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NP5400 11g Wireless Access Point User Guide Page 27
The lease time can vary depending on how long a user is
likely to require the Internet connection at a particular
location. It's especially useful in education and other
environments where users change frequently. Using very
short leases, DHCP can dynamically reconfigure networks in
which there are more computers than there are available IP
addresses.
DHCP supports static addresses for computers containing
Web servers that need a permanent IP address. DNS - The
domain name system (DNS) is the way that Internet domain
name are located and translated into Internet Protocol (IP)
addresses. A domain name is a meaningful and easy-to-
remember "handle" for an Internet address.
DSSS (Direct-Sequence Spread Spectrum) - DSSS generates a
redundant bit pattern for all transmitted data. This bit
pattern is called a chip (or chipping code). Even if one or
more bits in the chip are damaged during transmission,
statistical techniques embedded in the receiver can recover
the original data without the need for retransmission. To an
unintended receiver, DSSS appears as low power wideband
noise and is rejected (ignored) by most narrowband receivers.
However, to an intended receiver (i.e. another wireless LAN
endpoint), the DSSS signal is recognized as the only valid
signal, and interference is inherently rejected (ignored).
Dynamic IP Address An IP address that is automatically assigned to a client
station in a TCP/IP network, typically by a DHCP server.
Network devices that serve multiple users, such as servers
and printers, are usually assigned static IP addresses.
ESS (Extended Service Set) - A set of more than two or more
BSSs (multiple access points) forming a single network.
Firmware Code that is written onto read-only memory (ROM) or
programmable read-only memory (PROM). Once firmware
has been written onto the ROM or PROM, it is retained
even when the device is turned off.
IEEE The Institute of Electrical and Electronics Engineers. The
IEEE describes itself as "the world's largest technical
professional society-promoting the development and
application of electrotechnology and allied sciences for the
benefit of humanity, the advancement of the profession, and
the wellbeing of our members." The IEEE fosters the
development of standards that often become national and
international standards. The organization publishes a number
of journals, has many local chapters, and several large