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Appendices
HDMI Q & A
What is the difference between a “Standard” HDMI
cable and a “High-Speed” HDMI cable?
Recently, HDMI Licensing, LLC announced that cables would be
tested as Standard or High-Speed cables.
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Standard (or “category 1”) HDMI cables have been tested to
perform at speeds of 75Mhz or up to 2.25Gbps, which is the
equivalent of a 720p/1080i signal.
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High Speed (or “category 2”) HDMI cables have been tested
to perform at speeds of 340Mhz or up to 10.2Gbps, which
is the highest bandwidth currently available over an HDMI
cable and can successfully handle 1080p signals including
those at increased color depths and/or increased refresh
rates from the Source. High-Speed cables are also able to
accommodate higher resolution displays, such as WQXGA
cinema monitors (resolution of 2560 x 1600).
How do I run HDMI cables longer than 10 meters?
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There are many HDMI Adopters working on HDMI solutions
that extend a cable’s effective distance from the typical
10 meter range to much longer lengths. These companies
manufacture a variety of solutions that include active cables
(active electronics built into cables that boost and extend the
cable’s signal), repeaters, amplifiers as well as CAT5/6 and
fiber solutions.
How can I tell if a cable is an HDMI certified cable?
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All HDMI products are required to be certified by the
manufacturer as part of the HDMI Compliance Test
Specification. However, there may be instances where cables
bearing the HDMI logo are available but have not been
properly tested. HDMI Licensing, LLC actively investigates
these instances to ensure that the HDMI trademark is
properly used in the market. We recommend that consumers
buy their cables from a reputable source and a company that
is trusted.
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