Polycom DOC2066F manual Procedures and describes network maintenance functions

Appendix A: Glossary

Abbreviation/	Explanation
Term
E1 line	An 2 Mb digital switched line used in Europe.
Endpoint	An endpoint is any conferencing unit or participating/
	connected party.
G.711	ITU-T audio algorithm, 64Kbps, 3.4 kHz.
G.722	ITU-T audio algorithm, 64Kbps, 7 kHz.
G.728	ITU-T audio algorithm, 16Kbps, 3.4 kHz.
Gatekeeper	A type of server that performs two main functions: translates
	LAN alias addresses of terminals and gateways to IP
	addresses and provides bandwidth management.
H.221	ITU-T standard that defines how to multiplex video, audio,
	control, and user data into one serial bit stream.
H.230	ITU-T standard that defines simple multipoint control systems
	procedures and describes network maintenance functions.
H.231	ITU-T standard that defines a set of MCU functions and
	operational requirements.
H.242	ITU-T standard that defines initiation of communications
	between systems and capabilities negotiation procedures.
H.243	ITU-T standard that defines initiation of communications
	between systems and capabilities negotiation procedures in
	multipoint conferences.
H.261	ITU-T standard that defines the Px64 video coding algorithm.
H.263	ITU-T standard that provides improved compression and
	quality of video images at a line rate lower than 384 Kbps.
	This standard is not supported by all codecs.
H.264*	A proprietary Polycom Video compression standard.
H.264	ITU-T standard that provides improved compression and
	quality of video images in lower line rate connections and is
	part of the Highest Common mechanism in Video Switching
	conferences.

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