This presentation discusses software modems. It introduces modems and their functions, including modulating and demodulating analog signals to encode and decode digital data. It describes how software modems use frequency-shift keying and connect to phone lines. The presentation covers the types of modems, their system architecture with interrupt handlers, methods for system integration and testing, examples of cable modems, and advantages like upgradability and portability and disadvantages like slowing host computers.

1. Software Modem
PRESENTED BY
K . KALAIYARASAN
ECE- FINAL YEAR
HSIEC

2. In this presentation:-
 Introduction
 Connection of modem
 Operation and requirement
 Circuit diagram
 Types of modem
 Tabulation
 System architecture
 System integration
 Advantage
 Disadvantage

3. Introduction:-
 A modem (modulator-demodulator) is a device
that modulators an analog carrier signal to
encode digital information , and also
demodulates such a carrier signal to decode the
transmitted information.
 The goal to produce a signal that can be
transmitted easily and decode to reproduce the
original digital data.
 Modems can be used over any means of
transmitting analog signals, from light emitting
diode to ratio.

4. Connection of modem:-

5. Operation and Requirements:-
 Soft modem will use frequency shift keying(FSK)
technique and it is used in 1200 baud modems.
 The FSK scheme transmits sinusoidal tones with
0 and 1assigned to different frequencies.
 Sinusoidal tones are much better suited to
transmission over analog phone lines.
 The 01 bit patterns create the chirping sound
characteristics. of modem

7. Types of modems:-
 External modem
 Internal modem
 Standard modems
 Intelligent modems
 Short –Haul modems
 Wireless modems

9. System Architecture:-
 The modem consist of two different kinds of
subsystems such us
 1.One small subsystem
 2.Two major subsystem
 Small subsystem used for interrupt handlers and
one interrupt handlers for input and another
interrupt for output.

10. System integration:-
 Modem can be tested in two ways such as
 1. By having the modems transmitter send bits to
its receiver.
 2. By connecting two different modems.

11. Best cable modem:-
 D link DIR 600 mn150
 Link system cm3008
 Arris surface band S06183

12. Advantages :-
 It can be easily upgradable of newer modem.
 It is less cost and less weight.
 Low power consumption.
 It can be used as a portable modem in laptops
and telephone

13. Disadvantages :-
 In certain stage of usage it will slow down their
host computer systems.
 They cannot used by on other operating system.
 They consume some CPU cycle on the computer
to which