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Media converters are used for converting from media (coax, fiber ,twisted pair )form to another with in the same network . They are usually required where there will be a limitation of length (etc Twisted pair ) or an up-gradation CCTV systems (traditional coax type to IP ) .
for long distance communication and to avoid drop of signal and V-LOSS we cannot install the UTP cable more than 100 metres so we have to used media converter from fibre to UTP
In order to transfer the image to the peripherals far from the place of registration system
As you know signal drop in UTP Cabling max in 100 so we use these device to eexpand the distance of signal by using Optical Fiber Cables
the maximum range for transfer data via UTP or STP cables is about 90 M so, the MEDEA CONVERTER change the data form from IP packet into another form of data like light pulses & then transfer via fiber optics which can transfer these data to many of kilometers without loss or change it to any other communication media depending on data rate & type of application . in brief words we say these device used for span the network .
Media Converter is used to transfere between fiber obtic and UTP cables,unlike decoders is used to convert analog video to digital Video
Media convertors are used to convert the Video output from one type to other like HDMI to VGA. Media converters like to RJ45
Traditional is Coaxial. Now if you want to integrate into digital you will be needing a converter. But now a days, some VMS doesn't require as such conversion as far as your DVR has ethernets port, VMS can combine two kinds of signals in one screen. In adjusting the length of cable, analog system has its own amplification not unless otherwise needed it run by kilos. Unlike rj45 as you've said, it can only maximize to 100 to 120 meter per camera, again it can also extend up to 300 meters if you will add a good switch.
Media convertors are used to convert the Video output from one type to other like HDMI to VGA. Media converters like to RJ45 to Co-axial are also used in some cases to make the IP camera work with Co-Axial cable.
to convert analogue signals from cctv to digital signal in the form of optical nature via media converter,by using media converter we can extend the length of transmission medium or cable.
not all cctv is using media converter.
if the cctv has the speed or has the video and camera media converter must be there.