Abbreviation of Comité Consultatif International Téléphonique et Télégraphique, an organization that sets international communications standards. CCITT, now known as ITU(the parent organization) has defined many important standards for data communications, including the following:
Group 3: The universal protocol for sending fax documents across telephone lines. The Group 3 protocol specifies CCITT T.4 data compression and a maximum transmission rate of 9,600 baud. There are two levels of resolution: 203 by 98 and 203 by 196.
Group 4 : A protocol for sending fax documents over ISDN networks. The Group 400 protocol supports images of up to 400 dpiresolution.
V.21: The standard for full-duplex communication at 300 baud in Japan and Europe. In the United States, Bell 103is used in place of V.21.
V.22 : The standard for half-duplex communication at 1,200 bps in Japan and Europe. In the United States, the protocol defined by Bell 212Ais more common.
V.22bis : The worldwide standard for full-duplex modems sending and receiving dataacross telephone lines at 1,200 or 2,400 bps.
V.29: The standard for half-duplex modems sending and receiving data across telephone lines at 1,200, 2,400, 4,800, or 9,600 bps. This is the protocol used by fax modems.
V.32 :The standard for full-duplex modems sending and receiving data across phone lines at 4,800 or 9,600 bps. V.32 modems automatically adjust their transmission speeds based on the quality of the lines.
V.32bis:The V.32 protocol extended to speeds of 7,200, 12,000, and 14,400 bps.
V.34 :The standard for full-duplex modems sending and receiving data across phone lines at up to 28,800 bps. V.34 modems automatically adjust their transmission speeds based on the quality of the lines.
V.42 : An error-detection standard for high-speed modems. V.42 can be used with digital telephone networks. See MNPfor a competing standard.
V.42bis:A data compression protocol that can enable modems to achieve a data transfer rate of 34,000 bps.
V.90: The standard for full-duplex modems sending and receiving data across phone lines at up to 56,600 bps.
X.25: The most popular packet-switchingprotocol for WANs.
X.400: The universal protocol for e-mail. X.400 defines the envelope for e-mail messages so all messages conform to a standard format.
X.500: An extension to X.400 that defines addressing formats so all e-mail systems can be linked together.
Short for Complementary Code Keying, a set of 64 eight-bit code words used to encode data for 5.5 and 11Mbps data rates in the 2.4GHz band of 802.11b wireless networking. The code words have unique mathematical properties that allow them to be correctly distinguished from one another by a receiver even in the presence of […]
Acronym for Cisco Certified Network Associate indicates a foundation in and apprentice knowledge of networking. CCNA certified professionals can install, configure, and operate LAN, WAN, and dial access services for small networks (100 nodes or fewer), including but not limited to use of these protocols: IP, IGRP, Serial, Frame Relay, IP RIP, VLANs, RIP, Ethernet, […]
Short for Call Control eXtensible Markup Language, CCXML is an XML-based language designed to provide telephony call control support for VoiceXML and other dialogue systems. CCXML can control the setup, monitoring and tear-down of phone calls. CCXML can provide a complete telephony service application, comprised of Web server CGI compliant application logic.
Short for Compact Disc Audio, CDA (.cda) are audio files that can be stored on CD media. The .cda files are representations of CD audio tracks. CDA (.cda) files can be played only from a CD-ROM. This is format used for encoding music on all commercial compact discs. [Adapted from CoolUtils.com]
Abbreviation of Copper Data Distribution Interface, a network technology capable of carrying data at 100 Mbps over unshielded twisted pair (UTP) cable. CDDI is a trade name of Crescendo Communications (acquired by Cisco Systems in 1993) and commonly used instead of the general term Twisted Pair Physical Layer Medium (TP-PMD). TP-PMD is the general ANSI […]