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Glossary
Glossary
subsystem A section of firmware grouped
together for a specific task.
sync location The time in number of bit
periods from the trigger to the beginning of
the first sync word detected.
TDMA Time Division Multiple Access. A
type of frequency division in which one
frequency is shared by multiple activities
sequentially. As a cellular phone system, a
TDMA system is defined by both a
frequency and a time slot.
test mode A mode in which the mobile
allows a traffic channel to become active
specifically for the purpose of testing.
Test System The Test equipment,
typically a Test Set and a Cellular Adapter,
connected together.
TIA/EIA Telecommunications Industry of
America/Electronics Industry of America.
An organized body of interested parties
which creates industry standards for cellular
communications and other systems.
TIA/EIA-136 A standard created by the
TIA/EIA to define a Time Division
Multiple Access (TDMA) cellular phone
system. Its major differentiating feature
from most other TDMA systems is its
Digital Control Channel (DCCH).
TIA/EIA-627 a TIA/EIA specification
describing a TDMA system with an ACC,
AVC, and DTC.
time alignment The process by which the
data transmitted by the mobile is aligned
within its time slot.This is necessary in
order to prevent bursts of data from multiple
mobiles occupying the same channel from
colliding at the base station.
To Screen An area of the Test Set’s
display in which several features can be
selected.
toggle To switch back and forth, typically
between two choices.
traffic channel A frequency channel in
which voice and other signals are
transmitted digitally.
TS Test Set or Test System.
TX Transmit
TX frequency error The difference
between the assigned carrier frequency and
the measured carrier frequency.
TX power The transmitted power.
user group A group of cellular users,
given special capability to communicate
with each other.
voice channel A frequency channel in
which voice and other signals are
transmitted by analog methods.
VSELP Vector Sum Excited Linear
Predictive. An encoding method for voice.