Detailed Product Description optic modemModel name: BD-OP-E1Product function: E1 fiber modem is ... 20km,power AC 220VBD-OP-E1/DC-48V E1 fiber optic modem,sigle fiber 20km,power DC 48VBD-OP-FE1/AC220V ... Framed E1 fiber optic modem,sigle fiber 20km,power AC 220VBD-OP-FE1/DC ... -48V Framed E1 fiber optic modem,sigle fiber 20km,power DC 48V