Polycom RealPresence - Page 116

Polycom RealPresence Collaboration Server 800s Getting Started Guide
A-4 Polycom, Inc.
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.
QCIF 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.
QoS Quality of Service. QoS defines the performance of a network service, such as
the average delay between packets.
RS-232 A standard for serial interface connection.
RTV Real Time Video protocol provides high quality video conferencing capability to
Microsoft OCS (Office Communicator Server) endpoints.
SIP 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.
Span An ISDN line or leased line. A span may be of either T1 (United States) or E1
(Europe) type. Also called a circuit.
SRTP Encryption of SIP Media is supported using SRTP (Secured Real-time
Transport Protocol) and the AES key exchange method.
T1 Line A 1.5Mb digital switched line used in the United States.
ToS Type of Service. ToS defines optimization tagging for routing audio and video
packets.
WAN Wide Area Network. A communications network that services a geographical
area larger than the LAN.
Whiteboard An on-screen shared notebook for placement of shared documents.
Abbreviation/
Term
Explanation