Wintec's embedded modem is based on a Silicon Labs ISO modem chipset. There is a long product history with this embedded modem at Wintec. Two different interfaces have been implemented for this product to meet various customer demands. One is a parallel mode interface where the data transactions between the host and the modem use an 8-bit data bus with a set of micro-controller control signals at the interface. The other uses an UART interface, where the embedded modem is operates in serial mode to handle data transfer with the host system.