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Data communications

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A computer network connects computers that communicate over transmission lines. There are three main types of networks: local area networks (LANs) that connect computers in a single location, wide area networks (WANs) that connect computers across different geographic sites, and the Internet which is a global network of networks. LANs connect computers within half a mile using switches, cables, and network interface cards. WANs connect computers at physically separate sites using technologies like leased lines, public switched networks, and virtual private networks. When choosing a network, considerations include setup, operational, and maintenance costs as well as performance factors and growth potential.

Data Communications Chapter 6

What is a Computer Network? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Major Network Types

Local Area Networks ,[object Object],[object Object],[object Object],[object Object]

Local Area Networks (Continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Local Area Networks (Continued) ,[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Figure 5-6 Local Area Network

IEEE 802.3 or Ethernet Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

IEE 802.3 or Ethernet Protocol (Continued) ,[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

LANs with Wireless Connections ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Figure 5-10 © 2007 Prentice Hall, Inc.

Figure 5-12 Summary of LAN and WAN Networks © 2007 Prentice Hall, Inc.

Wide Area Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Connecting the Personal Computer to an ISP: Modems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Figure 5-14 Personal Computer (PC) Internet Access

DSL Modems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

DSL Modems (Continued) ,[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Cable Modems ,[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Figure 5-15 Wide Area Network Using Leased Lines © 2007 Prentice Hall, Inc.

Networks of Leased Lines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Figure 5-16 Transmission Line Types, Uses, and Speeds © 2007 Prentice Hall, Inc.

Public Switched Data Network ,[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Public Switched Data Network (Continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Figure 5-17 Wide Area Network Using PSDN

Virtual Private Network ,[object Object],[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Virtual Private Network (Continued) ,[object Object],[object Object],[object Object],© 2007 Prentice Hall, Inc.

Example of Remote Access Using a VPN

Example of a WAN using VPN

Criteria for Comparing WANS ,[object Object],[object Object],[object Object],[object Object],[object Object]

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This document discusses analog transmission and digital-to-analog conversion. It is a presentation by the team Blackhole from Sylhet International University. The team members are listed. The presentation will discuss analog transmission, digital-to-analog conversion, and analog-to-analog modulation. It defines analog transmission and digital-to-analog conversion. It also discusses bit and baud rates. The types of digital-to-analog modulation covered are ASK, FSK, PSK, and QAM. Implementations of these modulations are shown. Finally, it discusses the three types of analog-to-analog modulation: amplitude modulation, frequency modulation, and phase modulation.

Analog transmission

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Analog transmission

This document discusses various digital-to-analog conversion techniques used in analog transmission of digital data. It describes amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) and quadrature amplitude modulation (QAM). ASK encodes data by changing the amplitude of a carrier signal. FSK uses frequency changes to encode data while PSK varies the phase. QAM combines ASK and PSK, encoding multiple bits onto distinct signal points defined by amplitude and phase. The bandwidth requirements of these techniques are also examined along with examples of calculating bit rates from given parameters.

2[1].1 data transmission

2[1].1 data transmission

2[1].1 data transmission

The document introduces some key concepts in data communication, including: 1) Different types of transmission media such as guided (e.g. fiber optic cable) and unguided (e.g. wireless). 2) Analog and digital signals and how analog data can be transmitted using either type of signal. 3) Factors that can impair transmission such as attenuation, delay distortion, and different types of noise. The Nyquist bandwidth and Shannon capacity formulas for calculating maximum data rates are also covered.

Digital & analog transmission

Digital & analog transmission

Digital & analog transmission

This document discusses various methods of information transmission including digital-to-digital, analog-to-digital, transmission modes, digital-to-analog, and analog-to-analog conversion. It describes techniques such as line coding, block coding, pulse code modulation, delta modulation, asynchronous/synchronous/isochronous transmission, and analog modulation methods including amplitude, frequency, and phase modulation. The key steps and processes involved in each conversion technique are explained, along with considerations for bandwidth and how analog or digital signals are represented.

