| |
|
T |
| T1 |
 |
Communications circuit provided by long-distance carriers
for voice and data transmission (1.544 Mbps in U.S.
or 2.054 Mbps in Europe); may be divided in 24 separate
64 Kb channels; E-1 in Europe. |
| T3 |
|
Digital communications circuit standard created by
AT&T that operates at 44 Mbps. |
| TA |
|
Terminal
Adapter |
| Tank
circuit |
|
Ensures
accurate signal tracking in token ring networks and
prevents degradation of the signal; must
be adjusted manually. |
| TAOS |
|
Terminal
Access Operation System
Transmit
All One Signal
|
| T-connector |
|
A
t-shaped device with two female and one male BNC connectors. |
| TCP/IP |
|
Transmission
Control Protocol/Internet Protocol, set of protocols
developed by the U.S. Defense Department's Advanced
Research Projects Agency (ARPA)
during the early 1970s. Its intent was to develop ways to connect different
kinds of networks and computers. TCP/IP does not have the functionality that
OSI provides. |
| TDM |
|
Time Division Multiplexing, technique where information
from multiple channels may be allocated bandwidth on
a single wire based on time slot assignment. |
| TEI |
|
Terminal
End-point Identifier |
| Telnet |
|
An application that provides a terminal interface between
hosts using the TCP/IP network protocol. It has been
starndardized so that "telnetting" to any
host should give one an interactive terminal session,
regardless of the remote host type or operating system.
Note that this is very different from the LAT software,
which allows only local network access to LAT hosts
only. |
| TL1 |
|
Transaction
Language 1
|
| Terminal
server |
|
Communications
processor that connects asynchronous devices to a LAN
or WAN through network and terminal emulation software. |
| Terminator |
|
Used
on both ends of a standard Ethernet or Thinwire Ethernet
segment, this special connector provides the
50 ohm termination resistance needed for the cable. |
| TFTP |
|
Trivial
File Transfer Protocol, on computers that run the TCP/IP
networking software, TFTP is used to quickly
send files across the network with fewer security features
than FTP. |
| |
|
|
| Thickwire |
|
Half-inch
diameter coax cable |
| Thinwire |
|
Thin coaxial cable similar to that used for television/video
hookups. |
| Throughput |
|
the amount of data transmitted between tow points in
a give na mount of time. E.g., 10 Mbps. |
| TMN |
|
Telecommunications Management Network |
| TN3270 |
|
Terminal
emulation software that allows a terminal to appear
to an IBM host as a 3270 model 2 terminal.
It’s a dumb terminal for IBM mainframes; generally,
a terminal emulation standard for connecting to mainframe
resources. |
| Token |
|
Control information frame, possession of which grants
a network device the right to transmit for a given
amount of time. |
| Token
ring |
|
developed
by IBM, this 4 or 16 Mbps network uses a ring topology
and
a token-passing access method. |
| Topology |
|
The
arrangement of the nodes and connecting hardware that
comprises the network. Types include ring, bus,
star, and tree. |
| TOS |
|
Type of Service. |
| TP |
|
Twisted
Pair cable, consisting of two 18 to 24 AWG (American
Wire Guage) solid copper strands twisted
around each other. The twisting provides a measure
of protection from electromagnetic and radio-frequency
interference. |
| TR |
|
Token
Ring As defined in IEEE 802.5, a communications method
that uses a token to control access to the LAN.
The difference between a token bus and a token ring
is that a token ring LAN does not use a master controller
to control the token. Instead, each computer knows
the address of the computer that should receive the
token next. When a computer with the token has nothing
to transmit, it passes the token to the next computer
in line. |
| TRU |
|
Top
Rack Unit |
| Transaction
Layer |
|
Layer
7 in the SNA architecture model. |
| Transceiver |
|
The
actual device that interfaces between the network and
the local node. The term generally refers to any
connector, such as a MAU, that actively converts signals
between the network and the local node. |
| Transceiver
cable |
|
Cable
that attaches a device either to a standard or thin
coax Ethernet segment. |
| Translation
bridging |
|
Bridging
between networks with dissimilar MAC sublayer protocols. |
| Transparent
bridging |
|
Bridging
scheme preferred by Ethernet and IEEE 802.3 networks
in which bridges pass frames along
one hop at a time based on tables associated end nodes
with bridge ports. |
| Transport
Layer |
|
OSI
layer that is responsible for reliable end-to-end data
transfer between end systems.
|
| TSA |
|
Time
Slot Assignment |
| TSE |
|
Terminal
Switching Exchange |
| TSI |
|
Time
Slot Interchange |
| TTL |
|
Transistor
Transistor Logic |
| Twinaxial
Cable |
|
Contains
two coaxial cable runs. Typically used in a IBM AS/400
environment and connects IBM 5250 to
host. |
| Twisted-Pair
Cable |
|
Inexpensive,
multiple-conductor cable comprised of one or more pairs
of 18 to 24 gauge copper strands.
The strands are twisted to improve protection against
electromagnetic and radio frequency interference. The
cable, which may be either shielded or unshielded,
is used in low-speed communications, as telephone cable.
It is used only in baseband networks because of its
narrow bandwidth. |
| |
|
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