Alvarion BreezeMAX 3500 System Manual page 307

PIU Power Interface Unit
POTS Plain Old Telephone System. A basic analog telephone
equipment.
PSU Power Supply Unit
PPPoE Point-to-Point Protocol over Ethernet. PPPoE relies on two widely
accepted standards: PPP and Ethernet. PPPoE is a specification
for connecting the users on an Ethernet to the Internet through a
common broadband medium, such as a single DSL line, wireless
device or cable modem. All the users over the Ethernet share a
common connection, so the Ethernet principles supporting
multiple users in a LAN combines with the principles of PPP,
which apply to serial connections.
QAM Quadrature Amplitude Modulation. A technique used in wireless
applications to double the available bandwidth by combining two
amplitude-modulated signals. The two combined signals differ in
phase by 90 degrees; this technique doubles the bandwidth by
combining the two signals at the source before transmission,
transmitting digital data at a rate of 4 bits per signal change.
QoS Quality of Service. Measure of performance for a transmission
system that reflects its transmission quality and service
availability.
QPSK Quadrature Phase Shift Keying. A data transfer technique used
in coaxial cable networks that sends data using modulating
signals. Four different phases represent data, with each signal's
information determined by the signal before it. For example, if a
phase stays the same from one signal to the other, the
information has not changed.
RF Radio frequency. An AC signal of high enough frequency to be
used for wireless communications.
RSSI Received Signal Strength Indicator. A signal or circuit that
indicates the strength of the incoming (received) signal in a
receiver.
BreezeMAX System Manual
Glossary
IX