Internet Architecture & Protocol DSL & its Flavors

Today’s Agenda Intro to DSL How DSL Works Types of DSL DSL CPE DSLAM B-RAS DSL Modem Configurations Troubleshooting of DSL Modem DSL Service Providers in World

Digital Subscriber Lope DSL Digital Subscriber Lope Allow transmission of information over existing copper lines PSTN Network ISDN Network DSL over PSTN Always Connected High Bandwidth Fast Speed Voice, Video & Data Transmission

DSL Digital Data Transmission High Speed Network Voice, Video and Data Communication Benefit of 25Khz Above Frequency of PSTN Upstream & Downstream Channels Traditional PSTN Infrastructure dependent

Digital Subscriber Lope Network Existence DSL Digital Subscriber Lope Network Existence

How DSL works ? DSL Modulation Guard Band

ADSL1 and ADSL2 = 256 Sub-Channels DSL Modulation / DMT Discrete Multitone Method of Conversion Digital data into Frequencies Splits value of frequencies into smaller sub-channels Method of Frequency Division Multiplexing ADSL1 and ADSL2 = 256 Sub-Channels ADSL2+ = 512 Sub-Channels

How DSL works ? ADSL - DMT

How DSL works ? DSL Versions and Comparison ADSL Type ADSL Standard Speed Up to Maximum Frequency Upstream Start Upstream Tones Downstream Start Downstream Tones Total BINs   ADSL 1 G.992.1 8 Mbps 1.1 MHz 25 kHz 6-31 142.3 kHz 33-255 256 ADSL 2 G.992.3 12 Mbps ADSL 2+ G.992.5 24 Mbps 2.2 MHz 33-511 512

How DSL works ? ADSL Versions and Comparison

Digital Subscriber Lope Network Existence DSL Digital Subscriber Lope Network Existence

Customer Premises Equipment DSL CPE Customer Premises Equipment Customer Side Device Sync with the DSLAM Connect with the RAS for Internet Services Username / Password

Customer Premises Equipment DSL CPE Customer Premises Equipment

Customer Premises Equipment DSL CPE Customer Premises Equipment

ADSL Values for Better Performance DSL CPE ADSL Values for Better Performance Faculty of Information Technology | SABAC

SNR Margin Signal to Noise Ratio SNR = Signal Value / Noise Value High SNR = Stable Connection & Less Errors 6dB. or below = Bad and will experience no line synchronization and frequent disconnections 7dB-10dB. = Fair but does not leave much room for variances in conditions. 11dB-20dB. = Good with little or no disconnection problems 20dB-28dB. = Excellent 29dB. or above = Outstanding

Loss of Signal over Distance Line Attenuation Loss of Signal over Distance Distance Cabling Joints PSTN Network 20bB. and below = Outstanding 20dB-30dB. = Excellent 30dB-40dB. = Very Good 40dB-50dB. = Good 50dB-60dB. = Poor and may experience connectivity issues 60dB. and above = Bad and will experience connectivity issues

DSL Service Commissioning DSL Line Quality / LOPE Test

How DSL works ? DSL Network

ADSL Asymmetrical Digital Subscriber Line SDSL Symmetrical Digital Subscriber Line RADSL Rate Adaptive Asymmetrical Digital Subscriber Line HDSL High Bit Rate Digital Subscriber Line VDSL Very High Bit Rate Digital Subscriber Line G.SHDSL Single Line High Bit Rate Digital Subscriber Line

ADVANTAGES The primary advantage of DSL is the speed. Independent service Customers have dedicated lines. Good for "burst" traffic patterns. Always On Does not require new wiring DSL available in multiple speeds to meet your requirement Offers simultaneous data and voice capability DISADVANTAGES Not available for everyone. Difficult to install Expensive Distance dependence

Summary Intro to DSL How DSL Works Types of DSL DSL CPE DSLAM B-RAS DSL Modem Configurations Troubleshooting of DSL Modem DSL Service Providers in World

Recommended Reading Search Google for “ADSL”

Assignment - 1 Design a fully functional ADSL Setup from user to ISP Including Home PC ADSL Modem PSTN Exchange DSLAM RAS Internet Cloud Explain Diagram in Bullets as Well