PRESENTED BY:-Aman Kumar SinghAshwani Chaturvedi

CSE-3rd YEARG.L.B.I.T.M.

Greater Noida

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

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.

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.

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 oderthe data.

Modulator: network signal to radio frequency, error correction info, D/A converter, QAM.

MAC: interface between hardware and software portions of protocols,sometasks of MAC is passed to CPU unit

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

Separates single high optical fibre into two cables1. broadband cable 2. tv cable

• Splitter can also be used in the local systems • Locally high bandwidth needed system are separated

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

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)

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.

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

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

Distributing IP addresses for systems

Static allocation

Dynamic allocation of IP address

Maintain a tables of IP addresses for IP allocation

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

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

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.

THANKYOU