Glossary (T)
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T.120 DATA STANDARD
Data sharing protocol for multipoint data communication in a multimedia conferencing environment. T.120 enables white board collaborations, file transfers, graphic presentations and application sharing between participants in a conference.
T-1
The interface for PRI ISDN lines used in the USA and some Asia
Pacific countries. A T-1 connection has up to 23 B channels and
1 D channel, and transmits at rates of up to 1.544 Mbps.
TCP
Transmission Control Protocol. A reliable transport layer on top of IP. TCP provides transport functions which ensure that the total amount of bytes sent is received correctly by the called party.
TCS4
TCS4 is a special routing method for incoming H.320 video calls. TCS4 allows direct inward dialing to an endpoint on the IP network via the Gateway when DID is not available.
TD-SCDMA (TIME DIVISION-SYNCHRONOUS CODE DIVISION
MULTIPLE ACCESS)
A 3G mobile telecommunications standard, being pursued in the People's Republic of China by the Chinese Academy of Telecommunications Technology (CATT), Datang and Siemens AG.
TERMINAL EQUIPMENT
Equipment that provides the necessary functions to access networks, including operating adequate signaling protocols and media streams.
TISPAN (TELECOMS & INTERNET CONVERGED SERVICES
& PROTOCOLS FOR ADVANCED NETWORKS)
Formerly Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) is a standardization body of ETSI, specializing in fixed networks and Internet convergence.
TLS (TRANSPORT LAYER SECURITY)
A security solution that provides authentication and encryption of data streams, usually over IP.
TOPOLOGY ISLANDS
IP subnets, characterized by homogeneous and fast LAN connectivity. Dividing the network into islands enables a Gatekeeper to direct calls through the most optimal routes, thus avoiding slow connections or bottlenecks as much as possible.
TPKT
A standard way of defining blocks of data in a TCP stream, since TCP does not have delimiters. During configuration you can define the maximum number of TPKT channels allowed.
TRANSCODING
Transcoding is the conversion of one transmission format into another using various algorithms to achieve wider support of formats at different quality levels.
TTL (TIME TO LIVE)
A set maximum amount of time a packet is allowed to propagate through the network before it is discarded. TTL is a time, typically in seconds, after which the fragment can be deleted by any device on the network. In practice, on the IP network the TTL field is reduced by one on every hop.
TTS (TEXT TO SPEECH)
A method to automatically convert text to speech.
TURN (TRAVERSAL USING RELAY NAT) PROTOCOL
A far-end NAT (Network Address Translation) technique. The media traffic must pass central points on public Internet visible from all sides participating in the SIP session.