Tip: if you're running single mode fiber, work immediately without any fussing. if you're running multi mode fiber ,Please make sure your multi fiber is in good condition, As regular multi mode fiber have larger loss compared with single-mode fiber.If your multi mode fiber has a big loss, it may cause some noise/hum issue, or caused shorter transmission distance, . Please minimize your fiber optic attenuation as much as possible by re-splicing the place between fiber connector and fiber etc. The multi mode fiber attenuation allowable range required is within -1.5dB for 500meters. Phone RJ11 port specifications: 1.Voice coding: PCM coding, 64Kbps per voice 2.Crosstalk attenuation: =65dB 3.Balanced noise: =63.7dBmop 4.Insertion loss: -3 ± 0.75dB 5.Frequency characteristics: 300 to 3400 Hz (-0.6 to +3 dB) 6.Relay port (FXO): connected to the switch 7.Two-wire AC input impedance: 200+680//0.1 O (three components) 8.Ringing voltage: 35 ~ 150V 9.Ringing frequency: 17~60HZ 10.Return loss: 20 db 11.User Interface (FXS): Connect to the user's telephone 12.Two-wire AC input impedance: 200+680//0.1 O (three components) 13.User line loop resistance: less than 1KO (including phone) 14.Ringing voltage peak-to-peak value: 110~150V 15.Ringing frequency: 22~28HZ 16.Feed voltage: 28V 17.Feed current: 20~50mA; 18.Return loss: 20 db 19.Bell flow: AC90 plus or minus 15V Ethernet RJ45 port specifications: 1. Rate: 10M/100Mbps, full duplex, half duplex fully adaptive 2. Actual transmission bandwidth: 50Mbps per network port 3. Protocol: Support IEEE 802.3, IEEE 802.1Q (VLAN) 4. Physical interface: RJ45, support AUTO-MDIX (cross line straight line adaptive) Power supply: 1.Working voltage AC100~240V, DC5V/2A. 2.US power supply adapter. Package include: 1x Telephone Transmitter 1x Telephone Receiver 1x 3M SC/SC singlemode fiber patch cord. 2 x US power supply adapters 1 x Manual

Simple to Install,Plug and Play,No setup or configuration needed, SC connector for fiber optical port, RJ-11 connector for telephone ports and RJ-45 for Ethernet. No Delay Transmission and Protocol Support: Unlike VoIP products - these converters transmit signals directly over fiber cables, thus offering NO DELAYS, plus support for fax & legacy applications that is not supported by VoIP lines. You can setup a POTS phone line and a Fax machine and extend the phone line over fiber. The fax machine connected to the receiver device was able to receive and transmit faxes on POTS lines over the fiber without issues or errors. Extend your Phones and Network: 4 Independent telephone lines + 1 Fast Ethernet (10/100 Mbit/s) port over same Single mode or Multimode fiber cable. Universal for Both Fiber Types: Same media converters can supports Single-mode fiber for a long distance up to 20 km(12miles) and Multimode fiber for a distance up to 500m(0.31miles), wavelength 1310/1550 nm.