GE 90*-30 PLC Series User Manual page 76

GFK-1322
Ethernet Interface
Flash Memory
Frame
Gateway
Global Address Administration
Group Address
Host
Hostid
IEEE 802
IEEE 802.1
IEEE 802.2
IEEE 802.3
IEEE 802.4
IEEE 802.5
Information Field
Initiating Station
Interface
Internet
Internet Address
Appendix D Glossary
The general term used in this manual to identify the GEnet hardware
module, with or without software, that connects a PLC (or CNC) to a
network. It may also appear in the shortened form, "Interface". (See
also LAN Interface.)
A type of read-only memory that can be erased and reprogrammed
under local software control. It is used to store data that must be
preserved when power is off..
A data structure that consists of fields, predetermined by a protocol,
for the transmission of user data and control data.
A special purpose, dedicated computer that attaches to two or more
networks and routes packets from one to the other. In particular, an
Internet gateway routes IP datagrams among the networks to which it
connects. Gateways route packets to other gateways until they can be
delivered to the final destination directly across the physical network.
(Also sometimes referred to as a router.)
Address administration in which all LAN individual addresses are
unique within the same or other Local Area Networks. (See also
Local Address Administration.)
An LLC address that identifies a group of network nodes on a Local
Area Network.
A computer or workstation that communicates with stations such as
PLCs or CNCs across a network, especially one that performs
supervisory or control functions. Note that this same term is widely
used in TCP/IP literature to refer to any network node that can be a
source or destination for network messages. (See also Hostid.)
The hostid is the part of the IP address identifying the host on the
network. (See also Netid.)
The IEEE 802 LAN series of standards are as follows:
Overview and Architecture.
The Logical Link Control (LLC) sublayer of OSI Data Link Layer
common above all IEEE 802 Medium Access Control (MAC)
sublayers.
CSMA/CD (Ethernet) MAC and Physical Layer standard.
Token Bus (MAP LANs) MAC and Physical Layer standard.
Token Ring (IBM) MAC and Physical Layer standard.
That part of a protocol data unit (PDU) that contains data, as opposed
to the address field and command field.
The station from which an instance of communication (a transaction)
originates. Also referred to as "client."
Shortened form for "Ethernet Interface". The general term used in
this manual to identify the GEnet hardware module, with or without
software, that connects a PLC (or CNC) to a network. (See also LAN
Interface.)
Any collection of networks and gateways that use the TCP/IP
protocols and function as a single, cooperative virtual network,
specifically, the world-wide Connected Internet.
A unique Internet address identifies each node on an IP network (or
system of connected networks). The Internet address is assigned to
the node by the user. (Also known as an IP address.) (See also
Physical Address.)
D
D-5