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- T1
- A term for a digital
carrier facility used to transmit a DS-1 formatted
digital signal at 1.544 megabits per second. [Source:
RFC1392]
- T3
- A term for a digital
carrier facility used to transmit a DS-3 formatted
digital signal at 44.746 megabits per second. [Source:
FYI4]
- TAC
- See: Terminal Access
Controller (TAC)
- TAU
- Technical Advisory Unit,
a JISC sponsored service, performs regular monitoring
of JANET, JISCMail and the National Cache, and advises
JISC on technical matters.
- talk
- A protocol which allows
two people on remote computers to communicate in a
real-time fashion. See also: Internet Relay Chat.
[Source: RFC1392]
- TCP
- See: Transmission
Control Protocol
- TCP/IP Protocol Suite
- Transmission Control
Protocol over Internet Protocol. This is a common
shorthand which refers to the suite of transport and
application protocols which runs over IP. See also:
IP, ICMP, TCP, UDP, FTP, Telnet, SMTP, SNMP. [Source:
RFC1392]
- TechDis
- JISC funded Technology
for Disabilities information service.
- TELENET
- A public packet switched
network using the CCITT X.25 protocols. It should not
be confused with Telnet. [Source: RFC1392]
- Telnet
- Telnet is the Internet
standard protocol for remote terminal connection
service. It is defined in STD 8, RFC
854 and extended with options by many other RFCs.
[Source: RFC1392]
- TEN-155
- Trans European Network
at 155Mbit/s, now replaced by GÉANT.
- TERENA
- See: Trans-European
Research and Education Networking Association
- Terminal Access
Controller (TAC)
- A device which was once
used to connect terminals to the Internet, usually
using dialup modem connections and the TACACS
protocol. While the device is no longer in use, TACACS+
is a protocol in current use. [Source: RFC1983]
- terminal emulator
- A program that allows a
computer to emulate a terminal. The workstation thus
appears as a terminal to the remote host. [Source:
MALAMUD]
- terminal server
- A device which connects
many terminals to a LAN through one network
connection. A terminal server can also connect many
network users to its asynchronous ports for dial-out
capabilities and printer access. See also: Local Area
Network. [Source: RFC1392]
- TeX
- A free typesetting
system by Donald Knuth.
- Three Letter Acronym
(TLA)
- A tribute to the use of
acronyms in the computer field. See also: Extended
Four Letter Acronym. [Source: RFC1392]
- three-way-handshake
- The process whereby two
protocol entities synchronize during connection
establishment. [Source: RFC1208]
- Time to Live (TTL)
- A field in the IP header
which indicates how long this packet should be allowed
to survive before being discarded. It is primarily
used as a hop count. See also: Internet Protocol.
[Source: MALAMUD]
- TLA
- See: Three Letter
Acronym
- TN3270
- A variant of the Telnet
program that allows one to attach to IBM mainframes
and use the mainframe as if you had a 3270 or similar
terminal. [Source: BIG-LAN]
- token ring
- A token ring is a type
of LAN with nodes wired into a ring. Each node
constantly passes a control message (token) on to the
next; whichever node has the token can send a message.
Often, "Token Ring" is used to refer to the
IEEE 802.5 token ring standard, which is the most
common type of token ring. See also: 802.x, Local Area
Network. [Source: RFC1392]
- topology
- A network topology shows
the computers and the links between them. A network
layer must stay abreast of the current network
topology to be able to route packets to their final
destination. [Source: MALAMUD]
- TP0
- OSI Transport Protocol
Class 0 (Simple Class). This is the simplest OSI
Transport Protocol, useful only on top of an X.25
network (or other network that does not lose or damage
data). [Source: RFC1208]
- TP4
- OSI Transport Protocol
Class 4 (Error Detection and Recovery Class). This is
the most powerful OSI Transport Protocol, useful on
top of any type of network. TP4 is the OSI equivalent
to TCP. [Source: RFC1208]
- traceroute
- A program available on
many systems which traces the path a packet takes to a
destination. It is mostly used to debug routing
problems between hosts. There is also a traceroute
protocol defined in RFC
1393. [Source: RFC1983]
- transceiver
- Transmitter-receiver.
The physical device that connects a host interface to
a local area network, such as Ethernet. Ethernet
transceivers contain electronics that apply signals to
the cable and sense collisions. [Source: RFC1208]
- transit network
- A transit network passes
traffic between networks in addition to carrying
traffic for its own hosts. It must have paths to at
least two other networks. See also: backbone, stub
network. [Source: RFC1392]
- Transmission Control
Protocol (TCP)
- An Internet Standard
transport layer protocol defined in RFC
793. It is connection-oriented and
stream-oriented, as opposed to UDP. See also:
connection-oriented, stream-oriented, User Datagram
Protocol. [Source: RFC1392]
- Transport Layer
- The OSI layer that is
responsible for reliable end- to-end data transfer
between end systems. [Source: RFC1208]
- Transport Layer
Security (TLS)
- An IETF standard in RFC
2246 for eliciting secure (i.e. encrypted)
connections (e.g. to web services) across a public
network such as the Internet. Formerly known as Secure
Sockets Layer (SSL).
- Trojan Horse
- A computer program which
carries within itself a means to allow the creator of
the program access to the system using it. See also:
virus, worm. See RFC
1135. [Source: RFC1392]
- TS29
- a network independent
version of X29. The dependency of X29 on X25 is
removed. See also Green Book.
- TSI
- The MAPS Transport
Security Initiative.
- TTFN
- Ta-Ta For Now [Source:
RFC1392]
- TTL
- See: Time to Live
- tunnelling
- Tunnelling refers to
encapsulation of protocol A within protocol B, such
that A treats B as though it were a datalink layer.
Tunnelling is used to get data between administrative
domains which use a protocol that is not supported by
the internet connecting those domains. See also:
Administrative Domain. [Source: RFC1392]
- TVN
- Thames Valley Network.
- twisted pair
- A type of cable in which
pairs of conductors are twisted together to produce
certain electrical properties. [Source: RFC1392]
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