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Glossary
Frame A basic timing interval in the
system. For the Access channel, paging
channel, and traffic channel, a frame is
20 ms long. For the sync channel, a frame is
26.666...ms long.
Frame Clocks A phase-locked loop in the
CDMA Cellular Adapter that provides the
following CDMA clocks for internal or
external (through the rear-panel, 9-pin
connector) use:
•2 second
• 80 millisecond
• 27 millisecond
• 20 millisecond
Frame Delay Pulse An internal timing
pulse that initiates the Cellular Adapter’s
CDMA frame clocks. The frame delay
pulse occurs after the frame delay timer
expires.
Frame Delay Timer A timer that
determines the interval between the sync
pulse and the frame delay pulse.
Frame Error Rate (FER) A measure of
the performance of a digital receiver. For a
given data rate, the ratio of frames received
incorrectly to the total number of frames
sent. Also referred to as Frame Error Ratio.
Intermediate Frequency (IF) The
frequency resulting from a downconversion
process.
Mcps Megachips per second (one million
chips per second).
Modulation Quality See Rho.
Modulation Symbol The output of the
data modulator before spreading. On the
reverse traffic channel, 64-ary orthogonal
modulation is used and six code symbols
are associated with one modulation symbol.
On the forward traffic channel, each code
symbol (when the data rate is 9600 bps) or
each repeated code symbol (when the date
rate is less than 9600 bps) is one modulation
symbol.
N
o
Noise spectral density. See E
b
/N
o
.
Offset Quadrature Phase Shift Keying
(OQPSK) A form of modulation that
applies different data sequences to two
carriers separated by 90
o
. The two different
data sequences are staggered by half a
modulation symbol time. See Also
Quadrature Phase Shift Keying.
Paging Channel A code channel on the
forward channel used for paging mobile
stations. Of the 64 Walsh functions used for
channelization on the forward link, one
through seven (inclusive) can be used for
paging channels.
PCS see Personal Communications
Services.
PCS Interface. The HP 83236B. Used to
translate signals from the PCS band into the
range of the Test Set and to provide a
calibrated CDMA signal source.