User's Manual

Table Of Contents
Glossary
BreezeMAX Modular Base Station System Manual 257
NRT Non Real Time. is very similar to the Real-Time polling service except
that connections may utilize random access transmit opportunities
for sending bandwidth requests. These Non Real Time Variable Bit
Rate (NRT-VBR) services, such as file transfer and Internet access
with a minimum guaranteed rate, are characterized by requirement
for a guaranteed rate, but can tolerate longer delays and are rather
insensitive to jitter. Service parameters include CIR, Committed
Time (CT), and MIR that limit the rate as otherwise bandwidth
intensive services may expand to occupy full bandwidth.
OA&M Operation, Administration & Maintenance. Provides the facilities
and the personnel required to manage a network.
ODU Outdoor Unit
OFDM Orthogonal Frequency Division Multiplexing: A method for
multiplexing signals, which divides the available bandwidth into a
series of frequencies known as tones. Orthogonal tones do not
interfere with each other when the peak of one tone corresponds
with the null. The rapid switching, frequency-hopping technique is
intended to allow more robust data service.
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.