These Chassis controls up to 16 8x1 modules, 32 4x1 modules or mixtures of 8x1"s, 4x1"s, 2x1"s and 2x2 modules in any combination or configuration for up to 128 relay drives. LEDs on the front panel show switch and power status. Add Switch Modules, display / driver modules and a Control Module to complete the system or simply buy the chassis wired out to D connectors to control your own relays. A manual control is optional. Chassis is available with sink or source relay drivers from + 5 to + 28 volts, ot TTL drivers for programmable attenuators. Firmware commands for Fade and Handover for WiFi, Cell Phone and WiMax labs. Fully custom systems built with little to no NRE.