User's Manual

Glossary
BreezeMAX Extreme 259 System Manual
NMS Network Management System. A system responsible for managing at least part of a
network. An NMS is generally a reasonably powerful and well-equipped computer,
such as an engineering workstation. NMSs communicate with agents to help keep
track of network statistics and resources.
NSP Network Service Provider. An NSP is a business entity that provides IP connectivity
and WiMAX services to WiMAX subscribers compliant with the established service
level agreement. The NSP concept is an extension of the Internet service provider
(ISP) concept, providing network services beyond Internet access. To provide these
services, an NSP establishes contractual agreements with one or more NAPs. An
NSP may also establish roaming agreements with other NSPs and contractual
agreements with third-party application providers (e.g. ASP, ISP) for the delivery of
WiMAX services to subscribers. From a WiMAX subscriber standpoint, an NSP may
be classified as a home or visited NSP.
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.
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.
PS Power Supply
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.
RADIUS Remote Authentication Dial-In User Service, an authentication and accounting
system used by many Internet Service Providers (ISPs). When you connect to the
system you must enter your username and password. This information is passed to
a RADIUS server, which checks that the information is correct, and then authorizes
access to the system.