Codan Radio P25 Training Guide - Manual (Page 112)

TRAINING GUIDE | P25 RADIO SYSTEMS
Chapter 9: P25 Glossary of Terms Page 104
GMSK
Abbreviation for “Gaussian Minimum
Shift Keying” A form of frequency
modulation in which the modulating
signal shifts the output frequency
between predetermined values. A form
of MSK which uses Gaussian low pass
fi ltering of the binary data to reduce
sideband energy.
Golay
Name of a standard error correction
code
GPS
Abbreviation for “Global Positioning
System”
Graceful Close
Method used to terminate a connection
at the transport layer with no loss of
data.
GSM™
Abbreviation for “Group Specialized
Mobile” radio service
Half-Duplex
That mode of operation in which
communications occurs between two
terminals in either direction, but only
one direction at a time. May occur on a
half-duplex or duplex circuit but not on a
simplex circuit.
HDLC
Abbreviation for “Highlevel Data Link
Control.” The international standard for
data link control developed by ISO.
Hex BIT
6 BITs grouped together to represent a
Reed-Solomon code symbol
Hierarchical Numbering
Multiple level numbering. An example is
the telephone number made up of levels
such as “Country Code,” “Area Code,”
“Exchange Number” and “Line Number.”
Hierarchical Routing
Multiple level routing. Used both in
packet switching and circuit switching.
Hub Polling
One of the polling techniques.
Permission to transmit is passed
sequentially from one designated user
to another.
I/O
Abbreviation for “Input and/or Output.”
IEEE
Abbreviation for “Institute of Electrical
and Electronics Engineers, Inc.”
ILS
Abbreviation for an “Input buffer Limiting
Scheme.” A fl ow control scheme that
blocks overload locally generated
arrivals by limiting their number at a
buffer.
IMBE™
Abbreviation for “Improved Multi Band
Excitation”.
Inband Signaling
Signaling that uses frequencies or
time slots within the bandwidth of the
information channel.
Incarnation Number
A unique name or number sent within
a data unit to avoid duplicate data unit
acceptance.
IP
Abbreviation for “Internetwork Protocol”
in the ISO activities, as well as Internet
Protocol in ARPA protocol activities.
IPR
Abbreviation for “Intellectual Property
Rights”. Patents, Copyrights or similar
rights which are proprietary to an
individual, group or company.
IQ Origin Offset
Is a measurement that shows how
well balanced the IQ modulators in the
transmitter are and if there is excessive
leakage around them.