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H
S
G
™
OT
POT
ATEWAY
carrier frequency
A frequency in a communications channel modulated to carry analog or digital signal information. For
example, an FM radio transmitter modulates the frequency of a carrier signal and the receiver processes the
carrier signal to extract the analog information. An AM radio transmitter modulates the amplitude of a
carrier signal.
CoS
(Class of Service) A category based on the type of user, type of application, or some other criteria that QoS
systems can use to provide differentiated classes of service. The characteristics of the CoS may be
appropriate for high throughput traffic, for traffic with a requirement for low latency, or simply for best
effort. The QoS experienced by a particular flow of traffic will be dependent on the number and type of
other traffic flows admitted to its class. See also, QoS.
Daemon
A program that runs continuously in the background, or is activated by a particular event (for example, an
error may trigger Syslog). The word daemon is Greek for "spirit" or "soul." See also, SYSLOG.
DAT
(Dynamic Address Translation) Nomadix Gateways provide "plug-and-play" access to subscribers who are
misconfigured with static (permanent) IP addresses, or subscribers that do not have DHCP functionality on
their computers. DAT is a Nomadix, Inc. patented technology that allows all users to obtain network access,
regardless of their computer's network settings. See also, DHCP.
DHCP
(Dynamic Host Configuration Protocol) A standard method for assigning IP addresses automatically to
devices connected on a TCP/IP network. When a new device connects to the network, the DHCP server
assigns an IP address from a list of its available addresses. The device retains this IP address for the
duration of the session. When the device disconnects from the network, the IP address becomes available
for reassignment to another device. See also,
IP.
DNS
(Domain Name System) A system that maps meaningful domain names with complex numeric IP
addresses. See also,
Domain Name
Domain Name
A unique and meaningful name representing each addressable computing device on a dynamic network (for
example, the Internet). Some devices have more than one domain name. When a user types a domain name,
requesting a connection to the device, DNS converts the domain name into a numeric IP address. The
location of the device on the network is known by its IP address. WWW.YAHOO.COM is an example of a
commercial domain name on the World Wide Web. See also, DNS, Internet, and
DSSS
(Direct Sequence Spread Spectrum) One of two types of spread spectrum radio—the other being Frequency
Hopping Spread Spectrum (FHSS). DSSS is a transmission technology used in
where a data signal at the sending station is combined with a higher data rate bit sequence, or "chipping"
code, that divides the user data according to a spreading ratio. The chipping code is a redundant bit pattern
for each bit that is transmitted, which increases the signal's resistance to interference. If one or more bits in
the pattern are damaged during transmission, the original data can be recovered due to the redundancy of
the transmission.
Glossary of Terms
Dynamic IP
Address,
and
IP
Address.
IP
Address,
Static IP
Address, and
IP
Address.
WLAN
transmissions
TCP/
263
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