... channel at most, common PSTN mode can support 4 channel,8channel,16 channel, at most 256 channel . Our system can work with ... /disarm feature and security guard patrol log checking/saving/backing system 16 perfect data auto backup function17 English. Spanish, chinese , ... company used industrial personal computer(IPC) to manage alarm system, the system was fragile, IPC tend to be out of order from ...