WN9401 is a 4-channel independent output optical workstation, designed with a highly modular concept, so that functions can be added according to future needs. The WN6910 responder can be directly inserted into the slot without external wiring. This module can measure and control the tri-state gate switch, optical input selection switch, and electric gain and slope adjustment on the motherboard. It can be operated locally through a laptop or controlled through Teleste's CATVisor network management software. It features redundant dual forward optical reception with AB selection switch, up to 4 redundant reverse optical transmitters or upgradable reverse optical transmitter splitting, redundant dual power supply configuration, plug-in responder with full monitoring function compatible with CATVisor network management software, plug-in duplex filter, plug-in adjustment module, built-in tri-state gate switch for each output port, and electric gain and slope control for each output port.