The XE1212C is a complete 1200/300 bps Modem in a compact, component form factor. It contains all circuitry necessary for complete modem functionality, including an FCC Part 68 Registered Data Access Arrangement (DAA) for direct connection to the telephone line, and a parallel 8250B UART interface for direct operation with the IBM-PC, XT or AT system bus. It operates from the industry standard 'AT' command set. The XE1212C contains all signal processing functions, including the modulators and demodulators for both PSK and FSK operation, and analog filters.