My Introduction - Computer and telecomunication system
My Introduction
Name : Kustanto
Address: Perum. Puri Malangjiwan 3. N0. 12. Colomadu
Highest education: S2 TE UGM
Concentration : Computer Systems
InformaticsFinal Assessment
Presence = 5%
Task = @15%
Midterms = 30%
Final Exams = 35%
Delay Tolerance Attend College = 20 Minute
Chaper 1.
Computer Systems
by KustantoInput-Process-Output Model (IPO)
- Input: keyboard, mouse, scanner, punch cards
- Processing: CPU executes the computer program
- Output: monitor, printer, fax machine
- Storage: hard drive, optical media, diskettes, magnetic tape
CPU and Main Memory
Central
Processing
Unit
Main Memory
Chip that executes Chip that executes program program commands commands Intel Pentium III Intel Pentium III Sun Sparc Sun Sparc Processor Processor Primary storage area Primary storage area for programs and data for programs and data that are in active use that are in active use Synonymous with RAM Synonymous with RAM
Secondary Memory Devices
- Hard disks
- Floppy disks
- ZIP disks
- Writable CDs
- Tapes
Floppy Disk Hard Disk Main Memory Central Processing Unit
Secondary memory Secondary memory devices provide devices provide long-term storage, long-term storage, namely: namely: Information is moved Information is moved between main memory between main memory and secondary memory and secondary memory as needed as needed
Hard disks
Floppy disks
ZIP disks
Writable CDs
Tapes
Input / Output Devices Monitor Keyboard Main Memory Central Processing Unit Floppy Disk Hard Disk
I/O devices allow user I/O devices allow user interaction interaction Monitor screen Monitor screen Keyboard Keyboard Mouse Mouse Bar code scanner Bar code scanner Light pen Light pen Touch screen Touch screen
Architecture Components
Hardware Processes data by executing instructions
Provides input and output
Software
Instructions executed by the system
Data Fundamental representation of facts and
observations
Communications
Sharing data and processing among different
systemsHardware Component
Input/Output devices
Storage Devices
CPU
ALU: arithmetic/logic unit
CU: control unit
Interface unit Memory
Short-term storage for CPU calculations
Memory
Main memory is Main memory is divided into many divided into many memory locations (or memory locations (or
cells cells
) )
9278 9278 9279 9279 9280 9280 9281 9281 9282 9282 9283 9283 9284 9284 9285 9285 9286 9286
Each memory cell has Each memory cell has a numeric a numeric
address address
, , which uniquely which uniquely identifies it identifies it
Storing Information 9278 9278 9279 9279 9280 9280 9281 9281 9282 9282 9283 9283 9284 9284 9285 9285 9286 9286
Large values are Large values are stored in consecutive stored in consecutive memory locations memory locations
10011010
10011010 Each memory cell Each memory cell stores a set number of stores a set number of bits (usually 8 bits, or bits (usually 8 bits, or one one
byte byte
) )
Typical Personal Computer System
CPU: Central Processing Unit
ALU: arithmetic/logic unit
Performs arithmetic and Boolean logical calculations
CU: control unit
Controls processing of instructions
Controls movement of data within the CPU
Interface unit
Moves instructions and data between the CPU and other hardware components
Bus : bundle of wires that carry signals and power
between different components
The Central Processing Unit
A CPU is also called a microprocessor
It continuously follows the fetch-decode-execute cycle: fetch
Retrieve an instruction from main memory Retrieve an instruction from main memory
decode
Determine what the Determine what the instruction is instruction is
execute
Carry out the Carry out the instruction instruction
The Central Processing Unit
(CPU) The CPU contains: Arithmetic / Logic Unit
Registers Control Unit Small storage Small storage areas areas Performs calculations Performs calculations and decisions and decisions Coordinates Coordinates processing processing steps steps
The Central Processing Unit
The speed of a CPU is controlled by the system clock
The system clock generates an electronic pulse at regular intervals
The pulses coordinate the activities of the CPU
The speed is measured in megahertz (MHz)
Memory
Also known as primary storage , working storage, and RAM (random access memory)
Consists of bits, each of which hold a value of either 0 or 1 (8 bits = 1 byte)
