The 4U Chassis can accommodate a combination of up to 18 pieces 2/4 channels video modules or 9 pieces 8 channels video modules. The chassis employs a 170~260 or 85~130 VAC Switch Mode Power Supply(SMPS) design, which reduces the possibility of a single module failure causing a shutdown or a major failure of other modules within the chassis. The high reliability and stability ensures that if one module shuts down, the operation of the other modules remains unimpaired. 0ne or two air-cooling fans are installed inside to further strengthen the superior performance of the system and eliminate the necessity for periodic maintenance. Status information can be read through the LED indicators on the installed modules. All of the modules installed in the chassis are hot swappable, which makes it unnecessary to power-down the chassis when replacing modules.