FANUC Robotics America GFK-1541B User Manual

Frame   A data structure that consists of fields, predetermined by a protocol, for the transmission

of user data and control data.

Gateway   A special purpose, dedicated computer that attaches to two or more (sub)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 (sub)network.  (Also
sometimes referred to as a router.)   A gateway or router connects network nodes at the
Network Layer, ISO layer 3.

Global Address Administration   Address administration in which all LAN individual addresses

are unique within the same or other Local Area Networks.  (See also Local Address
Administration.)

Global Data   See Ethernet Global Data.

Group Address   An IP multicast address that identifies a group of network nodes on a Local

Area Network.

Host   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.)

Host Group   A group IP address used to receive multicast IP messages from the network.  Host

Group addresses must be valid Class D (multicast) IP addresses.

Hostid   The hostid is the part of the IP address identifying the host on the network.  (See also

Netid.)

Hub   See Repeater

IEEE 802   The IEEE 802 LAN series of standards are as follows:

IEEE 802   Overview and Architecture.

IEEE 802.2   The Logical Link Control (LLC) sublayer of OSI Data Link Layer common above

all IEEE 802 Medium Access Control (MAC) sublayers.

IEEE 802.3   CSMA/CD (Ethernet) MAC and Physical Layer standard.

IEEE 802.4   Token Bus (MAP LANs) MAC and Physical Layer standard.

IEEE 802.5   Token Ring (IBM) MAC and Physical Layer standard.

Information Field   That part of a protocol data unit (PDU) that contains data, as opposed to the

address field and command field.

Initiating Station   The station from which an instance of communication (a transaction)

originates.  Also referred to as “client”.

Interface   Shortened form for “Ethernet Interface”.  The general term used in this manual to

identify the GE Fanuc hardware module, with or without software, that connects a PLC (or
CNC) to a network.  (See also LAN Interface.)

Internet Address    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.)

Internet Control Message Protocol  (ICMP)   The Internet standard protocol that handles error

and control messages.

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