Holds both instructions and data of a computer program ( stored program concept )
Storage Capacity
Every memory device has a storage capacity,
indicating the number of bytes it can hold Capacities are expressed in various units: Unit Symbol Number of Bytes Unit Symbol Number of Bytes 10 10 KB 2 = 1024 kilobyte KB 2 = 1024 kilobyte 20 20 megabyte megabyte MB MB
2 2 (over 1 million) (over 1 million) gigabyte gigabyte 30 30 GB 2 (over 1 billion) GB 2 (over 1 billion) terabyte terabyte 40 40 TB TB
2 2 (over 1 trillion) (over 1 trillion)
Memory
Main memory is volatile - stored information is lost if the electric power is removed
Secondary memory devices are nonvolatile
Main memory and disks are direct access devices -
information can be reached directly The terms direct access and random access are often used interchangeably
A magnetic tape is a sequential access device since its data is arranged in a linear order - you must get by the
intervening data in order to access other information
RAM vs. ROM
RAM - Random Access Memory (direct access)
ROM - Read-Only Memory
The terms RAM and main memory are basically interchangeable
ROM could be a set of memory chips, or a separate device, such as a CD ROM
Both RAM and ROM are random (direct) access devices!
RAM should probably be called Read-Write Memory
ROM
Monitor
The size of a monitor (17") is measured diagonally, like a television screen
Most monitors these days have multimedia capabilities: text, graphics, video, etc.
A monitor has a certain maximum resolution , indicating the number of picture elements, called pixels, that it can display (such as 1280 by 1024)
High resolution (more pixels) produces sharper pictures
Modem
Data transfer devices allow information to be sent and received between computers
Many computers include a modem, which allows information to be moved across a telephone line
A data transfer device has a maximum data transfer rate
A modem, for instance, may have a data transfer rate of 56,000 bits per second (bps)
Networks
A network is two or more computers that are connected so that data and resources can be shared
Most computers are connected to some kind of network
Each computer has its own network address, which uniquely identifies it among the others
A file server is a network computer dedicated to storing programs and data that are shared among network users
A Computer Specification
Consider the following specification for a
personal computer: 600 MHz Pentium III Processor
256 MB RAM
16 GB Hard Disk
24x speed CD ROM Drive
17” Multimedia Video Display with 1280 x 1024 resolution
56 KB Modem
Interconnection system computer CPU
Software Component
Applications
Operating System
API: application program interface
File management
I/O
Kernel Memory management Resource scheduling Program communication Security
Network Module
Communications Component
Hardware
Communication channels Physical connections between computer systems Examples: wire cable, phone lines, fiber optic cable,
infrared light, radio waves
Interface hardware
Handles communication between the computer and the communication channel Modem or network interface card (NIC)
Software
Network protocols: HTTP, TCP/IP, ATAPI
Computer Systems
All computer systems, consists of the following:
At least one CPU
Memory to hold programs and data
I/O devices
Long-term storage
Protocols
Common ground rules of communication between computers, I/O
devices, and many software programs
Examples
HTTP: between Web servers and Web browsers
TCP/IP: between computers on the Internet and local area networks
ATAPI: between a CPU and CD-ROMs
Standards
Created to ensure universal compatibility of
data formats and protocols May be created by committee or may become a de facto standard through popular use
Examples:
Computer languages: Java, SQL, C, JavaScript
Display standards: Postscript, MPEG-2, JPEG, GIF
Character set standards: ASCII, Unicode, EBCDIC
Video standards: VGA, XGA, RGB Telecommunications System
Terminals office equipment , telephones , ...
Telecommunications processors modems, multiplexers, front-end processors, ...
Telecommunications channels and media
copper wires, coaxial cables, fiber optic cables, satellites, ...
Computers
host computers, network servers, ...
Telecommunications control software
telecommunication monitors, network operating systems, ...
