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To tomatge: The 1200baud modem is designed according the bell202s standard. The 9600baud modem is a RS-485 modem. The signals are not transmitted on PSTN/telephone line, they are super imposed on power. So they are transmitted on power on a 4mm² electric cables To BrianG: The...

Hi, I just realised that the carrier frequency is actually 1200Hz-2200Hz for the 1200baud FSK modem and 9600Hz-16800Hz for the 9600baud FSK modem. To cbarn2406: Do you have any technical literature of how about to do it and what sort of hardware do we need to look at?

Thank you for your reply BrianG, I really appreciate it. The wires is own by my company, we use it to control our control system from the master control room. The cables type is the 16mm2 TSP cables. The carrier frequency used by the 1200baud FSK modem is at 1200 Hz with a bandwidth of 2200...

I have two different modem using different FSK modulation format. One is using the old 1200 baud, FSK communication system and another one using the 9600 baud FSK communication system. What I'm trying to do is to multiplex these two diferent signal source so they can both transmitted on the same...

Hi, I'm just wondering does anyone know any good source where I can get some information regarding multiplexing various FSK modulation format? Thank you.