Edge-Core ES3526VA-PoE Installation Manual page 69

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. (Now incorporated in IEEE 802.3-2002.)
IEEE 802.3x
Defines Ethernet frame start/stop requests and timers used for flow control on
full-duplex links. (Now incorporated in IEEE 802.3-2002.)
IEEE 802.3z
Defines CSMA/CD access method and physical layer specifications for 1000BASE
Gigabit Ethernet over fiber cabling. (Now incorporated in IEEE 802.3-2002.)
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.
MIB
An acronym for Management Information Base. It is a set of database objects that
contains information about the device.
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.
Network Diameter
Wire distance between two end stations in the same collision domain.
Glossary-3