Microwave Data Systems iNET 900 Series User Manual page 166

from the number and order of bits in a data string. This value is com-
pared with a locally-generated value and a match indicates that the mes-
sage is unchanged, and therefore valid.
Data Circuit-terminating Equipment—See DCE.
Data Communications Equipment—See DCE.
Datagram—A data string consisting of an IP header and the IP message
within.
Data Terminal Equipment—See DTE.
dBi—Decibels referenced to an "ideal" isotropic radiator in free space.
Frequently used to express antenna gain.
dBm—Decibels referenced to one milliwatt. An absolute unit used to
measure signal power, as in transmitter power output, or received signal
strength.
DCE—Data Circuit-terminating Equipment (or Data Communications
Equipment). In data communications terminology, this is the "modem"
side of a computer-to-modem connection. Port of the transceiver
COM1
is set as DCE.
Decibel (dB)—A measure of the ratio between two signal levels. Fre-
quently used to express the gain (or loss) of a system.
Delimiter—A flag that marks the beginning and end of a data packet.
Device Mode—The operating mode/role of a transceiver (Access Point
or Remote) in a wireless network.
DHCP (Dynamic Host Configuration Protocol)—An Internet stan-
dard that allows a client (i.e. any computer or network device) to obtain
an IP address from a server on the network. This allows network admin-
istrators to avoid the tedious process of manually configuring and man-
aging IP addresses for a large number of users and devices. When a
network device powers on, if it is configured to use DHCP, it will con-
tact a DHCP server on the network and request an IP address.
The DHCP server will provide an address from a pool of addresses allo-
cated by the network administrator. The network device may use this
address on a "time lease" basis or indefinitely depending on the policy
set by the network administrator. The DHCP server can restrict alloca-
tion of IP addresses based on security policies. An Access Point may be
configured by the system administrator to act as a DHCP server if one
is not available on the wired network.
Digital Signal Processing—See DSP.
158 MDS iNET 900 Series User's Guide MDS 05-2806A01, Rev. E.1