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Appendix B: Glossary
B-6
ITU-T Standard International Telecommunications Union,
Telecommunication Standardization Sector (formerly
CCITT). An international group that produces official
standards for telecommunications.
LAN Local Area Network. A group of computers and other
devices linked via a network’s operating system.
Line Rate The amount of bandwidth used by a communication
device, measured in Kbps (kilobits per second).
Leased Line A dedicated PRI line supplied by the telephone company.
See also PRI line.
LSD Low Speed Data. A data channel that allows the
participant to transfer commands from one endpoint to the
camera of another endpoint and control its camera from
far. See also FECC.
LDAP Lightweight Directory Access Protocol.
MCU Multipoint Control Unit. Device which allows more than
two sites to be connected in a video conference.
MPI Multi Protocol Interface that supports connection to
endpoints using communication protocols such as V.35
RS-449 and RS-530 over a serial connection.
Network Service A collection of spans from a fixed service provider.
Network services can be any of the following types:
• Private Network
• Public Utility, including:
• Long distance service
• Local service
• PTT
• PBX; local switchboard leased line
Null modem cable A serial cable designed to eliminate the need for
communication equipment when two digital devices are
directly connected to each other.
Abbreviation/
Term
Explanation