User's Manual

Glossary
BreezeMAX CPEs Product Manual 137
NAT Network Address Translation. Basic Network Address Translation
(Basic NAT) is a method by which IP addresses are mapped from one
group to another, transparent to end users. Network Address Port
Translation, or NAPT is a method by which many network addresses
and their TCP/UDP ports are translated into a single network address
and its TCP/UDP ports. Together, these two operations, referred to as
traditional NAT, provide a mechanism to connect a realm with private
addresses to an external realm with globally unique registered
addresses.
NIC Network Interface Card. An expansion board you insert into a
computer (or a built-in component) that enables the computer to
connect to a network. Most NICs are designed for a particular type of
network, protocol, and media, although some can serve multiple
networks.
NPU Network Processing Unit
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.
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.
PDA Personal Digital Assistant. A handheld computing device.