Appendix A-Glossary
Polycom, Inc. A-3
H.242 ITU-T standard that defines initiation of communications between systems and
capabilities negotiation procedures.
H.243 ITU-T standard that defines initiation of communications between systems and
capabilities negotiation procedures in multipoint conferences.
H.261 ITU-T standard that defines the Px64 video coding algorithm.
H.263 ITU-T standard that provides improved compression and quality of video
images at a line rate lower than 384 Kbps. This standard is not supported by all
codecs.
H.264* A proprietary Polycom Video compression standard.
H.264 ITU-T standard that provides improved compression and quality of video
images in lower line rate connections and is part of the Highest Common
mechanism in Video Switching conferences.
H.320 ITU-T standard that defines how the H-series video conferencing
recommendations work together.
H.323 ITU-T standard for audio, video and data communications across IP-based
(LAN) networks, including the Internet.
ICE Interactive Connectivity Establishment (ICE) provides a structure/protocol to
unify the various NAT Traversal techniques that are used to cross firewalls.
It enables SIP based endpoints to connect while traversing a variety of firewalls
that may exist between the calling endpoint (local) and the MCU or called
endpoint (remote).
IP Internet Protocol. The working protocol that forms the basis of the internet.
ISDN Integrated Services Digital Network. A set of protocol and interface standards
(voice, video and data) that comprise a telephone network. There are two types
of ISDN lines: BRI and PRI.
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.
LDAP Lightweight Directory Access Protocol.
Line Rate The amount of bandwidth used by a communication device, measured in Kbps
(kilobits per second).
LPR Lost Packet Recovery. An algorithm that creates additional packets that contain
recovery information necessary to reconstruct lost packets.
MCU Multipoint Control Unit. Device which allows more than two sites to be
connected in a video conference.
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
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