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CTC UNION Multi Channel POTS Over Fibre Converter. I/O Device Cables Marketing Information: You can improveCTC UNION Multi Channel POTS Over Fibre Converter. FXO connects to PBX. Extend telephone voice transmission up to 120km. Network management via terminal. Caller ID Pass Through. FRM220 FXO 4 FXS 4 are 4 channel POTS (Plain Old Telephone System) over fibre converter extender. The four POTS connection uses standard RJ11C modular connectors for each copper pair connection. A pair of FRM220 FXO 4 FXS 4 is required to implement an end to end system. FXO