SMC Networks 6152PL2 - annexe 1 Installation Manual page 59

Glossary
IEEE 802.3af (PoE)
An IEEE standard for providing Power over Ethernet (PoE) capabilities. When
Ethernet is passed over copper cable, two twisted pairs are used for data transfer,
and two twisted pairs are unused. With PoE, power can either be passed over the
two data pairs or over the two spare pairs.
IEEE 802.3u
Defines CSMA/CD access method and physical layer specifications for
100BASE-TX Fast Ethernet.
IEEE 802.3x
Defines Ethernet frame start/stop requests and timers used for flow control on
full-duplex links.
IEEE 802.3z
Defines CSMA/CD access method and physical layer specifications for 1000BASE
Gigabit Ethernet.
LAN Segment
Separate LAN or collision domain.
LED
Light emitting diode used for monitoring a device or network condition.
Local Area Network (LAN)
A group of interconnected computer and support devices.
Media Access Control (MAC)
A portion of the networking protocol that governs access to the transmission
medium, facilitating the exchange of data between network nodes.
Modal Bandwidth
Bandwidth for multimode fiber is referred to as modal bandwidth because it varies
with the modal field (or core diameter) of the fiber. Modal bandwidth is specified in
units of MHz per km, which indicates the amount of bandwidth supported by the fiber
for a one km distance.
MIB
An acronym for Management Information Base. It is a set of database objects that
contains information about the device.
Network Diameter
Wire distance between two end stations in the same collision domain.
Glossary-3