HDMI ConnectionsHDMI ConnectionsThere are lots of methods you can use to connect home-theater components. For example:Component video carries analog video signals separated into two channels for color and a third for luminance. Since DVI and HDMI both use the oakley TMDS rayban protocol, they're compatible. Both use a grid of pins to transmit signals from the cable to the device. While DVI has a 29-pin connector, HDMI's type A connector has 19 pins. air jordans A DVI connector also uses a pair of built-in screws to anchor it to the device. HDMI plugs don't have this extra support, and some users have expressed concern that this puts unnecessary strain on the device's circuitry. Three audio and video channels travel through two pins each, for a total of six pins. The TMDS clock, which allows devices to synchronize the incoming data, travels through one pair of pins. Each of these four total pairs has a shield -- another wire that protects it from interference from its neighbors. The TMDS channels, the clock and the shields make up the bulk of the cable pairs inside the HDMI cable.The other signals that travel through the HDMI cable need only one pin. One such channel is the consumer electronics channel (CEC). If your devices support it, this channel allows them to send instructions to one another. For example, an HD-DVD player could automatically turn on a home-theater receiver and an HDTV when it sunglasses started playing a disk. The hot plug detect channel, which uses one pin, senses when you plug in or unplug a device, re-initializing the HDMI link if necessary. The one-pin display data about michael kors channel (DDC) carries device information and the HDCP encryption information discussed in the previous section. Category 1 has a speed of 74.25 MHz. Category 2 has a speeded of 340 MHz. These capabilities have changed significantly over several revisions to the standard, which we'll compare in the next section.