FRM-220 FXO/FXS fiber to analog phone

FRM-220 FXO/FXS fiber to analog phone

Extends analog phone over fiber from 2 to 120 km
Supports remote in-band management, IP based Web GUI, Telnet, SNMP via NMC card in 19″ rack
Adjustable FXO or FXS mode
Supports FXS to FXO direct connection
Transmits Caller ID

The FRM220-FXO/FXS media converters can be used to connect analog telephones to a PBX or directly via FO.
The converters are used as a pair and are connected to the copper connection via an RJ-11C connector.
In FXO mode, the converter simulates a telephone and is connected to a PBX via copper.
In FXS mode, the converter acts like a telephone system and is connected directly to the telephone terminal.
When the FRM220-FXO/FXS is used together with the 19-inch rack and a network management card, the devices can be monitored and configured locally or remotely via SNMP or in-band management.

The SFP modules must be ordered separately.

Have a look at our SFP modules.


Single module in top hat rail housing

Further housing types are available

Fiber optic interface

Connection: 1 x 9 (SC) or SFP LC
FO: MM 50/125μm, 62.5/125μm, SM 9/125μm
Distance: MM 550m, 2km, SM 15/30/50/80/120km, WDM 20/40/60km
Wavelength: MM 1310nm, SM 1310,1550nm, WDM (type A) 1310Tx/1550Rx, WDM (type B) 1550Tx/1310Rx

Telephone interface

Connection: 1 x RJ-11
FXO mode: Impedance : 600 Ohm, Coding: 16 bits Liner, Call frequency: 20 – 50 Hz, Coupling attenuation: 0,0 +/- 1,0 dB at, 1 KHz
FXS mode: Impedance : 600 Ohm, Coding: 16 bits Liner, Dialing: DTMF and Pulse, Call Frequency: 20/25/30/50 Hz, Insertion Loss: 0,0 +/- 1,0 dB at 1 KHz

LED indicators

FX-Link, Phone ACT, Test

Power supply

12VDC: < 4W
Module: 12 VDC
DIN rail: 12-60 VDC
Desktop unit: 230 VAC/ 24VDC/ 48VDC


155 x 88 x 23 mm (D x H x W) without top hat rail clamp
top hat rail mounting in metal housing
IP standard: IP30
Temperature: Temperature: -20 – +70°C

The transmission of my personal data is voluntary. I have the opportunity to withdraw my data at any time. My data is stored exclusively for the purpose of processing my request. A passing on to third does not take place.

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