Dual 2FXS Plus Plug-On - expansion module - 2 ports

The TSU Multiplexer FXS+ option modules provides four 2-wire interfaces that can operate in the PLAR, Tandem (MEGACOM), or FXS mode. The available modules provide 2- and 4-port voice interfaces that supply line current to station equipment. The original FXS+ modules support message waiting and higher ringing voltages.