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GXV-3000 User Manual Grandstream Networks, Inc.
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and wireless local loop. The DECT Common Interface radio standard is a multicarrier time di-
vision 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 slots of
10ms, and twelve full-duplex accesses per carrier, for a total of 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 in-
formation is transmitted from the RFP within a multiframe (16 frames). Voice signals are digi-
tally encoded into a 32 Kbit/s signal using Adaptive Differential Pulse Code Modulation.
DNS
Short for Domain Name System (or Service or Server), an Internet
service that translates
domain names
into IP addresses
DID
Direct Inward Dialing
Direct Inward Dialing. The ability for an outside caller to dial to a PBX extension without go-
ing through an attendant or auto-attendant.
DSP
Digital Signal Processing. Using computers to process signals such as sound, video, and other
analog signals which have been converted to digital form.
Digital Signal Processor. A specialized CPU used for digital signal processing.
Grandstream products all have DSP chips built inside.
DTMF
Dual Tone Multi Frequency
The standard tone-pairs used on telephone terminals for dialing using 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 #).
FQDN
Fully Qualified Domain Name
A FQDN consists of a host and domain name, including top-level domain. For example,
www.grandstream.com is a fully qualified domain name. www is the host, grandstream is the
second-level domain, and com is the top level domain.
FXO
Foreign eXchange Office
An FXO device can be an analog phone, answering machine, fax, or anything that handles a
call from the telephone company like AT&T. They should also operate the same way when
connected to an FXS interface.