Using CAT5 cable to run video and data signals is easy to do and produces excellent results over considerable distances.
Whereas co-ax cables are classed as an unbalanced mode of transmission, CAT5 twisted pair is known as a balanced mode. In this balanced mode, the two cores carrying the video signal are balanced to a particular reference point and the cable twists enable a uniform rejection of the interference, effectively cancelling it out. To produce a balanced signal BALUNs are used, standing for Balanced to Unbalanced.
The CON817 is a popular passive type balun that requires no power to operate and can work up to distances of about 500M although if you are using baluns to send video signals back to multiplexers, quads and DVR it is recommended not to use passive baluns over 200mtrs.
This balun is capable of sending 4 video signals down a single CAT5 cable. It uses standard BNC sockets for video with an RJ45 socket for the CAT5 connection. A second CON817 balun is then used at the DVR/quad end of the cable run to convert the single RJ45 cable into four BNC outputs. |
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