Thise presentation was software modem working mechanism.

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