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5.2
NSL Relay Control Unit and Expanders
The TX3-NSL-8M NSL Relay Control Unit, TX3-8EC and TX3-16EC NSL
Relay Backplane Expanders perform the following functions:
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5.2.1
TX3-NSL-8M NSL Control Unit
The TX3-NSL-8M Relay Control Unit consists of:
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Figure 32 shows a TX3-NSL-8M Relay Control Unit.
Figure 32.
TX3 Telephone Access System Installation and Operation Manual
Telephone switching functionality to facilitate voice communication
between the resident's phone and the lobby
Generating call waiting tones to the resident if the line is busy.
Provide access control by the resident using the telephone keypad.
Low power operation from one 16V AC transformer.
NSL Main Controller Board
NSL Backplane Board
TX3-NSL-8M Relay Control Unit
NSL Relay Cabinet Installation and Wiring
NSL Backplane Board
NSL Main Controller
63
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