A SEMINAR PRESENTATION ON DSL TECHNOLOGY

Presentation OutlineINTRODUCTION OF DSL TECHNOLOGY1.Introduction to DSL

2.General Modem Connection for DSL

3.Basic Technology

4.Types of DSL

5.Application of DSL

6.Advantages of DSL

7.Disadvantages of DSL

8.ReferencesGENERAL MODEM FOR DSL CONNECTION

BASIC TECHNOLOGY(OPERATION)

INTRODUCTION DSL stands for DIGITAL SUBSCRIBER LINE. DSL is a broadband high-speed Internet technology that brings high bandwidth information to home and offices over ordinary copper telephone lines.DSL technology provides high-speed, broadband network connections to homes and small businesses.

DSL utilizes the same cabling used for normal telephones, but it can offer higher data rates through use of the digital modem technologyGENERAL MODEM FOR DSL CONNECTION

BASIC TECHNOLOGY(OPERATION)

TYPES OF DSLADSL(Asymmetric Digital Subscriber Line)

VDSL(Very high-bit-rate Digital Subscriber Line)

SDSL(Symmetric Digital Subscriber Line )

HDSL(High bit/data rate Digital Subscriber Line)

ISDN DSL(Integrated Service Digital Network)

Asymmetric Digital Subscriber Line (ADSL):

Most home and small business users typically use ADSL.

The transfer of data from the internet to PC is much faster than the transfer from PC to internet.

Downstream speeds for ADSL range from 1.59 Mbps, while upstream speeds are up to 1.5 Mbps, for a distance of 18,000 feet from the service providers premises.Working of A Simplified ADSL

Very high-bit-rate Digital Subscriber Line(VDSL):

Provides high speed internet connection but works only over a short distance.

Symmetric Digital Subscriber Line (SDSL):

Does not allows to use the phone at the same time. But internet speed of sending and receiving data is same.

High bit/data rate Digital Subscriber Line(HDSL):

HDSL was the first DSL technology that used a higher frequency spectrum of copper, twisted pair cables.

Integrated service digital network(ISDN DSL):

1.Symmetric data rates of up to 144 kbps using existing phone lines.

2.Capable of using the same modem or terminal adaptor used for ISDN and is always available.

DSL VS CABLEBoth DSL and Cable Modem technologies offer high-speed Internet access.Even though they are similar in many respects, the two technologies differ on some fundamental aspects such as:Speed:-Cable can achieve, theoretically, up to 30 Mbps, while most forms of DSL cannot reachbeyond 10 Mbps.

Bandwidth

Cable modem technology delivers shared bandwidth within theneighborhood, while DSL delivers dedicated bandwidth. DSL typically is provided in the range from 128 kbps to 1.544 Mbps, varying as the equipment.APPLICATION OF DSL1.Interactive Video movies on demand, video on demand, video conferencing.

2.High-speed Data communication Internet access, Telecommuting, Remote LAN access ,specialized network access.ADVANTAGES1.DSL service is always ON and we can still use the phone for voice calls.2.Broadband speed is much faster than dial up service.3.Fixed monthly billing , regardless of time usage.4.Digital data is directly transmitted to computer as digital data which uses much wider bandwidth for transmitting.

DISADVANTAGEDSL has one significant downside:

1.As you move away from the central office ,the connection becomes slower.

2.This results is distortion of signal.REFERENCE1.International Telecommunication Union (ITU). G.992.1 (G.dmt), G.992.2 (G.lite)standards information. http://www.itu.int

2.Standards Committee T1-Telecommunications. XDSL standards and relevant documents from T1E1.4 Working group. http://www.t1.org

3.European Telecommunications Standards Institute (ETSI). ADSL, VDSL and SDSLstandards. http://www.etsi.org

4.Internet Engineering Task Force (IETF). ADSL MIB working group.http://www.ietf.org, http://www.ietf.org/html-charters/adslmib-charter.htmlTHANK YOU