RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Getting Started Guide
Polycom®, Inc. 187
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.
Participant A person using an endpoint to connect to a conference. When using a Room System,
several participants use a single endpoint.
PRI Priority Rate Interface. An ISDN interface designed for high volume data communication.
Consists of 23 B channels of 64 Kbps each and one D channel of 64 Kbps. In Europe, the
PRI line provides 30 B channels + one D channel.
PSTN Public Switched Telephone Network.
Abbreviation/Term Explanation
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