Analog Transmission

Analog Transmission

Analog Transmission

Modulation is the process of varying one or more characteristics of a high-frequency carrier signal based on an information signal that contains the message to be transmitted. Some key points: 1. Modulation is necessary to transmit digital data over analog mediums like phone lines or wireless signals. It converts the digital data into an analog format suitable for transmission. 2. Common analog modulation techniques vary the amplitude, frequency, or phase of the carrier signal, while digital modulation techniques include amplitude-shift keying, frequency-shift keying, and phase-shift keying. 3. More advanced techniques like quadrature amplitude modulation vary both the amplitude and phase of the carrier simultaneously to transmit more data using a given bandwidth

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Secure Data Transmission

The document describes a system for secure data transmission through RF technology. It discusses encoding and transmitting data securely by encrypting it using an algorithm and wireless RF modules. The system uses a PIC microcontroller, MAX232 chip, and RF transmitter and receiver modules operating at 433.92MHz to encrypt data on a PC, transmit it wirelessly, and decrypt it on receipt. The system provides a basic level of security for data transmission through wireless communication.

Data communication and network Chapter - 2

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Data communication and network Chapter - 2

The document discusses network protocols and Ethernet. It provides details on: - Common network protocols include Ethernet, LocalTalk, Token Ring, FDDI, and ATM. Ethernet is the most widely used protocol. - Ethernet uses CSMA/CD access method where nodes listen before transmitting and can detect collisions. It operates at speeds of 10 Mbps, 100 Mbps, 1 Gbps, and 10 Gbps. - Ethernet standards include IEEE 802.3 for 10BASE-T, 802.3u for 100BASE-TX, 802.3z for 1000BASE-T, and 802.3ae for 10 Gbps.

Chap5 analog transmission

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Chap5 analog transmission

This document discusses analog transmission techniques. It covers digital-to-analog conversion methods like ASK, FSK, PSK and QAM. It then discusses analog-to-analog modulation techniques like amplitude modulation, frequency modulation and phase modulation. It provides examples of calculating the bandwidth requirements for different modulation schemes and how analog signals are allocated specific frequency bands for transmission.

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Data transmission

International Islamic University

This document discusses various topics related to data transmission including: - Data transmission involves transferring electromagnetic signals over a physical communication channel like copper wires or wireless channels. - Transmission modes can be parallel (multiple bits sent at once) or serial (one bit at a time). Serial transmission is further divided into asynchronous and synchronous types. - Asynchronous transmission groups data into start-stop bit sequences while synchronous transmission uses device-generated clocks for synchronization.

Serial transmission

Serial transmission

Serial transmission

Piyush Rochwani

Serial transmission reduces costs compared to parallel transmission by sending data one bit at a time over a single communication channel rather than multiple bits simultaneously over multiple channels. There are two types of serial transmission: synchronous uses a common clock and eliminates wasted bits while asynchronous uses start and stop bits but is slower. Shift registers can be used to serially input and output data from a data word non-destructively using control lines to indicate writing versus reading cycles.

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The document discusses network security and provides an overview of five security services: message confidentiality, message integrity, message authentication, message nonrepudiation, and entity authentication. It describes how each of these services can be achieved using techniques like symmetric and asymmetric encryption, hashing, digital signatures, challenge-response authentication, and key management protocols.

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This document discusses error detection and correction techniques for digital data transmission. It introduces different types of errors that can occur, such as single-bit and burst errors. It describes how redundancy is used to detect and correct errors using block coding techniques. Specific examples are provided to illustrate how block codes are constructed and used to detect and correct errors. Key concepts discussed include linear block codes, Hamming distance, minimum Hamming distance, and how these relate to the error detection and correction capabilities of different coding schemes.

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The document discusses bandwidth utilization techniques including multiplexing and spreading. Multiplexing allows simultaneous transmission of multiple signals across a single data link by dividing the bandwidth into channels. Efficiency is achieved through multiplexing while privacy and anti-jamming is achieved through spreading techniques that add redundancy such as frequency hopping spread spectrum and direct sequence spread spectrum. The document provides examples and figures to illustrate concepts such as frequency-division multiplexing, time-division multiplexing, and digital signal hierarchies.

