Dial-up modems use phone lines to establish temporary internet connections, requiring an available phone line. Digital Subscriber Line (DSL) provides broadband internet over phone lines using modem technology, allowing simultaneous internet and phone service. Hybrid Fiber Coaxial (HFC) networks use fiber optic cables for long distances and coaxial cable for short distances, bringing fiber's benefits closer to users. Wireless networks connect devices without cables, avoiding installation costs, and use radio waves to connect laptops and other devices to the internet over various network types.

1. 1
1.1 Computer Networks

2. 2
Dial Up Modem

3. 3
Dial Up Modem
●
A connection that is established using a modem.

4. 4
Dial Up Modem
●
A connection that is established using a modem.
●
To make the dial-up connection the modem must
be connected to an active phone line that is not in
use

5. 5
Dial Up Modem
●
A connection that is established using a modem.
●
To make the dial-up connection the modem must
be connected to an active phone line that is not in
use
●
A dial - up connection is established and
maintained for a limited time duration

6. 6
Dial Up Modem
●
A connection that is established using a modem.
●
To make the dial-up connection the modem must
be connected to an active phone line that is not in
use
●
A dial - up connection is established and
maintained for a limited time duration
●
Only one service at a time i.e. Internet Surfng or
Telephone Service

7. 7
Digital Subscriber Line

8. 8
Digital Subscriber line
●
a high-speed Internet service for homes and businesses
that competes with cable and other forms of broadband
Internet.

9. 9
Digital Subscriber line
●
a high-speed Internet service for homes and businesses
that competes with cable and other forms of broadband
Internet.
●
provides high-speed networking over ordinary phone lines
using broadband modem technology.

10. 10
Digital Subscriber line
●
a high-speed Internet service for homes and businesses
that competes with cable and other forms of broadband
Internet.
●
provides high-speed networking over ordinary phone lines
using broadband modem technology.
●
technology behind DSL enables Internet and telephone
service to work over the same phone line without requiring
customers to disconnect either their voice or Internet
connections

11. 11
Digital Subscriber line
●
a high-speed Internet service for homes and businesses that
competes with cable and other forms of broadband Internet.
●
provides high-speed networking over ordinary phone lines
using broadband modem technology.
●
technology behind DSL enables Internet and telephone
service to work over the same phone line without requiring
customers to disconnect either their voice or Internet
connections
●
Two Types :
– ADSL
– DSL

12. 12
Hybrid Fiber Coaxial Cable

13. 13
Hybrid Fiber Coaxial Cable
●
a telecommunication technology in which optical fber
cable and coaxial cable are used in diferent portions of a
network to carry broadband content

14. 14
Hybrid Fiber Coaxial Cable
●
a telecommunication technology in which optical fber
cable and coaxial cable are used in diferent portions of a
network to carry broadband content
●
Fiber cable is used for Long distance connection and
Coaxial for short distance

15. 15
Hybrid Fiber Coaxial Cable
●
a telecommunication technology in which optical fber
cable and coaxial cable are used in diferent portions of a
network to carry broadband content
●
Fiber cable is used for Long distance connection and
Coaxial for short distance
●
advantage of HFC is that some of the characteristics of
fber optic cable can be brought close to the user without
having to replace the existing coaxial cable that is installed
all the way to the home and business.

16. 16
Wireless Networks

17. 17
Wireless Networks
●
are computer networks that are not connected by cables of
any kind.

18. 18
Wireless Networks
●
are computer networks that are not connected by cables of
any kind.
●
avoid the costly process of introducing cables

19. 19
Wireless Networks
●
are computer networks that are not connected by cables of
any kind.
●
avoid the costly process of introducing cables
●
use radio waves to connect devices such as laptops to the
Internet

20. 20
Wireless Networks
●
are computer networks that are not connected by cables of
any kind.
●
avoid the costly process of introducing cables
●
use radio waves to connect devices such as laptops to the
Internet
●
Types are :
– Wireless Local Area Network (WLAN)
– Wireless Metropolitan Area Networks (WMAN)
– Wireless Wide Area Networks (WWAN)
– Wireless Personal Area Networks (WPAN)

21. 21
Possible Questions
a)Describe the process used by MODEM while
transmitting signals during Dial Up Connections.
b)Write Short Notes on :
a)Dial Up Modem
b)Hybrid Fiber Coaxial Cable
c)DSL
d)Wireless Networks

22. 22
Next Lecture
Guided Media
Twisted Pair Cable
Coaxial Cable
Fiber-Optic Cable
With their Uses, Pros and Cons

23. 23
Thank You !!!