8 Port Low Cost FXS USB Channel Bank

Last week I attended a presentation at Adelaide University by a student named Tim Ansell. For his honors project Tim has developed an 8 channel FXS channel bank that connects to a host PC via USB, not unlike the Xorcom Astribank products.

The channel bank uses FXS interface chips and a PIC microcontroller. Signal processing such as echo cancellation and DTMF detection is performed by the Host PC. The advantage of this design is low cost.

Tim demonstrated telephones making calls to each other, using the the PIC to perform some simple switching. His next steps are to complete the interface to the Host PC and Tim also has many ideas for cost reduction.

Tim is considering commercialising his design – please email him directly for more information.

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