User's Manual

Table Of Contents
286 BreezeMAX Modular Base Station System Manual
Glossary
OFDMA Orthogonal Frequency Division Multiple Access. It’s a logical
extension of OFDM and a modulation/multiple access technique.
OFDMA divides a signal into sub-channels (i.e. groups of carriers),
with each sub-channel (or several sub-channels) being allocated to a
different subscriber.
OOB Out-Of-Band
PAP Password Authentication Protocol. A means of authenticating
passwords which is defined in RFC 1334. PAP uses a two-way
handshaking procedure. The validity of the password is checked at
login.
PER Packet Error Rate. In a digital transmission, PER is the percentage
of packets with errors divided by the total number of packets that
have been transmitted, received or processed over a given time
period.
PHY PHYsical Layer. The physical, or lowest, layer of the OSI Network
Model. In a wireless network, the PHY defines parameters such as
data rates, modulation method, signaling parameters,
transmitter/receiver synchronization, etc. Within an actual radio
implementation, the PHY corresponds to the radio front end and
baseband signal processing sections.
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.