Functional Features：

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Adopting two bus control with positive and negative polarity, up to 99 bus extensions or sockets can be monitored on both buses. 24V power supply, two-way calling. The system has designed a single communication output specifically for connecting non bus fire telephone extensions and sockets, which can connect up to 50 non bus telephone extensions or sockets in parallel. Capable of detecting extension and line faults. The system switchboard adopts LCD Chinese character graphic display. By displaying Chinese character menus and prompt information, various functional operations and call status can be displayed very intuitively, making it convenient to use. A large capacity FLASH memory can store over 9 hours of call recordings and 500 records, accurately recording each part of the call, the time, type, and content of the call.

Technical Parameter：

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Power supply voltage: DC24V ± 10%
Working current approximately: ≤ 0.5A
Voice frequency range: 300~3400 Hz
Voice transmission loss:<5dB
Extension power consumption: Monitoring current<1mA
Call current:<25mA
Bus length: maximum 1500m
Bus capacity: up to 99 encoded addresses (set in binary by encoding switch)
Size: 482.6mmx88.1mmx155.0mm
Weight: 2.5kg