Appendix D - Glossary
Administration Manual (H.323 Version)
AT-VP504E FXO
96
Gatekeeper A gatekeeper identifies, controls, counts, and supervises the traffic or
flow through the network. It also provides functions such as terminal
and gateway registration, address resolution, band-width control, and
admission control.
Gateway A device linking two different types of networks that use different
protocols (for example, between the packet network and the Public
Switched Telephone Network).
Ground Start A way of signaling on subscriber trunks in which one side of the two
wire trunk (typically the “Ring” conductor of the Tip and Ring) is
momentarily grounded to get dialtone. There are two types of switched
trunks one can typically lease from a local phone company – ground
start and loop start. PBXs work best on ground start trunks, though
many will work – albeit intermittently – on both typed. Normal single line
phones and key systems typically work on loop start lines. Ground
Start ensures proper Far End Disconnect between an FXO port and the
SCN. See Loop Start.
H.323 An umbrella standard for audio/video conferencing over unreliable
networks; architecture and procedures are covered by this standard;
H.323 relies on H.225 and H.245.
Integrated Services
Digital Network (ISDN)
An international telecommunications network, based on a set of
communications standards, for digital transmission of voice, video, and
data over WANs. ISDN interfaces also provide LAN connections and
remote access capability. ISDN has two types of service: BRI (basic
rate interface) and PRI (primary rate interface).
International
Telecommunication
Union (ITU)
Organization based in Geneva, Switzerland, that is the most important
telecom standards-setting body in the world.
Internet Protocol (IP) A standard describing software that keeps track of the Internet’s
addresses for different nodes, routes outgoing messages, and
recognises incoming messages.
Summary of Contents for AT-VP504E FXS
Page 1: ...AT VP504E FXO H 323 Administration Manual PN 990 11592 10 Rev C VoIPTalk...
Page 16: ...Chapter 1 Introducing the AT VP504E FXO Administration Manual H 323 Version AT VP504E FXO 8...
Page 76: ...Chapter 5 Software Upgrade Administration Manual H 323 Version AT VP504E FXO 68...
Page 100: ...Appendix C Gatekeeper Registration Logic Administration Manual H 323 Version AT VP504E FXO 92...
Page 112: ...Index Administration Manual H 323 Version AT VP504E FXO 104...