D-Link DSL-520B User Manual

50D-Link DSL-520B ADSL2+ Modem User Manual
Section 9 - Advanced Setup
Quality of Service
Manycommunicationandmultimediaapplicationsrequirelarge,high-speedbandwidthstotransferdatabetweenthelocalnetworkandtheinternet.
However,formanyapplicationsthereisoftenonlyoneinternetconnectionavailablewithlimitedcapacity.QoSdividesthiscapacitybetweenthe
dierentapplicationsandprovidesundelayed,continuousdatatransferinsituationswheredatapacketswithhigherpriorityaregivenpreference.
Click Quality of Serviceandthefollowingpagewillappear.UnderQualityofService,therearetwonetworksharemodes:QueueCongandQoS
Classication.
NetworkQoSisanindustry-widesetofstandardsandmechanismsforensuringhigh-qualityperformanceforcriticalapplications.ByusingQoS
mechanisms,networkadministratorscanuseexistingresourcesecientlyandensuretherequiredlevelofservicewithoutreactivelyexpanding
or over-provisioning their networks.
Traditionally,theconceptofqualityinnetworksmeantthatallnetworktracwastreatedequally.Theresultwasthatallnetworktracreceived
thenetwork’sbesteort,withnoguaranteesforreliability,delay,variationindelay,orotherperformancecharacteristics.Withbest-eortdelivery
service,however,asinglebandwidth-intensiveapplicationcanresultinpoororunacceptableperformanceforallapplications.TheQoSconcept
ofqualityisoneinwhichtherequirementsofsomeapplicationsandusersaremorecriticalthanothers,whichmeansthatsometracneeds
preferential treatment.

D-Link DSL-520B Specifications

Data Transfer Rates

G.dmt full rate downstream	up to 8 Mbps
G.dmt full rate upstream	up to 1 Mbps
G.lite downstream	up to 1.5 Mbps
G.lite upstream	up to 512 Kbps
G.dmt.bis full rate downstream	up to 12 Mbps
G.dmt.bis full rate upstream	up to 12 Mbps
ADSL full rate downstream	up to 24 Mbps
ADSL full rate upstream	up to 1 Mbps

Interfaces

ADSL interface	RJ-11 connector
LAN interface	RJ-45 port
Ethernet	10/100BASE-T