New image processing techniques have enabled camera manufacturers to boost the resolution of color cameras up to 540 TV lines (TVL). However, 540 TVL can only reach its full benefit if you use short cables; otherwise, the attenuation in the cable reduces the observed resolution.
To eliminate the need for additional amplifiers to compensate for these cable losses, many Bosch cameras have a cable compensation function that adapts the camera's video output to minimize cable loss. This function boosts high-frequency components in the output signal that are responsible for fine picture details, which compensates for high-frequency loss in the cable. It also compensates for cable resistance by amplifying DC power and lower-frequency components that are responsible for maintaining correct synchronization of bright pictures. You can select cable compensation right in the camera's on-screen display (OSD). It can be set to three types of coaxial cable with equalization levels that are adjustable over a wide range: it can compensate for cable lengths up to 2000m (6000 ft.). Only Bosch cameras with built-in cable compensation are therefore capable of bringing full 540 TVL resolution to the recorders and monitors at the head-end location.
