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GLOSSARY OF TERMS
ADSL Asymmetric Digital Subscriber Line: Modems attached to twisted pair copper wiring that transmit
from 1.5 to 9 Mbps downstream (to scriber) and from 16 kbps to 8 ps upstream,
dependin e distance.
AGC Automatic Gain Control is an
electronic
Mbps the sub 00 kb
g on lin
system found in many types of devices. Its purpose is to
control the
gain of a system in order to maintain some measure of performance over anging range of
real world c ions.
ARP Address Resolution Protocol is a protocol the
Internet Protocol (IP)
a ch
ondit
used by
[RFC826], specifically
IPv4, to map
IP network addresses to
yer as a
the hardwa esses used by a data link protocol. The protocol
operates below the network la part of the interface between the OSI network and OSI link layer. It
is used when
IPv4 is used over Ethernet
re addr
ATA Ana dapter. Covert analogue telephone to be used in data network for VoIP, like
Grandstream HT series products.
CODEC Coder-Decoder. It's an analog-to-digital (A/D) and digital-to-analog (D/A)
converter e signals from the outside world to digital, and back again.
CNG Comfort Noise Generator, generate artificial background
noise
logue Telephone A
Abbreviation for
for translating th
used in radio and wireless
communications to fill the
silent time in a transmission resulting from voice activity detection.
DATAGRAM A data packet carrying its own address information so it can be independently routed from
ons of a signal in order to reduce the amount of information to be encoded or
ompressed. Lossy compression algorithms ordinarily decimate while sub-sampling.
tandard Institute from 1988, governing pan-European digital mobile telephony.
ECT covers wireless PBXs, telepoint, residential cordless telephones, wireless access to the public
s of 10ms, and twelve full-duplex accesses per carrier, for a total
f 120 possible combinations. A DECT base station (an RFP, Radio Fixed Part) can transmit all 12
itted from the RFP within a multi-frame (16 frames). Voice signals are
igitally encoded into a 32 Kbit/s signal using Adaptive Differential Pulse Code Modulation.
its source to the destination computer
DECIMATE To discard porti
c
DECT Digital Enhanced Cordless Telecommunications: A standard developed by the European
Telecommunication S
D
switched telephone network, Closed User Groups (CUGs), Local Area Networks, and wireless local loop.
The DECT Common Interface radio standard is a multi-carrier time division multiple access, time division
duplex (MC-TDMA-TDD) radio transmission technique using ten radio frequency channels from 1880 to
1930 MHz, each divided into 24 time slot
o
possible accesses (time slots) simultaneously by using different frequencies or using only one frequency.
All signaling information is transm
d
DNS Short for Domain Name System (or Service or Server), an
Internet service that translates domain
names into IP addresses
ithout going
rough an attendant or auto-attendant.
ecialized CPU used for digital signal processing. Grandstream
roducts all have DSP chips built inside.
nals for dialing
sing in-band signaling. The standards define 16 tone-pairs (0-9, #, * and A-F) although most terminals
DID Direct Inward Dialing. The ability for an outside caller to dial to a PBX extension w
th
DSP Digital Signal Processor. A sp
p
DTMF Dual Tone Multi Frequency. The standard tone-pairs used on telephone termi
u
support only 12 of them (0-9, * and #).
Grandstream Networks, Inc. GXW-410x User Manual Page 34 of 37
Firmware 1.0.0.53 Updated: 04/2007