A-B B-C C-E E-I I-M M-Q R-T T-X Intro

Technical Glossary T - X TCP/IP - Transmission Control Protocol/Internet Protocol. The dominant protocol suite in the worldwide Internet, TCP is Layer 4, the transport layer. IP is Layer 3, the network layer. TDM - Time Division Multiplexer. A device that enables the simultaneous transmission of multiple independent data streams into a single high-speed data stream. Or Time Division Multiplexing - A means of dividing a digital circuit into several channels by creating a separate Time Slot for each. Channels are essentially groups of bits separated by time and reassembled at the destination. TDM Tributary - A DSU or modem that is, for diagnostic purposes, at a logically subsidiary level in an hierarchical network. Tributary DSUs or modems in a network receive control data from the control DSU or modem, as well as from any network management system present in the network. Telnet - Virtual terminal protocol in the Internet suite of protocols. Allows the user of one host computer to log into a remote host computer. TIMS - Transmission Impairment Measurement Set. UAWG - Universal ADSL Working Group. UNI - User to Network Interface. Upstream - Typically refers to the transmission speed from the customer premises toward the telephone network. URL - Uniform Resource Locator. An Internet standard addressing protocol for location and access of resources. UTP - Unshielded Twisted Pair. See CAT5. VC - Virtual Circuit. A logical connection or packetswitching mechanism established between two devices at the beginning of a transmission. VDSL - Very-high-bit-rate DSL. Generally refers to a data transmission speed from 25 to 50+ Mbps over very short distances. V.Fast Class - A unofficial standard for 28,800 bps transmission. Came before the V.34 standard was approved. VLAN - Virtual LAN. Workstations on different LANs can be connected using VLAN tagging. VLSI - Very Large Scale Integration. VOD - Video On Demand. A service allowing many users to request the same video at the sarne time. Voice Frequency (VF) - The part of the audio frequency range used to transmit voice sound (usually 300 Hz to 3,400 Hz). VoiceSpanTM - A paradyne proprietary technology that provides simultaneous voice and data over a single telephone line. VPN - Virtual Private Network. Software-defined private network. V.xx - Format for standards governing the transmission of data over analog transmission facilities. While most V.xx standards were developed by the International Telecommunications Union (Telecommunications Standards Sector (ITU-TSS, formerly CCITT), some (such as V.32terbo) were developed by vendors and became de facto standards. These standards include: V.17 14.4 Kbps Fax transmission over dial lines V.21 300 bps Dial line modulation V.22 1.2 Kbps Dial line modulation V.22bis 2.4 Kbps Dial line modulation V.27bis 4.8 Kbps Four-wire-leased-line modulation V.27ter 4.8 Kbps Fax transmission over dial lines V.29 9.6 Kbps Four-wire leased-line modulation (data and fax) V.32 9.6 Kbps Dial and two-wire leased-line modulation V.32bis 14.4 Kbps Dial and two-wire leased-line modulation V.32terbo 19.2 Kbps Dial and two-wire leased-line modulation V.33 14.4 Kbps Four-wire leased-line modulation V.34 28.8 Kbps Dial and two-wire leased-line modulation V.34+ 33.6 Kbps Dial and two-wire leased-line modulation V.35 48 Kbps Discontinued modem. Interface still in use. V.42 N/A E ror control procedures on an analog circui V.42bis N/A Data compression on an analog circuit WAN - Wide Area Network. A network that spans a large geographic area. WIPO - World Intellectual Property Organization. XDSL - Refers to all DSL-based services. GO TO OUR HOMEPAGE - CLICK | Products | Terminology | Search | Order | Wanted | email | Site-Map |

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