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A range of power supplies specifically designed for the VX2300 2 wire bus system:
The 2321 power supply is for small scale systems with no more than 1 entrance and a maximum of 20 phones.
The 2311P power supply is for systems with more than 1 entrance and up to a maximum of 100 phones. it contains 3 jumpers to adjust the output voltage (V1=Low, V2=Medium, V3=High)
The 2322 device connects directly to the 2 wire BUS and has an output that provides 12Vdc (100mA) to power peripherals such as the 4800 codelock.