Bradley Smoker 1734-AENT Gateway, Nodes on dissimilar networks, Hardware address, Host name, Hub

Preface 7

This Term	Means
Gateway	A module or set of modules that allows communications between
	nodes on dissimilar networks.
Hardware address	Each Ethernet device has a unique hardware address (sometimes
	called a MAC address) that is 48 bits. The address appears as six
	digits separated by colons (such as, xx:xx:xx:xx:xx:xx). Each digit has a
	value between 0 and 255 (0x00 to 0xFF). This address is assigned in
	the hardware and cannot be changed. The hardware address is
	required to identify the device if you are using a BOOTP utility.
Host name	The host name is the unique name for a computer within its domain.
	It's always the first element of a full name, and, with its domain and
	top-level domain suffix, creates the unique name of that computer on
	the Internet. For example, let's say a trading website is
	www.trading.com. The host name is www, which is not unique on
	the web, but is unique within the trading domain.
	The host name can also refer to the fully qualified domain name
	(FQDN), or in this example, www.trading.com. Both naming methods
	seem to be used interchangeably in various documents. For the
	purposes of this document, the host name will refer to the FQDN, or
	as in this example, www.trading.com.
Hub	A central connecting device that joins devices together in a star
	configuration. Hubs are generally not suitable for use in I/O control
	systems, since they are time-critical applications that cannot tolerate
	lost packets.
Implicit messaging	Real-time messaging of I/O data.
IP	Internet protocol that provides the routing mechanism for messages.
	All messages contain not only the address of the destination station,
	but the address of a destination network, which allows messages to
	be sent to multiple networks within an organization or around the
	world.
IP address	A 32-bit identification number for each node on an Internet Protocol
	network. These addresses are represented as four sets of 8-bit
	numbers (numbers from 0 to 255), with decimals between them. Each
	node on the network must have a unique IP address.
Latency	The time between initiating a request for data and the beginning of
	the actual data transfer.
Multicast	In the CIP producer/consumer model, one producer multicasts
	(broadcasts) the data once to all the consumers.
Producer	The source of information in the CIP networking model. See CIP.
Rack-optimized	A physical and logical collection of application modules.
Subnet mask	An extension of the IP address that allows a site to use a single net
	ID for multiple networks.
Switch	A network device that cross connects devices or network segments.
	A switch provides each sender/receiver the full network bandwidth
	(2x in full duplex mode), reduces collisions, and increases
	determinism.
TCP	The transport control protocol is a more reliable but slower transport
	protocol than UDP. It is used for explicit (not time critical) messaging
	in EtherNet/IP.

Publication 1734-UM011C-EN-P - January 2006