DSL is a technology that provides high-speed internet access over traditional phone lines. There are two main types: asymmetric DSL (ADSL), which provides more bandwidth for downloading, and symmetric DSL (SDSL), which provides equal bandwidth for both uploads and downloads. A DSL modem is required for the customer to connect to their internet provider, who uses equipment called a DSLAM. DSL allows voice and internet access to work simultaneously over the same phone line. It is widely used globally and supports applications like online gaming, video streaming, and telecommuting.

1. DIGITAL SUBSCRIBER LINE
Prepared by:
Ebrahim Mohammed Abdo
M031220004

2. Definition
 DSL is a high-speed Internet service like cable
Internet.
 DSL provides high-speed networking over
ordinary phone lines using broadband
modem technology.
 DSL technology allows Internet and telephone
service to work over the same phone line without
requiring customers to disconnect either their
voice or Internet connections.
 DSL Internet services are used primarily in homes

3. DSL Modem

4. What Are the Different Types of DSL
Technology?
 All types of DSL Internet service can be categorized as :
 Asymmetric DSL ( ADSL) : provide more network
bandwidth for downloading than for uploading. By reducing
upstream bandwidth, service providers are able to offer
more bandwidth downstream.
 Asymmetric DSL technology is designed for residential
users; it is not suitable for businesses.
 Symmetric DSL (SDSL): provide equal bandwidth for both
uploads and downloads.
 Symmetric DSL technology is popular for business-class
DSL services as companies often have greater needs for
transferring data.

5. Figure 9.11 Bandwidth division in ADSL
9.5

6. Equipment
 On the side of the customer is a DSL
modem required.
 splitter is needed to separate phone line with
DSL line.
 On the side of the provider of the line is
a DSLAM equipped.

7. Figure 9.12 ADSL modem
9.7

8. DSL Applications
 Internet Access & File Sharing
 Video
o
o
o
Broadcast TV
Video On Demand
User generated video
 Telecommuting
 Online Education & Shopping
 Online Gaming

9. Market Status of DSL Technology
 DSL is the #1 Broadband Choice in the World
with over 65% market share and more than
200 million users
 DSL is available in every region of the world,
and ADSL owns the majority of the market.
 DSL is capable of providing up to 100 Mbp,
and supports voice, video and data.

10. Table 9.2 Summary of DSL technologies
9.10