Analog building intercom system: are based on analog technology to transmit audio and video signals, generally shared widely used bus line transmission signal. Thistechnology system the following main issues:


1, anti-interference ability. Due to interference, often there is no signal or image, the sound is not clear and so on;
2, the transmission distance is limited. Analog signal attenuation and distortioneasily, distance to be increased when the amplifier not to mention networking costs, we can not ensure the reduction of the signal;
3, the use of bus technology and more particularly busy. Because the same bus callsonly between two points;
4, single function. In addition to supporting simple 

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