This Presentation PPt Contains all the aspect of cable internet

1. PRESENTED BY:-
Aman Kumar Singh
Ashwani Chaturvedi
CSE-3rd YEAR
G.L.B.I.T.M.
Greater Noida

2.  Introduction
 Cable Modem
 Broadband In India
 Evolution of Cable Internet
 Cable Internet Working
 About Cables Configuration
 Advantages of Cable Internet
 Disadvantages of Cable Internet
 Conclusion

3.  Internet is a networks of network(Global n/w)
 A cable modem connects to a PC using the same coaxial
cable that brings all channels to your television.
 India has a cable penetration of 80 million homes,
offering a vast network for control the internet access.
 Use the dial-up telephone services provided by your
Cable Company in conjunction with a modem.

6.  A "Cable Modem" is a device that allows high-
speed access to the Internet via a cable TV (CATV)
network.
 The cable modem attaches to computer through an
Ethernet Network Interface Card.
 It takes a signal from the computer and converts it
for transmission over the cable network.

7.  Tuner: it with the help of splitter separates Internet data fron CATV
programming, diplexer uses (40 to 850Mhz) for downstreaming and (5 to
45Mhz for upstreaming
 Demodulator : Radio-frequency to simple signal for analog to digital
converter,error correction module, network frames in MPEG format to oder
the data.
 Modulator: network signal to radio frequency, error correction info, D/A
converter, QAM.
 MAC: interface between hardware and software portions of protocols,some
tasks of MAC is passed to CPU unit

10. Coaxial cables
 Center core- material copper
 Insulating dielectric – It
separates the two conducting
wires
 Metallic shield – it provides
flexibility as well as reduce
interference
 Plastic jacket- provides cover
from external moisture

12.  Separates single high optical fibre into two cables
1. broadband cable
2. tv cable
• Splitter can also be used in the local systems
• Locally high bandwidth needed system are separated

13. Cable TV NETWORK
 Internet connection is through existing cables lines
which is done through CATV
 Cable Tv networks are of high bandwidth in range of
550Mhz to 750Mhz
 Need for setup of two way line with high frequencies
towards the subscriber
 Setup needs-
1. Cable modem
2. Cable modem termination system
3. Coaxial cables
4. Splitter

14.  Each channel of program is given 6MHz slice of bandwidth
 ISPs divide the channel into two streams for internet:
- Downstream- takes 6Mhz same as any program channel, used
use for downloading
- Upstream - takes 2Mhz as user upload less
 Stream dividing needs
- Cable modem
- Cable Modem Termination System(CTMT)

15. A cable modem termination system or CMTS is a piece
of equipment, typically located in a cable company's
headend or hubsite, which is used to provide high speed
data services, such as cable Internet or Voice over
Internet Protocol, to cable subscribers.

16.  Directs traffic from users to ISPs for connection
 At head end, cable providers lease for a third party
ISP, servers for accounting and logging
 Dynamic Host Configuration Protocol(DHCP) for
assigning and administrating all IPs of cable
system users, control servers for a protocol called
Data Over Cable Service Interface
Specifications(DOCSIS)
 Downstream data flows to every user but
upstream data is only read by CTMS others don’t
see that data, upstream bandwidth is divided by
time in millisecond

17.  DOCSIS(Data over cable Service Internet
Specification)
 Supports bidirectional 27mbps speed over
network
 Applied in datalink and network layer, few
packet collision compared to cdma-cd
 It adds IPv6 mangement

18.  Distributing IP addresses for systems
 Static allocation
 Dynamic allocation of IP address
 Maintain a tables of IP addresses for IP
allocation

19.  No dialup connection needed
 Higher speeds up to theoretical 38Mbps
 Infrastructure cost is less
 High bandwidth at low cost
 High penetration
 Doesn’t disintegrate with distance
 Performance doesn’t depend on distance
from central cable office.
 High bandwidth to low cost

20.  Shared connections – lower speeds at peak hours
 High pricing as compared to DSL networks
 Needs a better cable infrastructure in rural areas
 Traffic congestion on the net
 Higher security risk than dialup
 Always on Connectivity
 Usually tied with cable TV subscription

21. Cable TV has a strong reach to the homes and
therefore offering the Internet through cable be a
scope for furthering the growth of internet usage in
the homes.

22. THANK
YOU