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KVM (keyboard, video and mouse) via CAT5 extenders can be used to delete sensitive computers or from difficult environments, or restrict physical access to your computer. products such as extending VGA, DVI, S-Video or HDTV CAT5 supplements are used to expand the video screens. Each extension consists of two units - local and remote units that are interconnected by CAT5 cable / 5e / 6.

cables with low cost and ease of installation of these twisted pairsthat, CAT5, CAT5e or CAT6 cable, they have become a popular choice over traditional coaxial cables for transmitting signals AV and KVM. However, using a type of twisted pair cable that is not appropriate for your installation environment can lead to keyboard or mouse erratic performance, data loss and degradation of image quality, compromising the purpose of your job or length of the video.

One cause of the video signal and loss of quality when you use a twisted paircabling infrastructure installation environment is one of extreme levels of electromagnetic interference (EMI or RFI also called or RFI).

Electromagnetic Interference

Electromagnetic interference is an undesirable disturbance in an electrical circuit by electromagnetic radiation emitted by an external source.

All electronic and electrical produce electromagnetic radiation during operation. The current flowing in a circuit generates amagnetic field. The potential difference or voltage required for current flow produces an electric field. The strong magnetic and electric fields can cause an electrical device to affect another. Where this is not intentional, is known as the electromagnetic interference, often shortened to EMI.

The electromagnetic interference may disrupt normal operation of electronic equipment. Normal levels of EMI such as those generated by computers, switches or routers without effect on NTIKVM and video extenders. However, the extreme levels of EMI in the environment can interfere with the signal. This can lead to distortion and loss of the video image. More cable and care less attention to the installation of cable, plus the effects of EMI.

Some common sources extreme EMI in a building air-conditioning, engine lift, generators, radio transmitters and welders. Installing the cables near high power transformers orvery close (less than one foot) of fluorescent lighting can also cause EMI problems.

What are the effects of video signals EMI

EMI affects both audio and video. In audio signals, the hidden details of environmental information at the bottom. In video signals, interference distorts the signal and obvious ways.

The sources of noise such as air conditioners, elevator motors, generators etc. lines manifests itself as noise orpoints. This is caused by electric and magnetic fields generated in the engine running. More powerful engine plus electric and magnetic fields. rapid rotation of the engine and out can also cause interference.

A torn and distorted picture is caused by running the cables near sources of strong magnetic field, high power transformers and fluorescent lights. The cables must be very close (less than 1 foot) fluorescent lampsinterference occur.

A visible trend lines of interference is the result of interference from such sources as radio transmitters. The radio signal must be robust and close to interfering with the video signal is transmitted over a twisted pair cable.

EMI protection video signals

A simple and cost effective to prevent EMI to interfere with the transmission of signals is to use a shielded cable to transmit the signal. Cable shielding is providedin a wide range of designs. Each type of shielded cable construction provides several advantages that should be considered carefully when selecting the best and most cost effective option for a given application.

Braid Shields: Shield stranded in a twisted pair cable provides an effective protection in audio and RF ranges. It also provides excellent structural integrity, while maintaining good flexibility. Braid shields are better than aluminum to minimize lowfrequency interference and less DC resistance.

Blade Shields: A shield twisted pair provides excellent protection against electromagnetic interference and radio frequency audio. Weigh and cheaper than braid shields.

Because of their smaller size, coats of aluminum are commonly used to protect individual pairs of multi-pair cables to reduce interference. the son of drain are typically used with protective film to facilitate the completion of the hullconnection at the connector.

Combining Foil / Braid Shields: A pair of twisted cables with a combination blade / braid shield provides maximum efficiency across the spectrum. The role of the association / braid combines the benefits of a coverage of 100 percent aluminum with the strength and low DC resistance of a braid.

How shielding reduces EMI problems

Thinking and absorption are the main means dramatically reducing the EMI shield effectpush the signal conductors in a shielded twisted pair cable. The Shield will also absorb some energy from the radio transmitter EMI, which reduces the amount of EMI that makes internal conductor twisted pair. When properly installed with shielded connectors ground equipment, protection redirects a small amount of energy electromagnetically. These effects of reflection, absorption, and redirection shield very effective in reducing problemshigh frequency interference.

The best way to protect against EMI low frequency magnetic fields as a large motor or transformer, is to provide enough distance between the cable and the source field interference. Cable shielding has limited effectiveness in preventing interference problems low frequency magnetic fields. Instead of a magnetic field to reduce the reflection or absorption, the wire produces a magnetic field in oppositionthe lowest frequency of the interference of the magnetic field. This has the effect of reducing the intensity of the magnetic field variable reaches conductors twisted pair.

Statement

If you have a problem of electromagnetic noise, you should use a shielded cable. In the case of an electromagnetic frequency noise only, from a radio station, a piece of shielded cable provides adequate protection. To ensure effective protection against low frequencieselectromagnetic fields, such as an electric motor, a braid or a combination of aluminum / braid is necessary. If you're not sure what kind of electromagnetic noise, we recommend a combination of aluminum / braided shielded cable, as it offers the best protection against a wide range of electromagnetic noise.

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