The FRM220-FXO is a POTS (Plain Old Telephone System) over fiber converter/extender. The POTS connection uses a standard RJ-11C modular connector for one copper pair connection.
A pair of FRM220-FXO is required to implement an end to end system.
FXO mode connects to a telephone line (PSTN) or PBX station line and has ability to detect ringing voltages and to act as a telephone.
When the FRM220-FXO card is placed in the FRM220 rack with NMC management, in-band management allows configuring and viewing the card and remote converter's status, type, version, fiber link status, on hook status and alarms.
Both card and remote can be configured to enable or disable the port, reset the port and set the FXO mode.