User Manual

Glossary
4Motion 919 System Manual
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. Out-of-band management is a method wherein management
information exchanged between the network element and its associated
management application is carried on a separate communications path from the
user data that is coming to/from the network element. Conversely, in-band (IB)
management is management data that is carried across the same interface as user
data.
OSPF Open Shortest Path First. A link-state IGP (Interior gateway protocol) that makes
routing decisions based on the shortest-path-first (SPF) algorithm (also referred to
as the Dijkstra algorithm).
OSS Operations Support Systems. A system that processes telecommunications
information supporting various management functions, such as billing, customer
care, network management, inventory control, maintenance, trouble ticket reporting,
surveillance and service provisioning; not considered a network element or part of
the network itself.
PDA Personal Digital Assistant. A handheld computing device.
PDU Protocol Data Unit. The concept of a PDU is used in the OSI reference model. From
the perspective of a protocol layer, a PDU consists of information from the layer
above plus the protocol information appended to the data by that layer. . For
example, a frame is a PDU of the Data Link Layer, and a packet is a PDU of the
Network Layer.
PEP Policy Enforcement Point is an entity in a policy-based system where decisions are
enacted.
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.
PHS Payload Header Suppression. PHS is a technique used to mask redundant cell,
frame, or packet header information when one or more of the same type of higher
layer data PDU's are transported as the payload of an 802.16 MAC PDU.
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.