NTBB25 Combination card. The Norstar 6 Port Fiber Combination Expansion Card allows addition of up to 6 Norstar Fiber Trunk Cards or Norstar Fiber Station or Norstar Analog Station Modules or a combination of all three and has the Service/Module for a T-1. It also allows to expand the Norstar Modular ICS system beyond the base controller and to run a T1 card. It works with all all versions of the Norstar Modular ICS system.

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