Agilent Technologies S GSM, 8922M manual Gmsk

Glossary

	only uses one burst in 26. When the FACCH steals control from
	the TCH small drop-outs in the speech can often be heard.
Frame	A repetitive collection of time slots in a TDMA system.
GMSK	Gaussian Filtered Minimum Shift Keying. The type of digital
	modulation used for the GSM system.
GSM900	Global System for Mobile Communication. GSM900 is the
	original GSM system, using frequencies in the 900 MHz band,
	and is designed for wide area cellular operation.
Global Phase
Error	An in-channel test of modulation quality for GSM transmitters
	using a constant amplitude envelope when transmitting
	information. Global phase measures the difference between the
	measured phase trajectory and the ideal phase trajectory.
Guard Bits	These bits provide a buffer between adjacent data packets.
	There are ramp-up and ramp-down guard bits.
IMSI	International Mobile Subscriber Identification. A unique
	subscriber number which is contained on the SIM card.
MSK	Minimum Shift Keying. A form of digital modulation in which
	a frequency shift is chosen to exactly twice the data bit rate. It is
	called minimum shift keying because the frequency spacing
	between the two frequency states is the minimum spacing that
	allows the two frequency states to be orthogonal to each other.
PCS1900	Personal Communications System. This is a system used in the
	USA, bands have been released around 1.9 GHz.
PRBS	Pseudo-Random Bit Sequence. A pattern of bits used in bit
	error testing.
Pulsed RF
Power	An in-channel, test of the mobile phone’s ability to correctly
	turn its transmitter on and off.
RACH	RACH (Random Access Channel) is used to grab the attention
	of the BS. RACH is a special short burst used to inform the
	mobile of its timing advance. These bursts are short to avoid
	collisions with other timeslots.

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