Both synchronous and asynchronous transmissions
are supported, including such technologies as Voice over IP (VoIP) and IP multicast.
, at speeds from 50 bits per second (b/s) to 19.2 kb/s, are accomplished by connecting the RS-3232-C port on a student's computing device, for example, to an ITE-type (for Integrated Terminal Equipment) telephone.
Some local data sets provide such features as full and half-duplex operation, diagnostics and self-tests, synchronous and asynchronous transmissions
, and controlled or continuous carrier operation.