Telebit T1600 Reference Manual page 224

HDLC-High Level Data Link Control. Communications
protocol developed by the International Standards Organization.
header- In communications protocols, this is the control
information that precedes the message or text portion of a block
of data.
Hertz (Hz)- Unit of frequency; one cycle per second.
Horizontal Redundancy Checking (HRC)-Technique in which
redundant information is included with a block of data for
validating the transmitted data at the receiving end.
host computer-The main computer system in a data
communications system.
Interface -A shared boundary defined by common physical
interconnection characteristics, signal characteristics, and
meaning of interchanged signals.
Interference-Undesirable disturbances or distortions in a data
transmission signal.
ISO- International Standards Organization.
Kermit -A data communications protocol. Also see protocol.
Glossary 7