Polycom RealPresence 800s Getting Started Manual page 223

RealPresence Collaboration Server 800s/Virtual Edition Getting Started Guide
Abbreviation/Term
H.323
ICE
IP
ITU-T Standard
LAN
LDAP
Line Rate
LPR
MCU
Null modem cable
Participant
QCIF
QoS
RS-232
RTV
SIP
SRTP
ToS
WAN
Polycom®, Inc.
Explanation
ITU-T standard for audio, video and data communications across IP-based (LAN)
networks, including the Internet.
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).
Internet Protocol. The working protocol that forms the basis of the internet.
International Telecommunications Union, Telecommunication Standardization Sector
(formerly CCITT). An international group that produces official standards for
telecommunications.
Local Area Network. A group of computers and other devices linked via a network's
operating system.
Lightweight Directory Access Protocol.
The amount of bandwidth used by a communication device, measured in Kbps (kilobits per
second).
Lost Packet Recovery. An algorithm that creates additional packets that contain recovery
information necessary to reconstruct lost packets.
Multipoint Control Unit. Device which allows more than two sites to be connected in a video
conference.
A serial cable designed to eliminate the need for communication equipment when two
digital devices are directly connected to each other.
A person using an endpoint to connect to a conference. When using a Room System,
several participants use a single endpoint.
Quarter CIF. A video format with image size of 176x144 pixels that transmits 9.115 Mbps at
30 frames per second (a quarter of the capacity of CIF). For more information, see CIF.
Quality of Service. QoS defines the performance of a network service, such as the average
delay between packets.
A standard for serial interface connection.
Real Time Video protocol provides high quality video conferencing capability to Microsoft
OCS (Office Communicator Server) endpoints.
Session Initiation Protocol. An application-layer protocol designed to work over IP
networks. A SIP service defines the properties and the IP addresses of the SIP network
components.
Encryption of SIP Media is supported using SRTP (Secured Real-time Transport Protocol)
and the AES key exchange method.
Type of Service. ToS defines optimization tagging for routing audio and video packets.
Wide Area Network. A communications network that services a geographical area larger
than the LAN.
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