patency (plural patencies). ( 1 medicine) The degree of openness of a tube, such as a blood vessel or catheter; the relative absence of blockage. ( 2 uncountable) Obviousness; clarity.
Maximum Length: 16' with a standard cable, Up to 50' with a high quality cable. VGA is an analog signal and so as distance increases the quality will decrease. A lot of factors can determine the maximum cable length, but for low resolutions (up to 800x600) you can reach 100 feet and beyond without too much trouble. For mid-range resolutions of 1280x1024/1024x768 you can typically reach somewhere between 50 to 100 feet.
The attenuation value is expressed in dB/km (decibel per kilometer). It is a function of the wavelength (Î»), i.e. of the color (frequency) of the light. That means that the operating wavelength to transmit a. signal in an optical fiber is not any wavelength.It corresponds to a minimum of attenuation. The following graph gives the linear attenuation as a function of the wavelength: linear attenuation (dB/km) The operating wavelengths, which light sources have been.