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Glossary
The Glossary section defines the terms used in the
ePowerSwitch System -MP environment.
Agent
Implemented SNMP applications in network elements
(hosts). Agents perform the network management’s
functions as requested by the network administrator from
an NMS.
Dry Closure Input
Non-powered contact type inputs—switch, relay contact,
open-collector.
Dry Closure Output
Form C dry-contact outputs which are common, normally
open, or normally closed.
EtherNet
Local Area Network technology, originally developed by the
Xerox Corporation, can link up to 1,024 nodes in a bus
network. EtherNet provides raw data transfer in a rate of
10 megabits/sec. with actual throughputs in 2 to 3
megabits/sec. using a baseband (single-channel)
communication technique. EtherNet uses carrier sense
multiple access collision detection (CSMA/CD) that
prevents network failures when two devices attempt to
access the network at the same time. LAN hardware
manufactures use EtherNet protocol; their products may
not be compatible.
Gateway
A computer that attaches to a number of networks and
routes packets between them. The packets can be
different protocols at the higher levels.
IP
Internet Protocol—The TCP/IP standard protocol defines
the IP datagram as the unit of information passed across a
network.
IP Address
Internet Protocol Address—A 32-bit address assigned to
hosts participating in a TCP/IP network. The IP address
consists of network and host portions. It is assigned to an
interconnection of a host to a physical network.
MAC
Medium Access Control—The network layer between the
physical and the datalink layers. Specifically, the physical
(hardware) address exists in this layer.
MIB
Management Information Base—The database, i.e., set of
variables maintained by a gateway running SNMP.
NC
Normally Closed —Refers to a contact switch that is
normally closed.
NIC
Network Interface Controller—The hardware interface to the
physical connection to the network.
NMS
Network Management Station