The document discusses different types of modems and digital subscriber line (DSL) technologies. It defines what a modem is, including that it modulates and demodulates digital and analog signals to allow computers to communicate over phone lines. It then describes DSL technology, how it uses existing phone lines to provide high-speed internet access. Finally, it focuses on asymmetric DSL (ADSL), explaining how ADSL works using an ADSL modem, splitter, and other components to transmit data faster downstream than upstream over phone lines while still allowing phone use.

1. Name: Ruparel JayName: Ruparel Jay
Enr_no: 146020307546Enr_no: 146020307546

2.  Modem Technologies.
 What does modem mean?
 DSL Modem
 Advantages of DSL
 ADSL Modem
 How ADSL work?
 Advantages of ADSL

3.  The word "modem" comes from
"modulator-demodulator“
 Modulation: digital information to
analog signals
 Demodulation: analog signals back
into useful digital information
 Allows 2 computers to communicate
over standard phone lines.
 They have many different shapes
and sizes to correspond all kind of
needs.

5.  Digital Subscriber Line.
 New modem technology.
 Data transmission is based on digital encoding (digital).
 Uses phone line so for the customer wiring (subscribers’ line).
 Use digital coding techniques to provide more capacity.
 Allows high-speed Internet access over existing twisted-pair
and ordinary copper telephone wires.

6.  Provides "always-on" connection.
 To transport high-bandwidth data.
 A special hardware attached to both the user and switch ends of
line.

7.  High-speed.
 Secure connection.
 No dial-up, waiting or dropped connections.
 It's always on connection.
 Saves both money and time.
 Provides large file transfers.
 Multiple workers on a network can connect to a single
DSL.

8.  Asymmetric Digital Subscriber Line.
 Is a form of DSL.
 A high-speed Internet access service.
 Speed depends on the length and the diameter of the
cable and the type of the mode
 Requires a special ADSL modem and an Internet
service provider (ISP) .

9.  It is asymmetric since the data coming to your computer from
the Internet (download) is faster than the data traveling from
your computer to the Internet (upload).
 Uses standard telephone lines.
 Telephone can be used normally, even when surfing in the
Web with ADSL service.
 An "always on" service.
 Not available to everyone.

10.  ADSL Splitter separates the analogue voice (phone)
traffic from data (adsl) traffic.
 ADSL Modem converts digital signals from your PC
into analog signals that can be transmitted over
telephone cable in the local loop.
 Local Loop is the path your telephone line will take
from your house to the local exchange.
 Service Provider.
 The cable consists of a "copper pair" .

14.  Quick connection.
 Fast.
 Use phone connection when connected to the internet.
 No need for second phone line.
 No dropped connections.
 Always on connection.
 Ability to download large files.
 Save time.
 Cost efficiency.

15. QUESTIONS?