GE MDS MDS iNET-II 900, Справочное руководство

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05-2806A01, Rev. H iNET Series Reference Manual 169
Multiple Address System (MAS) —See Point-Multipoint System.
Network Name —User-selectable alphanumeric string that is used to
identify a group of radio units that form a communications network. The
Access Point and all Remotes within a given system
should have the
same network address.
Network-Wide Diagnostics —An advanced method of controlling and
interrogating GE MDS radios in a radio network.
NTP —Network Time Protocol
Packet —The basic unit of data carried on a link layer. On an IP net-
work, this refers to an entire IP datagram or a fragment thereof.
Passive Scanning —Scanning is a process used by stations to detect
other access points on network to which it may connect if it needs to
roam. Passive scanning is a slower process in which it listens for infor-
mation offered by the access points on a regular basis. Active scanning
is a faster process in which the station sends out probe message to which
the access points respond. Passive scanning can be done while main-
taining the current network connectivity. Active scanning affects the RF
configuration of the radio and therefore, at least temporarily, discon-
nects the station from the access point.
PING— Packet INternet Groper. Diagnostic message generally used to
test reachability of a network device, either over a wired or wireless net-
work.
Point-Multipoint System —A radio communications network or
system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.
Poll —A request for data issued from the host computer (or master PLC)
to a remote radio.
Portability —A station is considered connected when it has successfully
authenticated and associated with an access point. A station is consid-
ered authenticated when it has agreed with the access point on the type
of encryption that will be used for data packets traveling between them.
The process of association causes a station to be bound to an access
point and allows it to receive and transmit packets to and from the access
point. In order for a station to be associated it must first authenticate
with the access point. The authentication and association processes
occur automatically without user intervention.
Portability refers to the ability of a station to connect to an access point
from multiple locations without the need to reconfigure the network set-
tings. For example, a remote transceiver that is connected to an access
point may be turned off, moved to new site, turned back on, and,