Siemens HiPath C10 User Manual page 277

Term
NAT
Netmask
NIC
NMS
NTP
OFDM
OID
OPSEC
Table 19
A31003-W1040-U101-1-7619, July 2006 DRAFT
HiPath Wireless Controller, Access Points and Convergence Software V4.0, C10/C100/C1000 User Guide
Explanation
Network Address Translator. A network capability that enables a group
of computers to dynamically share a single incoming IP address. NAT
takes the single incoming IP address and creates new IP address for
each client computer on the network.
In administering Internet sites, a netmask is a string of 0's and 1's that
mask or screen out the network part of an IP address, so that only the
host computer part of the address remains. A frequently-used
netmask is 255.255.255.0, used for a Class C subnet (one with up to
255 host computers). The ".0" in the "255.255.255.0" netmask allows
the specific host computer address to be visible.
Network Interface Card. An expansion board in a computer that
connects the computer to a network.
Network Management System. The system responsible for managing
a network or a portion of a network. The NMS talks to network
management agents, which reside in the managed nodes.
Network Time Protocol, an Internet standard protocol (built on top of
TCP/IP) that assures accurate synchronization to the millisecond of
computer clock times in a network of computers. Based on UTC, NTP
synchronizes client workstation clocks to the U.S. Naval Observatory
Master Clocks in Washington, DC and Colorado Springs CO. Running
as a continuous background client program on a computer, NTP sends
periodic time requests to servers, obtaining server time stamps and
using them to adjust the client's clock. (RFC1305)
Orthogonal frequency division multiplexing, a method of digital
modulation in which a signal is split into several narrowband channels
at different frequencies. OFDM is similar to conventional frequency
division multiplexing (FDM). The difference lies in the way in which the
signals are modulated and demodulated. Priority is given to
minimizing the interference, or crosstalk, among the channels and
symbols comprising the data stream. Less importance is placed on
perfecting individual channels.
OFDM is used in European digital audio broadcast services. It is also
used in wireless local area networks.
Object Identifier.
OPSEC (Open Platform for Security) is a security alliance program
created by Check Point to enable an open industry-wide framework for
interoperability of security products and applications. Products
carrying the "Secured by Check Point" seal have been tested to
guarantee integration and interoperability.
Networking terms and abbreviations
hwc_glossary.fm
Glossary
277