Polycom DOC2560A manual Abbreviation, Explanation, Term

Chapter A-Glossary

Abbreviation/	Explanation
Term
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.
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.

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