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Data Communications Equipment (DCE) Examples: Modems and transceivers.
Distinct from DTE, Data Terminal Equipment.
Data Link Layer In Open Systems Interconnection architecture, the layer (Layer 2) that provides services to transfer data over a physical link between open systems. Consists of the LLC and MAC sublayers.
Data Terminal Equipment Examples: computers, terminals, printers. Distinct from
DCE, Data Communications Equipment.
Dotted Decimal The notation for IP, gateway, and name server addresses as well as the subnet mask. It consists of 4 decimal numbers
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. It may also appear in the shortened form, ªInterfaceº. (See also LAN Interface.)
Flash Memory A type of
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 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.)
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.)
Group Address An LLC 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.)
Hostid The hostid is the part of the IP address identifying the host on the network. (See also Netid.)
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.
TCP/IP Ethernet Communications User's Manual ± January 1996 |
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