HP 83206A, User Manual

Page: 293 / 312

293
Glossary
G
lo
ssa
ry
DIG MEAS The screen for digital
measurements primarily in the TIA test
mode.
digital call processing the portion of the
Test Set which control the messages
required to setup and maintain a call in the
digital portion of a cellular phone system.
Disarm Selecting this command stops the
measurement process. See “Arm”.
DMAC Digital Mobile Attenuation Code.
downbanding A special set of frequencies
below the normal cellular band.
DQPSK Differential Quadrature Phase
Shift Keying. A modulation system in
which the signal to be modulated is
digitized, and then transmitted on a carrier
with a phase corresponding to the digital
signal. The actual phase transmitted is
relative to the last phase transmitted.
droop The difference between the level of
the first symbol and the level of the last
symbol captured by the analyzer.
dropped call A call is dropped when the
communication between a mobile and the
base is abruptly terminated.
DSP Digital Signal Processor. A processor
used in the Test Set.
DTC Digital Traffic Channel
DTMF Dual Tone Multiple Frequency
signaling. Each key of the numeric keypad
on a cellular phone is identified by two
signals. These signals are transmitted when
the key is pressed.
DUT Device Under Test. The transceiver
that is to be tested.
DVCC Digital Verification Color Code.
An eight-bit signal sent by the base to the
mobile. Used to generate the Coded Digital
Verification Color Code (CDVCC), which
indicates that the correct data is being
decoded.
emulate To imitate. The Test System
emulates a base station by performing tasks
equivalent to those performed by the actual
base station.
ESN Electronic Serial Number.
EVM (EVM1, EVM10) Error Vector
Magnitude. The magnitude of the error
vector which connects the ideal signal
vector to the signal vector measured at the
point of detection. EVM is the RMS value,
while Peak EVM is the absolute value of the
peak EVM measured. EVM10 is the
normalized measurement of the first 10
symbols of a burst, averaged over 10 bursts.
FACCH Fast Associated Control Channel.
A reverse channel controlling the Reverse
Digital Traffic Channel. See also SACCH.
field A selectable location in the screen.
FSK Frequency Shift Keying.
full-rate As described in TDMA systems,
the transmission rate at which one call uses
only one of the six available slots.
GPIB General purpose interface bus. An
implementation of IEEE-488.2.