Empfangskammer » Protecting Video Signals from EMI

Protecting Your KVM and Video Extenders From Electromagnetic Noise Computers Articles | July 5 Cheap Ultra Boosts , 2010
Protect your KVM or Video Extender from Electromagnetic Interference (EMI) or noise. Use shielded cable to transmit the signal to prevent EMI from interfering with signal transmission.



KVM (keyboard-video-mouse) extenders via CAT5 may be used to remove computers from harsh or sensitive environments, or to restrict physical access to the computer. Video extension products such as VGA, DVI, S-Video or HDTV extenders via CAT5 are used to extend video displays. Each extender consists of two units - the local and remote unit Cheap Adidas Ultra Yeezy Boost , which are interconnected using a CAT55e6 cable.

The low cost and easy installation of twisted pair cables such as, CAT5, CAT5e or CAT6 cable, have made them a popular choice over traditional coax cables for transmitting KVM and AV signals. However Cheap Ultra Yeezy Boost , using a type of twisted pair cable that is unsuitable for your installation environment can lead to erratic keyboard or mouse performance, data loss, and picture quality degradation, effectively undermining the purpose of your workstation or video extension.

One of the causes of signal and video quality loss when using a twisted pair cabling infrastructure is an installation environment with extreme levels of Electromagnetic Interference (or EMI Cheap Adidas Ultra Boost Womens , also called Radio Frequency Interference or RFI).


Electromagnetic Interference


Electromagnetic interference is an unwanted disturbance caused in an electrical circuit by electromagnetic radiation emitted from an external source.

All electronic and electrical devices produce electromagnetic radiation during operation. The current flowing in a circuit generates a magnetic field. The potential difference or voltage necessary for the current to flow, produces an electric field. Strong electrical and magnetic fields can cause one electrical device to affect another. When this is unintentional, it is known as electromagnetic interference, commonly abbreviated as EMI.

Electromagnetic interference can disrupt the normal operation of electronic equipment. Normal levels of EMI such as those generated by computers Cheap Ultra Boost Womens , switches or routers will not affect NTI KVM and video extenders. However, extreme levels of EMI in the environment can interfere with the signal transmission. This can lead to video distortion and image loss. The longer the cable and the less attention paid to cable installation, the more likely is the effect of the EMI.

Some common sources of extreme EMI in a building include air-conditioners, elevator motors Cheap Adidas Ultra Boost Uncaged , generators, radio transmitters and welders. Installing the cables near large power transformers or in close proximity (less than one foot) of fluorescent lights can also cause problems with EMI.


How EMI affects Video Signals


EMI affects both audio and video signals. In audio signals, it obscures low level detail and ambient information. In video signals, the interference distorts the signal and is manifested in different ways.



Noise from sources such as air-conditioners Cheap Ultra Boost Uncaged , elevator motors, generators etc. is manifested as lines of noise or spots. This is caused by the electric and magnetic fields generated in the motor as it is running. The larger the motor, the larger the electric and magnetic fields will be. Rapidly turning the motor on and off can also cause interference.



A torn and distorted image is caused by running the cables in the vicinity of sources of strong magnetic fields such as large power transformers and fluorescent lights. The cables have to be in close proximity (less than 1 foot) of fluorescent lights for interference to occur.



A visible pattern of interference lines is result of interference from sources such as radio transmitters. The radio signal needs to be strong and nearby for it to interfere with the video signal being transmitted on a twisted pair cable.



Protecting Video Signals from EMI


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