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prescient63 · 05-29-2008, 07:20 AM

Wiki on HDMI cable length, and this should pretty much apply to dvi as you are probably going to end up using a dvi => hdmi adapter (assuming no dvi inputs)

The HDMI specification does not define a maximum cable length. As with all cables signal attenuation becomes too high at a certain length. HDMI specifies instead a minimum performance standard and any cable meeting that specification is considered compliant. Different construction quality and materials enables manufacture of cables of different lengths. Higher performance requirements must also be met to support video formats with resolutions and frame rates higher than standard HDTV formats.

Signal attenuation and intersymbol interference caused by the cables can be compensated by using Adaptive Equalization.

HDMI 1.3 defined two categories of cables: Category 1 certified cables which have been tested at 74.5 Mhz (1080i/720p) and Category 2 certified cables which has been tested at 340 MHz (1600p) to reduce the confusion about which cables support which video formats. A cable of about 5 metres (~16 ft) can be manufactured easily and inexpensively to Category 1 specifications using 28 AWG. Higher-quality construction (24 AWG, tighter construction tolerances, etc.) can reach lengths of 12 to 15 metres (~39 to 49 ft). Active cables or extenders that use fiber optic and single or dual Cat-5 or Cat-6 cables instead of standard copper can also be used to extend HDMI to 50 meters for 1080p and 100+ meters for 1080i or less. Long cable lengths can cause instability of HDCP and blinking on the screen due to the weakened DDC signal on which HDCP is based. HDCP handshake signals must be multiplexed with TMDS video signals to be compliant with HDCP requirements for HDMI over single UTP extender. Some HDMI extenders strip off the HDCP encryption to reduce the cost. These kinds of HDMI extenders are illegal to import and use in the countries that adopted the HDCP standard.[22][23] Some companies offer amplifiers, equalizers, and repeaters that can string several standard (non-active) HDMI cables together. Due to accumulation of signal skew and clock jitter, however, the total cable length is limited to around 40 meters and no more than two equalizers and repeaters for 1080p.

05-29-2008, 07:20 AM	#14 (permalink)
prescient63 You can't blame women for what they do wrong in the same way that you can't blame a dog for what it does wrong. Join Date: Jan 2002 Posts: 1,490 -5 Internets	Wiki on HDMI cable length, and this should pretty much apply to dvi as you are probably going to end up using a dvi => hdmi adapter (assuming no dvi inputs) The HDMI specification does not define a maximum cable length. As with all cables signal attenuation becomes too high at a certain length. HDMI specifies instead a minimum performance standard and any cable meeting that specification is considered compliant. Different construction quality and materials enables manufacture of cables of different lengths. Higher performance requirements must also be met to support video formats with resolutions and frame rates higher than standard HDTV formats. Signal attenuation and intersymbol interference caused by the cables can be compensated by using Adaptive Equalization. HDMI 1.3 defined two categories of cables: Category 1 certified cables which have been tested at 74.5 Mhz (1080i/720p) and Category 2 certified cables which has been tested at 340 MHz (1600p) to reduce the confusion about which cables support which video formats. A cable of about 5 metres (~16 ft) can be manufactured easily and inexpensively to Category 1 specifications using 28 AWG. Higher-quality construction (24 AWG, tighter construction tolerances, etc.) can reach lengths of 12 to 15 metres (~39 to 49 ft). Active cables or extenders that use fiber optic and single or dual Cat-5 or Cat-6 cables instead of standard copper can also be used to extend HDMI to 50 meters for 1080p and 100+ meters for 1080i or less. Long cable lengths can cause instability of HDCP and blinking on the screen due to the weakened DDC signal on which HDCP is based. HDCP handshake signals must be multiplexed with TMDS video signals to be compliant with HDCP requirements for HDMI over single UTP extender. Some HDMI extenders strip off the HDCP encryption to reduce the cost. These kinds of HDMI extenders are illegal to import and use in the countries that adopted the HDCP standard.[22][23] Some companies offer amplifiers, equalizers, and repeaters that can string several standard (non-active) HDMI cables together. Due to accumulation of signal skew and clock jitter, however, the total cable length is limited to around 40 meters and no more than two equalizers and repeaters for 1080p. Last edited by prescient63 : 05-29-2008 at 07:22 AM.