Polycom DOC2560A manual Abbreviation, Explanation, Term

Polycom RMX 1500/2000/4000 Getting Started Guide

Abbreviation/	Explanation
Term
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.

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