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Access Network (Fixed Access Network (Fixed Line)Line)

Access Network ArchitectureAccess Network Architecture ADSL protocolADSL protocol Modem InstallationModem Installation Issues relating to DSL serviceIssues relating to DSL service

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DSLAM

ATM Link

MDF Switch

Cable Chamber

Cabinet

Primary cable

DP

Secondary cable

SDH Transmission

Network

ATM Switch

Router

AAA

DHCP

DNS

ITI Router

OLT

ONU ONU

ONU

DP

Secondary cable

Proxy

Splitter

Drop wire

ExchangeAccess Network

ISP

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ADSL stands for Asymmetric Digital ADSL stands for Asymmetric Digital Subscriber LineSubscriber Line Downlink rate (8MBps) Downlink rate (8MBps) > Uplink (128 > Uplink (128

to 768KBps)to 768KBps) QPSK is used upto 1Mbps and 128 PAM QPSK is used upto 1Mbps and 128 PAM

in VDSL for 56 Mbpsin VDSL for 56 Mbps The downstream rate is often up to The downstream rate is often up to

10 times faster than the upstream 10 times faster than the upstream rate.rate.

ADSLADSL

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• The data rate of ADSL is highly dependent upon the distance from the Central Office (CO) to the Consumer Premises (CPE). •At a distance of 2.5 km, 8 Mbps downstream can be achieved while at 5 km, only 1.544 Mbps downstream can be achieved. VDSL can only transmit upto 1.5 Km.

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ADSL is well suited to residential ADSL is well suited to residential applications. It uses lines that are already applications. It uses lines that are already installed virtually everywhere and peacefully installed virtually everywhere and peacefully coexists with current phone service. coexists with current phone service.

ADSL is ideal for most home computing and ADSL is ideal for most home computing and small business applications because of the small business applications because of the large downstream data capacity (up to 8 large downstream data capacity (up to 8 Mbps). Mbps).

Voice and Data service can work at the same Voice and Data service can work at the same timetime

Advantages of ADSLAdvantages of ADSL

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How to Setup a modemHow to Setup a modem

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Lights on the RouterLights on the Router PowerPower DSL DSL

If light is constant then the router is in sync with If light is constant then the router is in sync with the DSLAM.the DSLAM.

Blinking light generally signifies problem in the Blinking light generally signifies problem in the copper paircopper pair

If voice is working then attenuation has increasedIf voice is working then attenuation has increased Line may be breakup somewhereLine may be breakup somewhere

InternetInternet Session hang at service provider’s backendSession hang at service provider’s backend Modem overheatModem overheat DNS, Gateway, BRAS, PIEDNS, Gateway, BRAS, PIE

LANLAN

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Issues relating to DSL Issues relating to DSL serviceservice

SpeedSpeed Speed is in Kbps whereas download is in KBpsSpeed is in Kbps whereas download is in KBps Shared not dedicated bandwidth Not Shared not dedicated bandwidth Not

configured at Backendconfigured at Backend Increase in attenuationIncrease in attenuation Virus in Windows, browser problems Virus in Windows, browser problems

Relating Access NetworksRelating Access Networks Relating to the VendorRelating to the Vendor Relating to the EnvironmentRelating to the Environment Relating to the subscribersRelating to the subscribers

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Relating to PaknetRelating to Paknet If internet service of other ISPs workingIf internet service of other ISPs working

Relating to ITI (PIE)Relating to ITI (PIE) All ISPs sufferAll ISPs suffer DOS attackDOS attack

Relating to TransmissionRelating to Transmission Construction activities lead to breakup in the Construction activities lead to breakup in the

media OFAN,media OFAN, ISP to ITI fiber connectionISP to ITI fiber connection SEMEWEA breakupSEMEWEA breakup

Issues relating to DSL Issues relating to DSL serviceservice

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Self DiagnoseSelf Diagnose PingPing TracertTracert

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THANKYOUTHANKYOU

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