T1 T3 T-carrier
T-connector TAC TACACS
tags talk TASM
TCP TCP/IP Protocol Suite TCU
TDM TDR Telecom Italia
telecommunications TELENET telex
Telia Telnet TEN34
TERENA termid terminal adapter
terminal emulator terminal server terminator
TeX TFTP TGA
THC over X.25
THEnet Thinnet three-way-handshake
Throughput TIA TIFF
TIGA Time Slot time-out
TLA TINET
TN3270 token token bus
token passing Token Ring TOP
topology TOS TP
TPA TP0 TP4
trailer TRAM
transaction trans. services layer Transceiver
transceiver cable transit bridging transit network
translational bridging transm. control layer transmission group
transmission link TRANSPAC transparent bridging
Transparent Mode Transport Layer traps
tree topology TRICKLE Trojan Horse
TRouter Trumpet Winsock
Trunk TSR
TTFN TTL (Time To Live) TTL
tunnelling TUV TUVAKA
Twisted Pair TYMNET Type 1 operation
Type 2 operation type of service routing
T1 An AT&T term for
a digital carrier facility used to transmit a DS-1
formatted digital signal at 1.544 megabits per second.
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]
T-carrier Time division
multiplexed transmission method usually referring to a line or cable carrying
a DS-1
signal.
T-connector T-shaped
device woth two female and one male BNC connectors.
TAC (Terminal Access
Controller). A device which connects terminals to the Internet, usually
using dialup modem connections and the TACACS
protocol. [Source: RFC1392]
TACACS (Terminal Access
Controller Access Systems). A System developed by the Defense
Data Network community to control access to its TACs.
TACACS is supported by Cisco products.
tags Formatting odes
used in HTML (e.g., <h1>, </H1>,
<P>)
talk A protocol which allows
two people on remote computers to communicate in a real-time fashion. See
also: Internet Relay Chat. [Source: RFC1392]
TASM (Turbo Assembler).
Microsoft.
TCP (Transmission Control
Protocol). An Internet Standard transport layer protocol defined in STD
7, RFC
793. It is connection-oriented and stream-oriented, as opposed to UDP.
See also: connection-oriented,
stream-oriented, User
Datagram Protocol. [Source: RFC1392]
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: IONL
IP, ICMP,
TCP, UDP,
FTP, Telnet,
SMTP , SNMP.
[Source: RFC1392]
TCU (Trunk Coupling
Unit). In Token Ring networks,
a physical device that enables a station to connect to the trunk cable.
TDM (Time Division
Multiplexing). A technique where information from multiple channels can
be allocated bandwidth on a single wire based on time slot assignment.
TDR (Time Domain Reflectometer).
Device capable of sending signals through a network medium to ceck cable
continuity and other attributes. TDRs are used to find physical layer network
problems.
telecommunications Term
referring to communications (usually involving computer systems) over the
telephone network.
Telecom
Italia A new name of the Italian Telephone Company. (ex
SIP)
TELENET A public packet
switched network using the CCITT X.25
protocols. It should not be confused with Telnet.
[Source: RFC1392]
telex Teletypewriter service
allowing subscribers to send messages over the PSTN.
Telia
One of the PNOs in Sweden. This
PNO was at one time the only PNO in Sweden, and is (AFAIK) by far the largest
in the current swedish "general" PNO market.
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]
TEN34
(Trans-European Network). Interconnect at 34-155 Mbps EU
funded project, coordinated by DANTE.
Originally ten countries focussing on 34Mbps ATM,
now broader perspective and membership.
TERENA
TERENA - Trans-European Research and Education Networking Association
- was formed in October 1994 by the merger of RARE
(Réseaux Associés pour la Recherche Européenne) and
EARN (European Academic and Research
Network).
"...to promote and participate in the development of a high
quality international information and telecommunications infrastructure
for the benefit of research and education." (TERENA Statutes).
TERENA carries out technical activities and provides a platform for
discussion and education to encourage the development of a high- quality
computer networking infrastructure for the European research community.
termid Also called Xid,
an SNA cluster controller identification. Termid is only meaningful for
switched lines.
terminal adapter An ISDN
modem.
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]
terminator Electrical resistence
at the end of a transmission line that adsorbs signals on the line, thereby
keeping them from bouncing back and being heard again by network stations.
TeX A powerful markup language
for typesetting systems by Donald Knuth
TFTP (Trivial File Transfer
Protocol). A simplified version of FTP
allowing the transfer of files from one computer to another over a network.
TGA (Targa). Ususally Targa file
are used to write 32 bit files which would be 24 bit true color with an
8 bit Alpha channel
THC over X.25 Feature providing
TCP/IP header compression
over X.25 links, for purposes of
link efficiency.
THEnet (Texas Higher Education
Network). Regional network comprising over 60 academic and researcher institutions
in the Texas area.
Thinnet A term used to
definew a thinner, less expansive version of the cable specified in the
IEEE 802.3 10Base2 standard when
compared with Cheapernet.
three-way-handshake The
process whereby two protocol entities synchronize during connection establishment.
Throughput Rate of information
arriving at, and possibly passing through, a particular point in a network
system.
