User Manual

Glossary
4Motion 918 System Manual
MTU Maximum Transmission Unit. This is the greatest amount of data that can be
transferred in one physical frame on the network. If a packet that has a smaller MTU
than the packet's frame length is sent, fragmentation will occur. For TCP MTU can
range from 68 to 1500 bytes. Larger MTUs provide for lower overhead (fewer
headers).
MS Mobile Station. The equipment used by the end user to access the WiMAX network.
NAI Network Address Identifier. Used to create a new unique subscriber identifier, when
a subscriber enters the network without a user name.
NAP Network Access Provider. A NAP is a business entity that provides WiMAX radio
access infrastructure to one or more Network Service Providers (NSPs). An NAP
implements this infrastructure using one or more ASNs.
NAS Network Access Server. A Network Access Server operates as a client of RADIUS.
The client is responsible for passing user information to designated RADIUS
server(s(, and then acting on the response.
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.
NOC Network Operations Center. The physical space from which a typically large
telecommunications network is managed, monitored and supervised.
NPU Network Processing Unit
NRT-VR Non Real Time - Variable Rate. Service supporting non-real-time applications with
variable bit rates that require guaranteed data rate and are delay-tolerant such as file
transfers
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.
NWG Network Working Group. The WiMAX Forum's Network Working Group (NWG) is
responsible for developing the end-to-end network requirements, architecture, and
protocols for WiMAX, using IEEE 802.16e-2005 as the air interface.
OA&M Operation, Administration & Maintenance. Provides the facilities and the personnel
required to manage a network.
OCXO Oven-Controlled crystal oscillator often used in navigation system clocks, frequency
standards, MTI radars, wireless base stations, telecom timing modules and precision
test equipment.
ODU Outdoor Unit