The XE1214B5 is a complete, self contained 1200/300 bps modem in small, component form. It contains all circuitry necessary for a complete modem, including an internal, FCC Registered, Data Access Arrangement (DAA) for direct connection to the telephone line, and a serial TTL interface. With the addition of line driver and receiver ICs (such as the MC1488 and MC1489), this serial interface may be easily converted to a full RS232C serial interface.