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Modems Mostly used to connect PCs to the Internet Modulates and demodulates the signal Converts analog data into digital and vice versa V.90/V.92 56K standards.

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Presentation on theme: "Modems Mostly used to connect PCs to the Internet Modulates and demodulates the signal Converts analog data into digital and vice versa V.90/V.92 56K standards."— Presentation transcript:

1 Modems Mostly used to connect PCs to the Internet Modulates and demodulates the signal Converts analog data into digital and vice versa V.90/V.92 56K standards are the most popular today Internal and external models Industry standard use to be “Hayes Compatible.” The term is out of favor.

2 Baud Vs BPS (Bits Per Second) Baud The rate at which a signal changes frequency per second Measurement of signaling rate, not data transfer BPS Measures the amount of data sent per second Multiple bits can be sent with one baud

3 ISDN (Integrated Services Digital Network) No modulation or demodulation necessary ISDN modem is not a modem, but a terminal device Speeds of up to 128 Kbps Growing in popularity and availability

4 ISDN Services Available BRI (Basic Rate Interface) Aimed towards home users Uses two B channels and one D for a total of 128Kbps PRI (Primary Rate Interface) Aimed towards businesses Uses up to 23 B channels and one D for a total of 1984Kbps

5 Cable Modems and DSL Competitors Cable Modems use the television cable: the cable provider becomes the ISP. DSL uses traditional phone lines. What are the similarities? What is/are the difference(s)?

6 Figure 9-5 DSL Architecture Local Carrier End Office Line Splitter Customer Premises Telephone DSL Modem Hub Computer Local Loop Main Distribution Frame Customer Premises Customer Premises Voice Telephone Network DSL Access Multiplexer ATM Switch ISP POP

7 Figure 9-8 Cable Modem Architecture Cable Company Distribution Hub Cable Splitter Customer Premises TV Cable Modem Hub Computer Shared Coax Cable System Combiner Customer Premises Customer Premises TV Video Network Cable Modem Termination System ISP POP Cable Company Fiber Node Optical/Electrical Converter Downstream Upstream Router Cable Company Fiber Node

8 Other Fixed-base Wireless Broadband Satellite

9 Leased Line Services Permanent 24 hour dedicated connection T1 Up to 24 64 Kbps lines for a total of 1.55 Mbps Can lease one or multiple channels (Fractional T1) T3 45 Mbps (roughly 30 T1 lines) Commonly used as backbones on the Internet

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