GE MDS Mercury 900, Справочное руководство

Страница: 197 / 211

188 Mercury Reference Manual 05-4446A01, Rev. E
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 addresses in a network.
IEEE—Institute of Electrical and Electronic Engineers
IEEE 802.1Q—A standard for Ethernet framing which adds a four-byte
tag after the Ethernet header. The four-byte tag contains a VLAN ID and
a IEEE 802.1P priority value.
IEEE 802.1X—A standard for performing authentication and port
blocking. The 802.1X port/device denies access to the network until the
client device has authenticated itself.
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.
MAC—Media Access Controller
MD5—A highly secure data encoding scheme. MD5 is a one-way hash
algorithm that takes any length of data and produces a 128 bit “finger-
print.” This fingerprint is “non-reversible,” it is computationally infea-
sible to determine the file based on the fingerprint. For more details
review “RFC 1321” available on the Internet.
MIB—Management Information Base
Microcontroller Unit—See MCU.
Mobility—Refers to a station that moves about while maintaining
active connections with the network. Mobility generally implies phys-
ical motion. The movement of the station is not limited to a specific net-
work and IP subnet. In order for a station to be mobile it must establish