User`s manual

U.S. Robotics I-modem Command Reference
Glossary • Page G-22
handshaking
A sequence that two modems undertake while connecting to agree on the parameters of
the conversation that will ensue. During handshaking, the modems negotiate the speed of
the connection, whether error control and data compression will be used and in what form,
and so forth.
hardware ßow control
A form of ßow control that uses electronic signals to start and stop the ßow of data.
HDLC
See High-Level Data Link Control.
High-Level Data Link Control (HDLC)
A standard protocol devel-oped by the International Standards Organization for soft-ware
appli-cations and communicating devices operating in synchronous
environments. The
protocol deÞnes oper-ations at the link level of communications (for example, the format
of data frames exchanged between modems over a phone line). See BISYNC
, protocol,
SDLC
.