APPENDIX F - GLOSSARY
235
EATON
PXG600E User Manual • IM02603003E
Rev 5, 11-May-2012 • Firmware Version 5.03:3835
MAC Address:
In computer networking, a Media Access Control address
(MAC address) is a unique identifier attached to most network adapters
(NICs). It is a number that acts like a name for a particular network adapter,
so, for example, the network cards (or built-in network adapters) in two
different computers will have different names, or MAC addresses, as would
an Ethernet adapter and a wireless adapter in the same computer, and as
would multiple network cards in a router. However, it is possible to change
the MAC address on most of today's hardware.
Main:
A Main represents a primary electrical feed entering the facility or
equipment. A Main can be unmonitored or monitored by a meter and / or
monitored by a trip unit.
Mbps:
Mega Bits Per Second
Modbus:
Modbus is a communications protocol published by Modicon in
1979 for use with its programmable logic controllers (PLCs). It has become a
de facto standard communications protocol in industry, and is now the most
commonly available means of connecting industrial electronic devices.
Modbus RTU:
Modbus RTU is a compact, binary representation of the data
Modbus TCP/IP:
Modbus TCP/IP is very similar to Modbus RTU, but
transmits the protocol packets within TCP/IP data packets.
mV:
MilliVolt - 1/1000 of a volt
MVAR:
Megavolt Amperes Reactive - One Million Volt Amperes Reactive
MVARh:
Megavolt Amperes Reactive Hours - 1 Million Volt Ampere Reactive
Hours
MWh:
Megawatt Hours - One million Watt Hours
Netmask:
A mask or setting normally obtained from an IT manager that is
used to determine to what subnet an IP address belongs. An IP address has
two components, the network address and the host address. For example,
consider the IP address 150.215.017.009. Assuming this is part of a Class B
network, the first two numbers (150.215) represent the Class B network
address, and the second two numbers (017.009) identify a particular host on
this network.
Network Management System:
A Network Management System (NMS) is a
combination of hardware and software used to monitor and administer a
network. Usually it refers to just the software piece that is deigned to
manage network devices that support SNMP. IBM
®
Director, Sun
NetManager and HP Openview™ are examples of NMSs.
Peak Demand:
The greatest of all the demands that have occurred during a
specified period of time; determined by measurement over a prescribed
time interval.
Port:
(1) An interface on a computer to which you can connect a device.
Personal computers have various types of ports. Internally, there are several
ports for connecting disk drives, display screens, and keyboards. Externally,
personal computers have ports for connecting modems, printers, mice, and
other peripheral devices. Almost all personal computers come with a serial
RS-232C port or RS-422 port for connecting a modem or mouse and a
parallel port for connecting a printer. (2) In TCP/IP and UDP networks, an
endpoint to a logical connection. The port number identifies what type of
port it is. For example, port 80 is used for HTTP traffic.