TIA
(The Internet Adapter). Is an Internet access utility that lets
you use popular TCP/IP software such as Netscape
and Eudora with any regular UNIX shell account. TIA, from Cyberspace
Development, Inc. converts your shell account into a "pseudo-SLIP/PPP"
account the same way an electrical adapter converts a two-prong outlet
into a three-prong outlet. See also: SLiRP
TIFF (Tag Image File Format).
A bitmapped file format used for scanning and storage of gray-scale images.
TIGA (Texas Instruments Graphics
Architecture). A high-resolution graphics architecture for PCs.
Time Slot A portion of
a serial multiplex of information dedicated to a single channel.
time-out An event that
occurs when one network device expects to hear from, but does not hear,
another network device within a specified period of time. The resulting
time-out usually results in a retrasmission of information or the outright
dissolving of the virtual circuit between the two devices.
TLA (Three Letter Acronym).
A tribute to the use of acronyms in the computer field. See also: Extended
Four Letter Acronym. [Source: RFC1392]
TINET
A Swiss Internet Provider.
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 A control information
frame, possession of which grants a network device the right to transmit.
token bus LAN architecture
using token passing access over a bus topology. This LAN architecture is
the basis for the IEEE 802.4 LAN
specification.
token passing Access method
by which network devices access the physical medium is an orderly fascion
based on possession of a small frame called a token. See also contention
and circuit switching.
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: IEEE 802.x, Local
Area Network. [Source: RFC1392]
TOP (Technical Office Protocol).
An OSI-based architecture developed
for office communications by Boeing.
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]
TOS Type of Service. See
COS.
TP See: Twisted
Pair
TPA (Transient Program Area)
CP/M
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). Defined by
ISO 8073.
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. Defined by ISO 8073
trailer Control information
appended to the data in a packet.
TRAM (TRAnsputer Module)..
transaction A result -oriented
unit of communication processing.
transaction services layer Layer
7 in the SNA architectural model. See application
layer].
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]
See also MAU
transceiver cable See AUI.
transit bridging Bridging
that uses encapsulation to send a frame between two similar networks over
a dissimilar network.
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]
translational bridging Bridging
between networks with dissimilar MAC sublayer protocols.
transmission control layer Layer
4 in the SNA architectural model.
Responsible for establishing, maintainaing, and terminating
SNA sessions, sequencing data messages, and session level flow control.
transmission group In SNA
routing, one or more parallel connections links treated as one communications
facility.
transmission link See link
TRANSPAC
Major packet data network run by France Telecom.
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 associating and nodes
with bridge ports.
Transparent bridging is so named because the presence of bridges
is transparent to network and nodes.
Transparent Mode The operation
of a digital transmission facility during which the user has complete and
free use of the available bandwidth and is unaware of any intermediate
processing.
Transport Layer Layer 4
of the OSI reference model. The transport
layer is responsible for reliable network communication between end nodes.
It implemnts flow and error control and often uses virtual circuits to
ensure reliable data delivery.
traps Unsolicited messages
sent by an SNMP agent to a network
management system (NMS) that indicate
the occurrence of a significant event.
tree topology LAN topology
similar to a bus topology, except that tree networks can contain branches.
Like the bus topology, transmission s from a station propagate the length
of the medium and are received by all other stations.
TRICKLE Is a service wich
will send you files on request, or by subscription. TRICKLE works with
various anonymous FTP sites, computers in the Internet network that allow
public access and retrieval of software and files. It provides a quick
and easy alternative to FTP, whether or not you have access to the Internet.[Source:
EARN Association]
Trojan Horse A computer
program which carries within itself a means to allow he creator of the
program access to the system using it. See also: virus, worm. See RFC
1135. [Source: RFC1392]
TRouter Cisco product capable
of both routing and communication service.
Trumpet Winsock Trumpet Winsock
is a Windows Sockets 1.1 compatible TCP/IP stack that provides a standard
networking layer for many Windows(tm) networking applications to use, and
has itself been a major vehicle in achieving widespread use of Windows
Sockets 1.1. Check out the Trumpet
Home Page for more information about Trumpet Winsock.
Trunk A single circuit
between two points both of which are switching centers of individual distribution
points. A trunk usually handles many channels simultaneously.
TSR (Terminate-and-Stay Resident)(program).
A program permanently residing in RAM
that can be quickly activated to perform a task while another program is
operating.
TTFN (Ta-Ta For Now)
TTL (Time to Live). 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]
TTL (Transistor-to-Transistor
Logic)
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]
TUV Test agency within
Germany that certifies products to European EMC and safety standards.
TUVAKA
Turkish networks and organizations TR-NET (network & organization).
Twisted Pair Cable made
up of a pair of insulated copper wires wrapped around each other to cancel
the effects of electrical noise. [Source: ZEN ]
TYMNET Major public PSNin
the United States.
Type 1 operation IEEE
802.2 (LLC) connectionless
operation.
Type 2 operation IEEE
802.2 (LLC) connection-oriented
operation.
type of service routing Routing
scheme the choice of a path through the internetwork depends on the charactteristics
of the subnetworks involved and of the packet, as well as the shortest
path to the destination.