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Cooper Bussmann 5073E-T Managed Ethernet Switch User Manual
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Rev Version 1.1
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C - GLOSSarY
Term
Definition
AWG
American wire gauge (AWG), also known as the Brown & Sharpe wire gauge, is a
standardized wire gauge system used predominantly in the United States and Canada for the
diameters of round, solid, nonferrous, electrically conducting wire.
Bandwidth
The maximum data transfer speed available to a user through a network.
CLI
A command-line interface (CLI), is a means of interacting with a computer program where
the user (or client) issues commands to the program in the form of successive lines of text
(command lines).
COS
Class of service (COS) is a parameter used in data and voice protocols to differentiate
the types of payloads contained in the packet being transmitted. The objective of such
differentiation is generally associated with assigning priorities to the data payload.
CSMA/CD
Carrier Sense Multiple Access/Collision Detection is the access method used on an Ethernet
network. A network device transmits data after detecting that a channel is available. However,
if two devices transmit data simultaneously, the sending devices detect a collision and
retransmit after a random time delay.
DDM
Digital Diagnostics monitoring (DDM) enables you to monitor real-time parameters of the SFP
ports and set whether the port logs alarm events to the Syslog on the switch.
DHCP
Dynamic Host Configuration Protocol is a utility that enables a server to dynamically assign
IP addresses from a predefined list and limit their time of use so that they can be reassigned.
Without DHCP, an IT manager would need to manually enter in all the IP addresses of all the
computers on the network. If DHCP is used, whenever a computer logs onto the network, it
automatically gets an IP address assigned to it.
DIN Rail
A DIN rail is a metal rail of a standard type widely used for mounting circuit breakers and
industrial control equipment inside equipment racks.
DNS
Domain Name Service is a program that translates URLs to IP addresses by accessing a
database maintained on a collection of Internet servers. The program works behind the
scenes to facilitate surfing the Web with alpha versus numeric addresses. A DNS server
converts a name like mywebsite.com to a series of numbers like 107.22.55.26. Every website
has its own specific IP address on the Internet.
DSCP
Differentiated Services Code Point (DSCP) is a field in an IP packet that enables different
levels of service to be assigned to network traffic. This is achieved by marking each packet
on the network with a DSCP code and appropriating to it the corresponding level of service.
GVRP
GARP VLAN Registration Protocol or Generic VLAN Registration Protocol (GVRP) is a
protocol that facilitates control of virtual local area networks (VLANs) within a larger network.
GVRP conforms to the IEEE 802.1Q specification, which defines a method of tagging frames
with VLAN configuration data. This allows network devices to dynamically exchange VLAN
configuration information with other devices.
HTTP
The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed,
collaborative, hypermedia information systems, and is the foundation of data communication
for the World Wide Web. Hypertext is a multi-linear set of objects, building a network by using
logical links (the so-called hyperlinks) between the nodes (text or words). HTTP is the protocol
to exchange or transfer hypertext.
IEEE
Institute of Electrical and Electronics Engineers, New York, www.ieee.org. A membership
organization that includes engineers, scientists and students in electronics and allied fields.
It has more than 300,000 members and is involved with setting standards for computers and
communications.
IGMP Snooping
IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP)
network traffic. The feature allows a network switch to listen in on the IGMP conversation
between hosts and routers. By listening to these conversations the switch maintains a map of
which links need which IP multicast streams. Multicasts may be filtered from the links that do
not need them, and this controls which ports receive specific multicast traffic.
I/O
Input / Output. The term used to describe any operation, program or device that transfers
data to or from a computer.
