FRM220-FXS-4 - Four POTS RJ11 FXS telephone lines over fiber multiplexer, SFP slot

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MSRP: $1,299.00
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Product description
FRM220-FXS-4 is a 4 channel POTS (Plain Old Telephone System) over fiber converter/extender. The four POTS interface uses a standard RJ-11C modular connector for each copper pair line. A pair of FRM220-FXS-4 and FRM220-FXO-4 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. FXS mode is the reciprocal unit and has ability to act as PSTN and connects to a telephone device.

The small multiplexer offers great flexibility on the fiber port by adopting the widely used industry standard SFP Fast Ethernet 155M rated transceiveron both the FRM220-FXO-4 and FRM220-FXS-4 models.

When the FRM220-FXS-4 card is placed in the FRM220 chassis with SNMP 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. When placed in a single slot chassis and used standalone without management, the card may be configured by DIP switch.

Technical specifications

POTS Line: FXS (Impedance:600ohms, REN:0.4)
Interfaces: RJ11 port 600Ohms and SFP slot fiber port
Operating wavelength: depending on the SFP transceiver used
Operating distance: Up to 120Km on 9/125um single-mode (SM) fiber or 2Km on 50/125um or 62.5/25um multi-mode (MM) fiber
Optical connector: SFP slot (empty), accepting 155Mbps (FE) SFP transceivers
Front LEDs: Power, Fiber Link, System, Test mode, CH1~CH4
Power: External 90-260V AC switching adapter 12VDC@1A with NEMA1-15(2 blades only), US type main plug
Temperature: 0~50°C (Operating); 0~70°C (Storage)
Humidity: 20~80% non condensing (Operating); 0~90% (Storage)
Consumption: less than 5W
Dimensions(WxDxH): 88mm x 155mm x 23mm
Weight: 330g (without AC adapter)
Compliance: CE, FCC Class A
MTBF: 65,000 hours

Additional information on FRM220-FXS-4: PDF datasheet; PDF Installation Manual.

Note: The FRM220-FXO-4 and FRM220-FXS-4 multiplexers REQUIRE SFP transceivers for the optical port. You can check a selection of SFP transceivers on our site or contact our sales department by e-mail or telephone.

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Warranty Information

2 years
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Additional Information

Interface Type:
POTS line
Transceiver Format:
Power Type:
separate AC adapter included
SFP slot
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