4 ports FXO/FXS over fiber PCM equipment
4 ports FXO/FXS over fiber PCM device
4 ports 2-wire 4-wire E&M over fiber PCM Multiplexer
4 ports voice PCM equipment
4 ports FXO/FXS over fiber PCM device
4 ports 2-wire 4-wire E&M over fiber PCM Multiplexer
4 ports voice PCM equipment