The High-Definition Multimedia Interface (HDMI) was originally launched in 2002 to replace the aging and bulky SCART connection or RCA cabling. Since then, more than 2 billion HDMI-enabled device have shipped and HDMI technology has extended into an increasingly wide array of devices, applications, and industries, including cell phones, automobiles and commercial applications such digital signage and airport installations. To further expand HDMI's reach and build on its success, the original seven founding companies decided to increase industry participation in the standard by forming the HDMI Forum, a non-profit corporation to further development of HDMI. Since its formation in October 2011, the HDMI Forum now has 88 member companies, clearly establishing HDMI as the most widely accepted interface for uncompressed audio and visual applications. After nearly two years of behind-the-scenes development, the HDMI Forum officially unveiled HDMI 2.0 in September of 2013, the first specification to be developed by the new group. The heir apparent to hdmi cable 1.4v, HDMI 2.0 is an improved standard for AV connectivity with the performance needed for high-end video playback, such as 4K Ultra HD. While HDMI 1.4b has a throughput of 10.2 Gbps, it's only enough to support a 4K resolution of 3840 x 2160 pixels at 24, 25 and 30Hz or to display full 4K (4096 x 2160 pixels) at 24 Hz. The 2160p24 and 2160p30 formats might be good enough for movie playback, but they fall short of the 50/60Hz required for 4K TV broadcasts and future Ultra HD gaming. HDMI 1.4b also only supports 8-bit color at 4K. HDMI 2.0 improves upon this, offering 10 to 12-bit color depth at Ultra HD resolutions. HDMI 2.0 doesn't fully double the throughput of HDMI 1.4b, but it boosts it up to 18 Gbps. This enables a number of important enhancements and features including: • 4K Ultra HD at 50/60Hz • Up to 32 uncompressed digital audio channels (compared to HDMI 1.4's eight) • Up to 1536 kHz audio sampling • Simultaneous delivery of dual video streams to multiple users (on the same screen) • Simultaneous delivery of multi-stream audio to multiple users (up to four) • Support for 21:9 aspect ratios • Dynamic synchronization of video and audio streams • Additional CEC extensions for remote controls Despite the many advantages provided by the new specification, it's important to stress that HDMI 1.4b is far from obsolete. HDMI 2.0 is fully backwards compatible with HDMI 1.4b and uses the same 19-pin connectors. Higher speeds such as 4K at 50/60Hz require a Cat 2 HDMI cable. And to ensure backward compatibility, the HDMI Forum is requiring that HDMI 2.0 products must pass HDMI 1.4b compliance testing. HDMI also has a low-speed hand shaking bus known as EDID plus encryption, a capability that has become popular with service providers and contributed significantly to HDMI's success over the past decade. It also has a consumer electronic control to provide remote control capability using a single digital interconnect. HDMI 1.4 added the bi-directional Ethernet and audio return channel. This architecture carries over to HDMI Cable 2.0 .