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GFK-1541B Appendix A Glossary A-5
A
Internet Group Management Protocol (IGMP) The Internet standard protocol that handles
multicast group management messages.
Internet Protocol (IP) The Internet standard protocol that defines the Internet datagram and
provides the basis for the Internet packet delivery service. (See also Transmission Control
Protocol (TCP).)
Inter Repeater Link (IRL) A mechanism for interconnecting two and only two repeater units. The
Inter Repeater Link acts at the Physical Layer, ISO layer 1.
IP Address See Internet Address.
LAN Interface A 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.
LAN Interface Status Bits (LIS Bits) The LIS bits comprise bits 1-16 of an 80-bit status bit
area. The location of this 80-bit status area is assigned using the PLC programming software
in the “Status Address” field. The LIS bits contain information on the status of the Local
Area Network (LAN) and the Ethernet Interface itself.
Linear Topology A network topology in which nodes are each connected at a point along a
common continuous cable which has no loops and only two endpoints.
Link Service Access Point (LSAP) A Data Link layer SAP. A single byte that identifies the
routing of data received by the network node.
LIS Bits See LAN Interface Status Bits.
Local Address Administration Address administration in which all LAN individual addresses
are unique within the same Local Area Network. (See also, Global Address Administration.)
Local Area Network (LAN) A computer network located on a user’s premises within a limited
geographical area.
Local Broadcast A transmission which is directed to every available receiver in the local IP
subnet of the transmitter. A local broadcast is never routed to LANs outside of the local IP
subnet.
Local Station The station at your immediate location, i.e.,
“here”. (See also Remote Station.)
Log Events Events recorded in the system exception log for the LAN Interface. The maximum
number of events in the exception log is 16.
Logical Link Control (LLC) Protocol In a Local Area Network, the protocol that governs the
exchange of frames between network nodes independently of how the transmission medium
is shared.
MAC Address The Medium Access Control (MAC) address is a 12
–
digit hexadecimal number
that identifies a node on a local network. Each Ethernet Interface has its own unique MAC
address.
Medium Access Control (MAC) In a Local Area Network (LAN), the part of the protocol that
governs write (or transmission) access to the transmission medium independently of the
physical characteristics of the medium, but taking into account the topological aspects of the
network, in order to enable the exchange of data between network nodes. The MAC layer is
the lower sublayer of the Data Link Layer, ISO layer 2.
Medium Attachment Unit (MAU) In a network node on a Local Area Network (LAN), a
device used to couple the data terminal equipment (DTE) to the transmission medium. Often