O’Brien 125
Telecommunication model
End-user workstation Telecommunications software
Computers Telecom processors Telecom processors Telecom
Channels and Media 5 components
O’Brien 126
Telecommunication Components
LAN
PC-workstation PC-workstation PC-workstation PC-workstation PC-workstation PC-workstation
Network Server Port to other networks
Shared hard disk Shared printer
Databases and Software packages O’Brien 127 - 128
WAN - Internetwork
network in US network in Europe
Mainframe, hosts Internet network in Australia
LAN’s LAN’s
Client/server network
Intranet Company A
Intranet
Router Router Internet
Firewall Firewall
Company B
Client - Server
Clients
server comm. server DB. server Print server DB. server server server
Clients comm
The Internetwork-enterprise
The Internet
Intranets
Intranets
Intranets
IntranetsExtranets Client
Enterprise
Supplier
Other Organizations
Electronic CommerceMedia and Channels
Signals
analog
digital
Cables
Twisted-pair interference
Coaxial cable 20x more expensive
5.500 simultaneous phone calls
Fiber-optic 1 fiber 30.000 phone calls
Wireless microwave satellites
Radio, Infrared, Cellular Radio, Mobile computing
GPS global positioning system Medium Transmission speed Metal wire .0012Mbps - 10 Mbps Microwave .256 Mbps - 100Mbps Fiber optics .5Mbps - 1,000Mbps
Communication hardware
Modems 9.600 14.400 28.800 bps
Transmission mode
Simplex 1 circuit , 1 direction
Half-duplex 1 circuit, 2 directions, difficult co-ordination
Full duplex 2 circuits, 2 directions
Transmission accurateness
parity bits forward and backward error correction
Processors
multiplexers frequency, time or statistic time distribution
front-end processors to handle routine communication tasks with peripheral equipment
Network Topology
Star
all communications go via the central system
Bus
can easily be extended at the ends
Ring
more secure
O’Brien 147 - 148
Star network
With direct connections Point-to-point lines
- Efficientfi , alfiso for gi g seee s
- Witfig a lfiar e number of workstfiatfiions cablfiin mi gtfi be a eroblfiem
Star network (multiplexed)
Access via mulfitfiielfiexe lfiines eventfiualfilfiy rentfie
- lfiocalfi seee ue tfio 2000 cgar/sec , 1M cgar/sec very exeensive
- intfiernatfiionalfilfiy 1000 cgar/sec commonlfiy availfiablfie
Multidrop lines Bus network
Sgare usa e of a broa ban netfiwork
- more comelfiex gar ware
- simelfier cablfiin systfiem
Ring Networks
O’Brien 147
Ring Network
- more equalfi basis
Public data networks
PAD = Packetfi Assemblfier an Disassemblfier
Datfia Netfiwork
PAD
E. ..: DCS 1000 - 6000 cgar/sec , costfi / volfiume atfia ( X25 ) Due tfio gi g connectfiion costfi ($ 30.000 year) usa e of PAD
ISDN
ISDN
ISDN Intfie ratfie services Di itfialfi netfiwork
- universalfi netfiwork for tfielfieegone an atfia
Communication Systems th lecture
Department of Applied Sciences University of Freiburg
Textbook Overview
Web site:
Part 1 (Chapter 1)
Computer system overview
Part 2 (Chapters 2-5) Number systems and data formats
Part 3 (Chapters 6-12)
Computer architecture and hardware operation
Part 4 (Chapters 13-18) Software – operating systems, applications, development environments
Part 5 (Supplementary Chapters 1-3)
Digital logic, addressing modes, and communication channel
technology Text books (german):
Jochen Schiller, Mobilkommunikation
Bernhard Walke, Mobilfunknetze und ihre Protokolle, Grundlagen GSM, Universal Mobile Telecommunications System (UMTS) , ...
Link (see seminar slides and papers):
http://www.ks.uni-freiburg.de/download/ papers/telsemWS05/UMTS-
nextGeneration/UMTS-Seminararbeit-
Stefan%20Nagy.pdf End Of Sessions