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NTBB20FB Norstar M12X0 Fiber Trunk Module A0405788 Norstar NTBB20FB M12x0 Fiber Trunk Module allows for the addition of trunk lines to the MICS Norstar control unit. It connects via an expansion port on the 2 port or 6 port fiber expansion cards. Fiber Trunk Modules may be connected to the Modular ICS by a fiber cable Each Fiber Trunk Module holds up to three Trunk Cartridges. This unit comes with no cards installed. Also referred to as 12X0, NTBB20, NTBB20FB-93