This is the 6 port fiber expansion card NTBB06 for the Norstar MICS control unit and allows for up to six expansion modules (12X0 fiber trunk module, 0X16 fiber station module, or 0x8 analog station module) to be added to the control unit. By adding 2 of these cards to the MICS the control unit will be capable of maximum capacity(Must have XC Software to add 2 expansion cards).

*Compatible with Norstar Modular ICS (MICS) Phone Systems only.