Polycom RealPresence Getting Started Manual page 116

Polycom RealPresence Collaboration Server 800s Getting Started Guide
Abbreviation/
Term
Participant
PRI
PSTN
QCIF
QoS
RS-232
RTV
SIP
Span
SRTP
T1 Line
ToS
WAN
Whiteboard
A-4
Explanation
A person using an endpoint to connect to a conference. When using a Room
System, several participants use a single endpoint.
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.
Public Switched Telephone Network.
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.
An ISDN line or leased line. A span may be of either T1 (United States) or E1
(Europe) type. Also called a circuit.
Encryption of SIP Media is supported using SRTP (Secured Real-time
Transport Protocol) and the AES key exchange method.
A 1.5Mb digital switched line used in the United States.
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.
An on-screen shared notebook for placement of shared documents.
Polycom, Inc.