125
Glossary
Table 124
Glossary
Item Description
10BASE-T
The IEEE specification for 10 Mbps Ethernet over Category 3, 4 or 5 twisted pair
cable.
100BASE-TX
The IEEE specification for 100 Mbps Fast Ethernet over Category 5 twisted-pair
cable.
1000BASE-LX
IEEE 802.3z specification for Gigabit Ethernet over 9/125 micron core
single-mode fiber cable.
1000BASE-SX
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125 or
62.5/125 micron core multimode fiber cable.
1000BASE-T
IEEE 802.3ab specification for Gigabit Ethernet over 100-ohm Category 5, 5e
or 6 twisted-pair cable (using all four wire pairs).
Auto-negotiation
Auto-negotiation is where two devices sharing a link, automatically configure to
use the best common speed. The order of preference (best first) is: 1000BASE-T
full duplex, 100BASE-TX full duplex, 100BASE-TX half duplex, 10BASE-T full
duplex, and 10BASE-T half duplex. Auto-negotiation is defined in the IEEE
802.3 standard for Ethernet and is an operation that takes place in a few
milliseconds. Auto-negotiation must be enabled for the 1000BASE-T ports to
operate at 1000 Mbps, full duplex.
Bandwidth
The information capacity, measured in bits per second, that a channel can
transmit. The bandwidth of Ethernet is 10 Mbps, the bandwidth of Fast Ethernet
is 100 Mbps and Gigabit Ethernet is 1000 Mbps.
BPDU
Bridge Protocol Data Unit. A type of information packet that ensures that data is
efficiently exchanged between switches in a LAN. BPDU messages detect loops
in a network, and remove them by shutting down the bridge causing the loop.
Category 3 Cables
One of five grades of Twisted Pair (TP) cabling defined by the EIA/TIA-568
standard. Category 3 is voice grade cable and can only be used in Ethernet
networks (10BASE-T) to transmit data at speeds of up to 10 Mbps.
Category 5 Cables
One of five grades of Twisted Pair (TP) cabling defined by the EIA/TIA-568
standard. Category 5 can be used in Ethernet (10BASE-T) and Fast Ethernet
networks (100BASE-TX) and can transmit data at speeds of up to 100 Mbps.
Category 5 cabling is better to use for network cabling than Category 3,
because it supports both Ethernet (10 Mbps) and Fast Ethernet (100 Mbps)
speeds.
Category 5e Cables
One of five grades of Twisted Pair (TP) cabling defined by the EIA/TIA-568
standard. Category 5e can be used in Ethernet (10BASE-T), Fast Ethernet
(100BASE-TX) and Gigabit Ethernet (1000BASE-T) networks, and can transmit
data at speeds of up to 1000 Mbps.
Category 6 Cables
One of five grades of Twisted Pair (TP) cabling defined by the EIA/TIA-568-B
standard. Category 6 can be used in Ethernet (10BASE-T), Fast Ethernet
(100BASE-TX) and Gigabit Ethernet (1000BASE-T) networks, and can transmit
data at speeds of up to 1000 Mbps.
Summary of Contents for V1905 Series
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