100% Satisfaction Guarantee
Low Voltage Cable Superstore
Ph: 951.824.1572
Home > Home Theater Equipment > Understanding HDMI

Understanding HDMI

Understanding HDMI Cables

Understanding HDMI Cables

High Definition Multimedia Interface, or HDMI is an interface for transferring uncompressed video data as well as both compressed and uncompressed audio data. Using HDMI, one can transfer audio and video data from an HDMI compliant source device to a compatible digital television, computer monitor, video projector, or digital audio device.

HDMI is backward compatible with single link Digital Visual Interface Digital, or DVI-D, and DVI-I. No signal conversion is required so signal integrity is maintained.

DVI-D is for digital signals, while DVI-I allows both digital and analog signals. Dual link DVI allows high resolution (1920 X 1080) video and more channels. It is also backward compatible with Single Link DVI.

Some advantages of digital HDMI include preserving signal quality, ability to transmit high definition video and audio signals for home theater, and being able to transmit signals over a greater distance. DVI cables are limited to a five meter range. Whether you’re building a home theater or upgrading your entertainment system, CyberXLink has your end-to-end solution. We have a wide selection of HDMI products including: HDMI Cables, DVI / HDMI Cables, HDMI / VGA Splitters, HDMI Wall Plates, and more.

Get the most out of your home theater with CyberXLink’s HDMI products.

If you have any questions, feel free to give us a call. 951-824-1572

1) What is the difference between Dual Link and Single Link? Which do I need?

Dual link enables a higher resolution (1920 X 1080) and more channels. You can view 2 displays simultaniously. If in doubt, order the Dual Link cable because it is backwards compatible with Single Link.


2) I need a DVI-I to DVI-D cable - What part number do I buy?

A DVI-I enables digital and analog signals. A DVI-D only allows digital signals. The part number to buy is DVIDL-length.


3) Why are your DVI cables so much less?

You are coming right to the source. Our cables meet all wiring specifications. We don't know why everybody else is so expensive.


4) Is there a distance limitation?

Yes. For digital DVI cables there is a 5 Meter distance limitation. If you go longer the video results will be unpredictable and not guaranteed.


5) What is the TFT LCD?

TFT stands for "Thin Film Transistor" and describes the control elements that actively control the individual pixels. For this reason, one speaks of so-called "active matrix TFT's". LCD means "Liquid Crystal Display" and stands for monitors that are based on liquid crystals.


6) What's the difference between CRTs size and TFT size?

The visible diagonal size of a CRT tub monitor is always smaller than the tube's actual diagonal size. For example: a 17-inch CRT monitor has an edge area and it's visible diagonal is only 16-inches. But TFT LCD monitors do not have an edge area. This means that a 15-inch TFT LCD monitor is almost the same as the 17-inch CRT monitor.


7) What's the Contrast Ratio?

The Contrast Ratio is derived from the maximum and the minimum values for brightness.


8) What's the difference netween Digital and Analog Interface? Any advantages or disadvantages?

TFT LCD monitors with an analog VGA interface dominate the market. Because it is easy to install PC basis and not purchase a new graphics board. Although digital TFT LCD monitors don't need to adjust clock and phase and the no signal losses advantage. The Digital Interface standard has totally different connectors and it is not easy to buy a suitable graphic board. So the analog TFT LCD monitors still dominate the market. The following table gave you an overview of the most important points:


Digital Control



  • No signal losses due to DA and AD conversion
  • Geometry, clock and phase settings unnecessary - therefore simple to use
  • Lower costs as less electronic circuitry required


  • Currently three standards (P & D (M1DA), DFP, and DVI)
  • Low availability of models with digital interfaces
  • Requires graphic board with digital output


Analog Control



  • Compatible with standard VGA boards on a broad installed PC basis
  • Not necessary to purchase seperate board


  • Clock and phase of the TFTs must be synchronized with the analog signal to avoid pixel jitter, which is a relatively complex issue
  • Cables sensitive to external influences
  • High cost of signal conversion inside the display
  • Upgrade to digital interface not possible