FXS100allows the FT400P card to termiante analog telephone lines (POTS). The module passes all the call features any standard analog telephone line will support. FXS100 is a single channel module, its a FT400P's daughter card. Support all BORSCHT functions. Support A _ law/u _ Law compiled code Built-in power vary, need to offer 3V3 and 12V outer power only, pretty simple and convenient. Nearly all indexes can be programmed to adjust and establish through SPI Exchangable with Digium modules: It is mixable with X100M/S100M of Digium. Applications: Exchanger, Deployment machine, Analog asterisk card, EPON terminal station, etc.