Master NSL Relay Cabinet
- Main NSL Controller Board
- NSL Backplane and one PS-24/PS-24P transformer
- Support up to 8 2012K NSL Telephone Line Relay Cards and Relay
- Support a total of 96 Residents
- Switch between the telephone lines, resident lines and the TX3
- Series Lobby Unit(s).
- Generates call waiting tones to the resident
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