to start

The larger bandwidth enables HDMI 2.1 to support higher resolution and refresh rate, including 4kp120, 8kp100 / 120, 10kp100 / 120, larger color space, such as bt.2020 (rec. 2020), and higher color depth, such as 10bit, 12bi or even 16bit.

Because HDMI 2.1 48g cable and signal source are different from current HDMI 1.4 / 2.0, manufacturers need to use new manufacturing methods, and HDMI forum needs to introduce a new set of certification procedures, including many assessment tests, to ensure that the cable can work normally at high speed and support all characteristics. The HDMI forum said that most cable manufacturers have enough experience to manufacture HDMI 2.1 48g products. However, because the HDMI 2.1 48g certification program has not been started, manufacturers cannot sell wires in the name of ultra-high speed HDMI.

The HDMI forum plans to launch the ultra-high speed HDMI certification program in a few months. At that time, we will see the “official” HDMI 48g cable. When the assessment test is ready, TV manufacturers can also mark their products with the mark of HDMI 2.1 compatibility.

In addition to higher resolution, refresh rate and color depth, HDMI 2.1 also provides a number of new features, including variable frame rate (VRR), fast media switching (QMS), fast frame transfer (QFT) and earc. These new features do not require 48g cable if combined with 4kp60 resolution, but if 4kp120 / 4:4:4 is combined with VRR.

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