The one reason the HDMI cable is unique is because it looks the
same even though it has changed since it first appeared. From the first HDMI
cable to the ones now being offered, the plug on either side goes into an input
or output in just one way, holding in place through friction. The cable itself
looks similar too, although different manufacturers will improve on the outer
casing to make it more durable or distinctive.
So does this mean that you can just attach any HDMI cable to your
various devices to the TV? No! But to understand which to use requires
understanding what an HDMI cable can do.

HDMI cables are listed under different specification numbers — these
basically say what the HDMI cable can and cannot do. But it’s just easier to go by names, which
are:
Standard speed: These are good for video up to 1080i resolution
(and obviously fine for 720p rez too).
Some cable companies and satellite receiver providers were known to give
these out for free back when HDMI cables were hideously expensive, so there might
be a few of these around the house that are now being incorrectly pressed into
duty for 1080p use.
Standard speed with Ethernet: These cables add a dedicated data
channel for device networking and so eliminate a separate Ethernet cable and
require both video source and video display devices to be compatible.
High speed: These HDMI cables are good for video up to 1080p
resolution and beyond. Or in other words, good for any video source device or
TV that is of Full HD resolution as well as 4K resolution. These cables can
also handle transmitting 3D and Deep Color technologies.
High speed with Ethernet: Similar to High speed
cables but adds the dedicated data channel.
[There’s also an automative HDMI cable — that’s
for use in a car, obviously, and is similar in resolution to a standard speed
cable but is more rigorously tested to ensure a stable signal].
So for practical purposes, one should disconnect any HDMI cable
that one can’t verify its type — stop using it to state it simply and
get a High speed HDMI cable or High speed with Ethernet (which is
backwardly compatible with High speed anyway) so that the full resolution and
technologies built into the video source devices and TVs can be utilized. How to know what kind of HDMI cable it is is
easy: just read what the manufacturer puts on the packaging because it’s
all stated right there. Then consider what refinements the maker has added
which might appeal to your particular needs — for
example, how long the cable is, or what its construction is made of or how much
bandwidth the cable can transmit (a high number is always good). Then take them
home and make them do their job. Your eyes will thank you for doing this with
every time you watch something at home.
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