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Glossary
Rho The measure of the waveform quality
of a modulated signal in a CDMA system.
A received signal is compared to an ideal,
reference, signal. A high correlation
between the received signal and the
reference represents a high waveform
quality factor.
Sync Channel A code channel in the
forward CDMA channel that synchronizes
the mobile station with the base station.
Sync Pulse A pulse that starts both the
frame delay timer and the PN sequence
delay timers. A sync pulse occurs when:
• the Test Set is powered on, or
• an external even-second clock is
received on the CDMA Cellular
Adapter's front-panel EVEN SECOND/
SYNC port.
Test System A test equipment station
consisting of a Test Set, Cellular Adapter,
and PCS Interface. Used for testing CDMA
base station equipment operating in the PCS
band.
System Time The time reference used by
the network. System time is synchronous to
Universal Coordinated Time (except for
leap seconds) and uses the same time origin
as Global Positioning Satellite (GPS) time.
All base stations use the same System Time
(within a small error). Mobile stations use
the same System Time, offset by the
propagation delay from the base station to
the mobile station. See also Universal
Coordinated Time.
Test Set The HP 8921A. Used for
installation and maintenance of AMPS,
TDMA, and CDMA cell site equipment.
Traffic Channel A communication path
between a mobile station and a base station,
used primarily for communicating service-
option related traffic. The term traffic
channel implies a forward traffic channel
and reverse traffic channel pair. See also
forward traffic channel and reverse traffic
channel.
Trigger Event Trigger event describes the
operating state of the DSP analyzer at the
time a qualified trigger causes the DSP
analyzer to acquire and begin measuring the
digitized IF waveform from the CDMA
transmitter-under-test.
Universal Coordinated Time (UCT) An
internationally agreed-upon time scale that
has the same rate as atomic time. UCT is
corrected by step adjustments of exactly one
second as needed to remain within 0.9
seconds of astronomical time.
Uplink See Reverse Link.
Walsh Chip The shortest identifiable
component of a Walsh function. The are 2
N
Walsh chips in one Walsh function where N
is the order of the Walsh function. On the
forward CDMA channel, one Walsh chip
equals 1/1.2288 MHz, or 813.802. . .ns. On
the reverse CDMA channel, one Walsh chip
equals 4/1.2288 MHz, or 3.255... us.
Walsh Cover A coding method that uses
Walsh functions to create a set of mutually
orthogonal CDMA signals. In the CDMA
system, a code channel is formed by a
Walsh cover.