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The ADTRAN Total Access 1500 Dual FXS/DPO provides for a two-wire 600/ 900 ohm + 2.16µF interface between a VF transmission and signaling facility and a PCM interface. It works in conjunction with the Total Access 1500 Dual FXO/DPT containing the necessary circuitry to convert two voice data signals from the customer's loop to PCM digital data and to convert PCM digital data from the carrier to voice data. The primary applications in FXS or FXO mode are for providing an FX off-premise station line or an FX trunk from a PBX to a Central Office or special access service. In DPT mode, the primary application is to provide an interface to a two-wire pulse or multi-frequency (MF) originating signal. A common application in Tandem mode is the termination of Class IV toll switches. Private hot-line application connects a two-phone set in a Private Line Auto Ring-down mode. In DPO mode, the primary application is to provide an interface to a two-wire dial pulse or multi-frequency (MF) originating circuit.