Glossary Of Terms - Grandstream Networks HandyTone-286 User Manual

HandyTone -286 User Manual
ADSL
Asymmetric Digital Subscriber Line: Modems attached to twisted pair copper wiring that
transmit from 1.5 Mbps to 9 Mbps downstream (to the subscriber) and from 16 kbps to 800
kbps upstream, depending on line distance.
AGC
Automatic Gain Control, is an
to control the
changing range of real world conditions.
ARP
Address Resolution Protocol is a protocol used by the
pecifically IPv4, to map
protocol. The protocol operates below the network layer as a part of the interface between the
OSI network and OSI link layer. It is used when
ATA
Analogue Telephone Adapter. Covert analogue telephone to be used in data network for VoIP,
like Grandstream HT series products.
CODEC
Abbreviation for Coder-Decoder. It's an analog-to-digital (A/D) and digital-to-analog (D/A)
converter for translating the signals from the outside world to digital, and back again.
CNG
Comfort Noise Generator, geneate artificial background
communications to fill the
DATAGRAM
A data packet carrying its own address information so it can be independently routed from its
source to the destination computer
DECIMATE
To discard portions of a signal in order to reduce the amount of information to be encoded or
compressed. Lossy compression algorithms ordinarily decimate while subsampling.
DECT
Digital Enhanced Cordless Telecommunications: A standard developed by the European
Telecommunication Standard Institute from 1988, governing pan-European digital mobile
telephony. DECT covers wireless PBXs, telepoint, residential cordless telephones, wireless
access to the public switched telephone network, Closed User Groups (CUGs), Local Area
9

Glossary of Terms

electronic system
gain of a system in order to maintain some measure of performance over a
IP network addresses
silent time in a transmission resulting from
Grandstream Networks, Inc
found in many types of devices. Its purpose is
Internet Protocol (IP)
to the hardware addresses used by a data link
IPv4 is used over Ethernet
noise used in
35
[RFC826],
radio and wireless
voice activity detection.
.