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Glossary

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10BaseT

Part of the original IEEE 802.3 standard, 10BaseT is the Ethernet

specification of 10Mbps baseband that uses two pairs of twisted-pair, Cat-
egory 3, 4, or 5 cabling--using one pair to send data and the other to receive.
10BaseT has a distance limit of about 100 meters per segment. See also:
Ethernet and IEEE 802.3.

terminal adapter

A hardware interface between a computer without a

native ISDN interface and an ISDN line. In effect, a device to connect a stan-
dard async interface to a non-native ISDN device, emulating a modem.

terminal emulation

The use of software, installed on a PC or LAN server,

that allows the PC to function as if it were a "dumb" terminal directly
attached to a particular type of mainframe.

TFTP

Conceptually, a stripped-down version of FTP, it's the protocol of

choice if you know exactly what you want and where it's to be found. TFTP
doesn't provide the abundance of functions that FTP does. In particular, it
has no directory-browsing abilities; it can do nothing but send and receive
files.

Thicknet

Also called 10Base5. Bus network that uses a thick cable and

runs Ethernet up to 500 meters.

Thinnet

Also called 10Base2. Bus network that uses a thin coax cable and

runs Ethernet media access up to 185 meters.

token

A frame containing only control information. Possessing this con-

trol information gives a network device permission to transmit data onto the
network. See also: token passing.

token bus

LAN architecture that is the basis for the IEEE 802.4 LAN spec-

ification and employs token passing access over a bus topology. See also: IEEE.

token passing

A method used by network devices to access the physical

medium in a systematic way based on possession of a small frame called a
token. See also: token.

Token Ring

IBM's token-passing LAN technology. It runs at 4Mbps or

16Mbps over a ring topology. Defined formally by IEEE 802.5. See also: ring
topology and token passing.

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