The VX-2000SF Surveillance Frame is the output matrix section of the VX-2000 system that assigns audio signals to individual zones from 4 audio buses. It can be extended to up to 8 units. A total of 10 units of output modules and control modules can be installed per VX-2000SF. The following 6 types of modules can be used: the VX-200SP Pilot Tone Detection module, the VX-200SP-2 Pilot Tone Detection module (End of Line), the VX-200SZ Impedance Detection module, the VX-200SZ-2 Impedance Detection module, the VX-200SI Control Input module, and the VX-200SO Control Output module
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