Comes with LXI-compliant built-in Ethernet connectivity. Uses distribution boards for easy wiring. Outputs switch read back capabilities and external power option for simultaneous switching. Get the latest woftware drivers for common programming environments. The Keysight L4445A microwave switch / attenuator driver provides digital outputs to control switches, attenuators, and other devices. Use the outputs to drive LEDs that indicate the switch position and read back the switch or attenuator's actual position. The L4445A microwave switch / attenuator driver provides power and control signals for many popular microwave switches and attenuators. One L4445A microwave switch / attenuator driver with accessories can drive up to 64 switch coils (32 SPDT) switches.