Network Communications Chapter 7 Modems, DSL, Cable Modems and ISDN.

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Presentation transcript:

Network Communications Chapter 7 Modems, DSL, Cable Modems and ISDN

Public Switched Telephone Network (PSTN) Figure 7.1 Signal PSTN Public Switch Telephone Network

Telephone Carrier Signal (Sine Wave) Voltage Degree Figure 7.2

Amplitude Shift Keying (ASK) Figure 7.3

Frequency Shift Keying (FSK) Figure 7.4

90 Degree Phase Shift Figure Cycle Original Signal A sine wave 90 degree phase shift A cosine wave 1 cycle

Phase Shifting the Carrier Figure 7.6 Note: Error in text a. 90 degree shiftb. 180 degree shiftc. 270 degree shift

Constellation Diagrams Figure 7.7 QPSK Figure PSK Bits Phase Shift Bits Phase Shift

8 – QAM Modulation Figure 7.9Figure 7.10

56 Kb/sec Modem Connection Figure 7.11

ADSL Modem Asymmetric Digital Subscriber Line Figure 7.12Figure 7.13

ADSL Modem Architecture Figure 7.14 ADSL Modem POTS Mbps kbps Filter POTS Line Exchange Switch POTS Filter ADSL Modem Mbps Kbps Customer End POTs filters do not operate on the DSL signal!

Cable TV Distribution Figure 7.15

Hybrid Fiber Coax (HFC) Figure 7.16

A Cable Modem Connection Figure 7.17

Sharing a Cable/DSL Modem Figure 7.18 Should be a Router and a Hub / Switch

ISDN Basic Rate 2B + D: 144 Kb/sec Figure 7.19

Using the Basic Rate Interface 2 wires Figure 7.20

ISDN Primary Rate 23B + D (T1) Figure Figure 7.22

ISDN PRI Application Figure 7.23