Allied Telesis AT-VP504E FXS (H.323) User Manual
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Appendix A - Glossary
Administration Manual (H.323 Version)
AT-VP504E FXS
17
G
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 that links two different types of networks that use different
protocols (for example, between the packet network and the Public
Switched Telephone Network).
H
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.
I
Internet Protocol (IP)
The IP protocol is a standard describing software that keeps track of
the Internet’s addresses for different nodes, routes outgoing messages,
and recognises incoming messages.
L
Light Emitting Diode (LED)
A semiconductor diode that emits light when a current is passed
through it.
Local Area Network (LAN)
Data-only communications network confined to a limited geographic
area, with moderate to high data rates. Contrast with WAN.