Chapter 26 - Remote Logging, Electronic Mail & File Transfer

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Chapter 26 - Remote Logging, Electronic Mail & File Transfer

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Digital data transmission,line coding and pulse shaping

Digital data transmission,line coding and pulse shaping

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This document discusses digital data transmission, line coding, and pulse shaping. It covers several key topics: - Digital data transmission involves converting analog signals like voice or images to binary digits for transmission and reconverting them at the receiving end. This allows for clearer, faster transmission using less bandwidth. - There are two main transmission modes: parallel transmits multiple bits at once for higher speed, while serial transmits one bit at a time to reduce costs. Conversion is needed between parallel and serial interfaces. - Line coding converts digital bits to voltage levels for transmission. Common schemes include NRZ, RZ, Manchester, AMI, and pseudoternary. - Pulse shaping filters transmitted pulses to limit

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The document discusses the Domain Name System (DNS) which provides a hierarchical and distributed naming system that maps human-friendly domain names to computer-friendly IP addresses. It describes the domain name space structure, distribution of name servers across a hierarchy, DNS in the internet with different top-level domains, name resolution process, DNS message formats, record types, registrars, dynamic DNS, and encapsulation using UDP and TCP.

Chap 5 analog transmission

Chap 5 analog transmission

Chap 5 analog transmission

This document discusses various types of analog transmission techniques. It defines analog transmission as the transmission of analog signals using a band-pass channel, where baseband signals are converted to complex analog signals with frequencies suitable for the channel. It describes different modulation techniques used in analog transmission including amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), and quadrature amplitude modulation (QAM). It also discusses analog-to-analog conversion techniques such as amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).

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The document summarizes key concepts related to network layer addressing, error reporting, and multicasting from Chapter 21. It includes: 1) Address mapping allows mapping between logical and physical addresses either statically or dynamically using protocols like ARP. 2) ICMP compensates for IP's lack of error reporting and host/management queries through error messages and query messages. 3) IGMP manages multicast group membership and communication on local networks through group management and messages. 4) ICMPv6 is modified from ICMPv4 for IPv6 with updated error reporting and query messages.

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This document discusses different types of connecting devices used in computer networks, including passive hubs, active hubs, bridges, switches, routers and gateways. It also covers backbone networks that allow multiple LANs to be connected using bus or star topologies. Finally, it describes virtual LANs (VLANs) which use software rather than physical wiring to configure local area networks and control communication between switches.

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Chap 4 hardware & software

Chap 4 hardware & software

Is for competitive advantage

Is for competitive advantage

Is for competitive advantage

Chap 2 collaboration information systems and teamwork

Chap 2 collaboration information systems and teamwork

Chap 2 collaboration information systems and teamwork

Week 1 bua 235

E Business & E Commerce +

E Business & E Commerce +

E Business & E Commerce +

Chapter 3 E Business

Chapter 3 E Business

Chapter 3 E Business

Chapter 2 Decision Making

Chapter 2 Decision Making

Chapter 2 Decision Making

Welcome To BUA 235-Intro

Welcome To BUA 235-Intro

Welcome To BUA 235-Intro

Enterprise Systems: SCM, CRM, & ERP

Enterprise Systems: SCM, CRM, & ERP

Enterprise Systems: SCM, CRM, & ERP

Data communications

1. Data Communications Chapter 6

2.

3. Major Network Types

4.

5.

6.

7. Figure 5-6 Local Area Network

8.

9.

10.

11. Figure 5-10 © 2007 Prentice Hall, Inc.

12. Figure 5-12 Summary of LAN and WAN Networks © 2007 Prentice Hall, Inc.

13.

14.

15. Figure 5-14 Personal Computer (PC) Internet Access

16.

17.

18.

19. Figure 5-15 Wide Area Network Using Leased Lines © 2007 Prentice Hall, Inc.

20.

21. Figure 5-16 Transmission Line Types, Uses, and Speeds © 2007 Prentice Hall, Inc.

22.

23.

24. Figure 5-17 Wide Area Network Using PSDN

25.

26.

27. Example of Remote Access Using a VPN

28. Example of a WAN using VPN

29.

30.

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