A program to tell the system software how to work with that place of hardware

1. www.oeclib.in
Submitted By:
Odisha Electronics Control Library
Seminar
On
Computer Peripheral

2. Content
 Device Drivers
 Plug-n-Play Devices
 Input Devices
 Output Devices
 Storage Devices
 Network Devices
 Communication Device
 References

3. Device Drivers
 A program to tell the system software how to
work with that piece of hardware
 Some common device drivers are built in the
system software (Operating System) e.g.
keyboard and mouse drives

4. Plug-n-Play Devices
 Devices designed such that Windows can
detect them, install and configure the device
driver automatically
 For non plug-n-play devices, we have to install
and configure the device driver manually.

5. Input Devices (1)
 Keyboard
 P/S2 keyboard
 USB keyboard
 Wireless keyboard

6. Input Devices (2)
 Pointing Devices
 Mouse, trackball, touch pad, light pen, digitizer
 Touch screen

7. Input Devices (3)
 Scanning devices
 Image scanner
 Fax machine – scan image to bitmap
 Bar code scanner – scan Universal Product Code
(UPC)
 Magnetic ink character scanner (MICR)
 Optical character scanner (OCR)
 Optical mark scanner (OMR)

8. Input Devices (4)
 Voice Input Device
 Microphone – to receive the sound signal
 Sound card – to convert the sound signal to digital
form
 Use speech recognition software to recognize
human speech

9. Input Devices (5)
 Handwriting Recognition Device
 Need handwriting recognition software
 Called natural input
 Slow inputting speed

10. Output Devices (1)
 Visual Display Unit (VDU)
 Commonly called monitor
 2 common types of monitor
 CRT (Cathode Ray Tube) monitor
 High radiation and bulky
 LCD (Liquid Crystal Display) monitor
 No radiation and slim

11. Output Devices (2)
 Printer – to produce hard copy
 Laser printer
 to produce high quality output
 resolution up to 2400 dpi (dot per inch)
 use carbon toner, usually for black and white
printout, colour is very expensive

12. Output Devices (3)
 Inkjet printer
 produce good quality colour output
 resolution up to 1440 dpi
 use ink droplets to compose the image
 The printer is much cheaper than laser printer but
the ink is very expensive

13. Output Devices (4)
 Dot matrix printer
 Use impact principle
 Can print multiple (carbon) copies at a time,
usually use in printing invoices
 The ink ribbon is cheap
 Poor quality of printout

14. Output Devices (5)
 Plotter
 Drawing high quality image, use colour pens, can
draw smooth curves
 Can print on large paper size, use roll of paper
 To draw posters and maps
 Use in CAD (Computer Aided Design)

15. Output Device (6)
 Voice output devices
 Sound card, to convert computer signals to sound
 Speakers, to amplify the sound output

16. Storage Devices (1)
 Floppy Disk (Diskette)
 A flexible plastic circular disc
 Packed in a plastic square jacket
 Formatted to 1.44MB
 Divided to many circular tracks
 Each track is divided to many sectors
 Use magnetic technology to store data ‘0’ or ‘1’
 Random access
 Slow accessing speed

17. Storage Devices (2)
 Hard Disk
 High storage capacity, over 100 GB
 Hard metallic surface
 Consists of several metallic disks
 Data are stored in cylinder (a deck of tracks)
(see p.86)
 Use magnetic technology
 Very high access speed
 Random access

18. Storage Device (3)
 Optical disk
 CDROM, DVDROM, CDRW, DVDRW
 Use optical technology, laser reflection on pits
 ‘1’ will reflect the laser beam while ‘0’ does not
 High storage capacity, 700 MB for a CDROM,
17GB for a DVDROM
 Random access
 High access speed

19. Storage Device (4)
 Tape
 Cheap
 Sequential access
 Use magnetic technology
 Ideal for backup data, we need to backup and restore all data
 High storage capacity
 Slow access speed
 Group of records are stored in a block
 Inter-block gaps are needed for stopping and starting the
read/write head.

20. Storage Device (5)
 Other Storage devices – can be read/write
 Removable disks -Zip disk(100/250MB),
superdisk(120MB), Jazz disk(1GB)
 MO disk
 Flash memory cards – compact flash, smart
media and memory stick, commonly used in
digital camera

21. Network Devices (1)
 Network Interface Card (NIC) (LAN card)
 Connection between the network and the computer bus
 Have built-in transceiver, for data transmitting and receiving
 Usually 100 MB/s
 Wireless LAN card
 Usually 11 MB/s
 Work within the distance range, and no blocking in between.

22. Network Devices (2)
 Connectors
 RJ-45 telephone jack connector
 For connecting twisted pairs LAN cable
 BNC connector
 For connecting coaxial cables

23. Network Device (3)
 Terminators
 Use in bus network, to prevent signal rebounce
and echo at the ends of bus.

24. Network Device (4)
 Hub
 To connect the workstations within a room on
same floor
 Switch
 To connect the workstations for different floors in
a building, it is faster and more efficient than a
Hub.
 Router
 To connect different LANs together to form a
Wide Area Network (WAN)

25. Network Device (5)
 Repeater
 When a network spans a long distance, the signal
weaken, repeater is used to reproduce the signal.
 Exchange
 To boost the signals along the network path for a
Wide Area Network.

26. Network Device (6)
 Computer
 Different computers play different roles on a
network
 Server
 Provide services to other computers connected to
the network, usually have higher processing
power and larger storage capacity.
 Workstation
 The computers connected to the network but not
act as a server.

27. Network Device (7) - Servers
 File server
 control the sharing and access of files over the network, must
have a huge storage capacity.
 Print server
 Manage the print jobs from different computers to different
network printers, and manage the print queues.
 Web server
 To host a web site and publish web pages on the web,
support HTML, Java script, CGI, PHP and ASP web
languages
 Email server
 To store, send and receive emails over the Internet
 Internet server
 To provide Internet access

28. Communication Device
 Modem - Modulator-demodulator
 It transforms digital signals of computer to analog
signals to be transmitted through telephone lines.
(Modulation)
 It also transforms analog signals back to digital
signals for the computer that receives the signals.
(Demodulation)

29. Data/Signal Rate
 Data Rate
 Refer to the no. of bits per second sent
 Signaling Rate (Baud Rate)
 Refer to the no. of signals per second sent
 Each signal may consists of several bits e.g.
101
 Bandwidth
 The frequency range of a particular media
 is directly proportional to the data rate

30. References
 www.google.com
 www.wikipedia.org
 www.oeclib.in

31. Thanks