User's Manual

Wireless Array
Glossary of Terms 495
cell
The basic geographical unit of a cellular communications system. Service
coverage of a given area is based on an interlocking network of cells, each with a
radio base station (transmitter/receiver) at its center. The size of each cell is
determined by the terrain and forecasted number of users.
channel
A specific portion of the radio spectrum — the channels allotted to one of
the wireless networking protocols. For example, 802.11b and 802.11g use 14
channels in the 2.4 GHz band, only 3 of which don't overlap (1, 6, and 11).
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.
default gateway
The gateway in a network that a computer will use to access another network if
a gateway is not specified for use. In a network using subnets, a default gateway
is the router that forwards traffic to a destination outside of the subnet of
the transmitting device.
DHCP
(Dynamic Host Configuration Protocol) A method for dynamically assigning IP
addresses to devices on a network. DHCP issues IP addresses automatically
within a specified range to client devices when they are first powered up.
DHCP lease
The DHCP lease is the amount of time that the DHCP server grants to the DHCP
client for permission to use a particular IP address. A typical DHCP server allows
its administrator to set the lease time.
DNS
(Domain Name System) A system that maps meaningful domain names with
complex numeric IP addresses. DNS is actually a separate network — if one DNS
server cannot translate a domain name, it will ask a second or third until a server
is found with the correct IP address.