Twisted pair - 4 pairs of 'twists'
Twisted is another type of CCTV cable
Twisted pair cable is the best alternative to coaxial cable if the length within the run is more rather than a few hundred meters. With twisted pair, runs of up to 600 meters can be utilized without any in-line repeaters.
Twisted pair transmission one other called balanced video transmission. The cable consists of 4 pairs of 'twists'. Because each pair of wire are twisted for the length of this cable, any electro-magnetic interference affects both wires likewise. Both wires are subjected to drinks as well . interference, that it is addressed as balanced transmission. Unlike coaxial cable, where the shield is grounded and commons the zero potential from the two points, the twisted pair video transmission concept does not common the zero potential between the two points.
If 2 wires have similar characteristics, and enough twists per meter(the more the better!), they will be subjected to related levels of interference and voltage halt. This allows for most unwanted noise to be eliminated at the receiving closing stages.
Video balun - converts twisted pair to coax
In CCTV cameras typically have a BNC connection on the camera. Can't directly connect twisted pair cable to this. Whats needed is a video balun for both the sending and receiving end. Nonetheless got connect a coax cable to the camera, the coax cable then relationships a video balun, which transmits the signal over twisted pair. On the receiving end, another video balun is required to convert the signal to power through a coaxial connection.
Because twisted pair cables generally have 4 pairs per conductor. This actually allows you to carry 4 video signals on the inside one cable. So you can connect to 4 cameras at one location with the run of 1 cable
Fiber optics - CCTV Cable
Fiber optics uses light as a carrier
Fiber optic transmission shows the best quality and is the most secure transmission media. Fiber optics tend to be used in long distance and overseas communications depended. It has mainly been unused in CCTV cameras for fear of the usb ports being a 'touchy' technology and 'too expensive'. Fiber optics have become cheaper and much easier to install, so it's use improve in long term.
Fiber optic transmission uses light to send out data, compared to electric currents. The advantages of fiber are:
intercepting the signal, that will be easily detected
Fiber optics do have some disadvantages around the. Terminating fiber optic cables requires special tools and better precision of workmanship when compared with any other cable. Also switching and routing of fiber optic signals isn't easy. Fiber optic cables are also more fragile, stepping regarding cables could easily damage them.