User's Manual

MDS 05-6302A01, Rev. B MDS Mercury 16E Technical Manual 81
versed process is applied at the other end of the network extracting the
data from the IP envelope, resulting in the original packet in the original
protocol.
Endpoint—IP address of data equipment connected to the ports of the
radio.
Equalization—The process of reducing the effects of amplitude, fre-
quency or phase distortion with compensating networks.
Fade Margin—The greatest tolerable reduction in average received
signal strength that will be anticipated under most conditions. Provides
an allowance for reduced signal strength due to multipath, slight antenna
movement or changing atmospheric losses. A fade margin of 15 to 20
dB is usually sufficient in most systems.
Fragmentation—A technique used for breaking a large message down
into smaller parts so it can be accommodated by a less capable media.
Frame—A segment of data that adheres to a specific data protocol and
contains definite start and end points. It provides a method of synchro-
nizing transmissions.
Hardware Flow Control—A transceiver feature used to prevent data
buffer overruns when handling high-speed data from the connected data
communications device. When the buffer approaches overflow, the
radio drops the clear-to-send (CTS) line, that instructs the connected
device to delay further transmission until CTS again returns to the high
state.
Host Computer—The computer installed at the master station site, that
controls the collection of data from one or more remote sites.
HTTP—Hypertext Transfer Protocol.
ICMP—Internet Control Message Protocol.
IGMP (Internet Gateway Management Protocol)—Ethernet level
protocol used by routers and similar devices to manage the distribution
of multicast traffic in a network.
IEEE—Institute of Electrical and Electronic Engineers.
Image (File)—Data file that contains the operating system and other
essential resources for the basic operation of the radio’s CPU.
LAN—Local Area Network.
Latency—The delay (usually expressed in milliseconds) between when
data is applied at the transmit port at one radio, until it appears at the
receive port at the other radio.