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COMPUTER NETWORKING 2 LECTURE 5: CABLE MODEMS Cable Modems.

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Presentation on theme: "COMPUTER NETWORKING 2 LECTURE 5: CABLE MODEMS Cable Modems."— Presentation transcript:

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2 COMPUTER NETWORKING 2 LECTURE 5: CABLE MODEMS

3 Cable Modems

4 What are Cable Modems?  The cable TV plant dedicates a standard cable TV channel to data transfer for Internet and multimedia services.  A computer equipped with a cable modem is then connected to the cable TV network using the same type of hook-up used for a television.  Once connected, the cable modem tunes to the channel set aside for data transfer to access the Internet.

5 How Fast are Cable Modems?  Phone Modem connection is about 50 kbit/s and is used point-to-point.  EtherNet (LAN) connection is 10 Mbit/s or 100Mbit/s and is used to connect many computers that can “talk” directly to each other.  Cable Modem connection is something in between. Speed is typically 3-50 Mbit/s and the distance can be 100 km or more.

6 How Fast are Cable Modems?  the speed of the cable modem depends on a few things. First it depends on how many users are on the system since the cable technology is a "shared" bandwidth. Too many users using too much throughput can drain this “shared” technology. bandwidth  The second factor to cable modem speed is a limit on the cable modem itself. Some cable providers will limit the upload or download speed on the cable modem, and this could affect your connection speed

7 How Do Cable Modems Work?  Cable modems receive digital information carried over the cable TV network and passes it through to the computer via a standard 10BaseT Ethernet interface.

8 Cable Modem Connection

9 How secure is a Cable Modem?  Cable connections are not 100% secure in any instance like many other connections on the Internet.  A general rule is to keep passwords long and turn off any service that you don't absolutely need running.  A firewall type application should be used to keep a network as secure as possible.

10 Cable Modems vs. ADSL  There is one major advantage that ADSL has over cable modems. Cable modems use a shared networking technology where all the cable modems share a single pipe to the Internet. This pipe speed will fluctuate depending on the number of subscribers on the network.  When ADSL is used, the pipe to the Internet is solely "yours", and is not shared along the way to a central office. This allows for a more consistent speed, and this speed does not typically fluctuate like cable modem networks.

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