Glossary Of Terms - Grandstream Networks GXW-410x User Manual

G
LOSSARY OF
ADSL Asymmetric Digital Subscriber Line: Modems attached to twisted pair copper wiring that transmit
from 1.5 Mbps
dependin g on lin
AGC Automatic Gain Control is an
control the gain
real world c ondit
ARP Address Resolution Protocol is a protocol
IPv4, to map
operates below the network la
is used when
ATA Ana logue Telephone A
Grandstream HT series products.
CODEC Abbreviation for
converter for translating th
CNG Comfort Noise Generator, generate 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 porti
c ompressed. Lossy compression algorithms ordinarily decimate while sub-sampling.
DECT Digital Enhanced Cordless Telecommunications: A standard developed by the European
Telecommunication S
D ECT covers wireless PBXs, telepoint, residential cordless telephones, wireless access to the public
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 f 120 possible combinations. A DECT base station (an RFP, Radio Fixed Part) can transmit all 12
possible accesses (time slots) simultaneously by using different frequencies or using only one frequency.
All signaling information is transm
d igitally encoded into a 32 Kbit/s signal using Adaptive Differential Pulse Code Modulation.
DNS Short for Domain Name System (or Service or Server), an
names into IP addresses
DID Direct Inward Dialing. The ability for an outside caller to dial to a PBX extension w
th rough an attendant or auto-attendant.
DSP Digital Signal Processor. A sp
p roducts all have DSP chips built inside.
DTMF Dual Tone Multi Frequency. The standard tone-pairs used on telephone termi
u sing in-band signaling. The standards define 16 tone-pairs (0-9, #, * and A-F) although most terminals
support only 12 of them (0-9, * and #).
Grandstream Networks, Inc.
VoIPon www.voipon.co.uk
T
ERMS
to 9 Mbps downstream (to
e distance.
electronic
of a system in order to maintain some measure of performance over
ions.
IP network addresses to the hardwa
yer as a part of the interface between the OSI network and OSI link layer. It
IPv4 is used over Ethernet
dapter. Covert analogue telephone to be used in data network for VoIP, like
Coder-Decoder. It's an analog-to-digital (A/D) and digital-to-analog (D/A)
e signals from the outside world to digital, and back again.
silent time in a transmission resulting from
ons of a signal in order to reduce the amount of information to be encoded or
tandard Institute from 1988, governing pan-European digital mobile telephony.
itted from the RFP within a multi-frame (16 frames). Voice signals are
ecialized CPU used for digital signal processing. Grandstream
sales@voipon.co.uk
the sub scriber) and from 16 kbps to 8
system found in many types of devices. Its purpose is to
used by the Internet Protocol (IP)
re addr esses used by a data link protocol. The protocol
s of 10ms, and twelve full-duplex accesses per carrier, for a total
Internet
GXW-410x User Manual
Firmware 1.0.0.53
Tel: +44 (0)1245 808195
00 kb ps upstream,
a ch anging range of
[RFC826], specifically
noise used in radio and
voice activity detection.
service that translates
ithout going
nals for dialing
Page 34 of 37
Updated: 04/2007
Fax: +44 (0)1245 600030
wireless
domain