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NTBB06GA-93 Nortel Norstar Modular ICS Fiber 6 Port Expansion Card A0404245 The Norstar 6 port fiber expansion card is used on the Norstar Modular ICS KSU unit and allows for up to six expansion modules, fiber trunk module or fiber station module to be added to the MICS. By adding 2 of these cards to the KSU, the control unit will be capable of 12 expansion ports. (Must have XC Software to add 2 expansion cards). This card can also be used for adding NAM voice mail modules to the system.