The MSM6927 and the MSM6947 are OKI's 1200 bps single chip modem series which transmit
and receive serial, binary data over a switched telephone network using frequency shift
keying(FSK).

The MSM6927 is compatible with ITU-T V.23 series data sets, while the MSM6947 is compatible
with Bell 202 series data sets.

These devices provide all the necessary modulation, demodulation, and filtering required to
implement a serial, asynchronous communication link.