Scoop's Yeastar TDM-FXO Station Interfaces are used in conjunction with the TDM-400 and TDM-800 Analog Cards. The module has 2 FXO ports to terminate two analog PSTN(POTS) lines.

Possible Configurations:

TDM-400 & TDM-FXS = 2 x FXS ports
TDM-400 & TDM-FXO = 2 x FXO ports
TDM-400 & 2 x TDM-FXS = 4 x FXS ports
TDM-400 & 2 x TDM-FXO = 4 x FXO ports
TDM-400 & TDM-FXO & TDM-FXS = 2 x FXO ports 2 x FXS ports

TDM-800 & 3 x TDM-FXS = 6 x FXS ports
TDM-800 & 3 x TDM-FXO = 6 x FXO ports
TDM-800 & 4 x TDM-FXS = 8 x FXS ports
TDM-800 & 4 x TDM-FXO = 8 x FXO ports
TDM-800 & TDM-FXO & 3 x TDM-FXS = 2 x FXO ports 6 x FXS ports
TDM-800 & 3 x TDM-FXO & TDM-FXS = 6 x FXO ports 2 x FXS ports
TDM-800 & 2 x TDM-FXO & 2 x TDM-FXS = 4 x FXO ports 4 x FXS ports