Ipt - Communication Systems

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An address book in email is used for what purpose?

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Used to store people's emails

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Advantage of Teleconferencing

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It reduces costs by simulating face-to-face meetings.

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Asynchronous transmission is...

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sending data by identifying each byte with a special start & stop bit

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Audio conferencing or Teleconferencing is what?

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A single phone call involving 3 or more people at different locations.

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Describe Bandwidth

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The Bandwidth is the capacity of the channel, or transmission medium.

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The Baud Rate is....

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The maximum number of data symbols or electrical signals that can be transmitted in one second

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Bits per Second (bps) is....

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The maximum number of bits that can be transmitted in one second.

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bits per second in relation to a communication setting is....

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The speed of transmission

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What is a Blind carbon copy (Bcc)

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A copy of an email that is sent to other people, but they can't see who else got it (optional)

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Bus topology

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all the devices are attached to a direct line called the bus. Nodes listen if the network is clear. If so, a node will transmit. If collision occurs, CSMA/CD Carrier Sense Multiple Access and Collision Detection allows node to re-transmit at later time.

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Carbon copy (Cc) (email header components)

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send message to other people apart from the recipient (optional)

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Checksum

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An error checking method that counts the bits in a data packet. Data is divided into packets the bits in each packet are counted and sent to the receiver if the number match it is assumed their is no errors

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Communication settings

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parameter settings that may be altered to allow computer or peripherals to communicate

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Communication system

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An information system that enables people to send and retrieve data

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Cyclic Redundancy Check (CRC)

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binary numbers are divided by a number. The remainder of the division is retained & sent. Receiving computer re-does the calculation. If both agree, it is OK to send. Detects 99.99% of all errors.

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Domain name (email address)

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The specific computer or server where the person's emails are stored

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EFTPOS (electronic founds transfer at point-of-sales)

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is a system that allows people to purchase good and services. It electronically transfers money from the costumer to the sellers bank

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Electronic Commerce (e-commerce)

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is buying or selling goods through the internet. It is a type of communication system

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Electronic banking

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allows people to view the bank accounts and transfer money between accounts online

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Electronic mail (email)

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is the sending of mail electronically. It was revolutionised by the invention of the internet. Can be sent around the world in minutes and to anyone who has an email address.

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Email Address

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The address of the person who is receiving or sending emails. They are unique and comprise of two parts. The name/username of the person and domain name (location on the Internet). They are separated by the @ symbol.

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Email message (structure)

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an email has two main parts. The header and the body. The header is like an envelope and the sender address is automatically added

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Error Checking

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When data arrives at its destination it may contain errors. These error must be detected and corrected

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error correction

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the most common form of error correction is to retransmit the data.

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Half-Duplex Data Flow

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the data flows both ways but only one way at a time e.g. walkie-talkies

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Full-Duplex Data Flow

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The data flows both ways, both at the same time e.g. telephone

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Handshaking

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An agreement on which protocol to use to accomplish the exchange of information.

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intelligent terminal/workstations

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a terminal that has both memory and processing capabilities most are called workstations on a network

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Issues with Electronic Banking

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loss of jobs, security of data, changing nature of work

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List issues with email

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spam and anti-spam legislation, changing nature of workspread of virusesuse of email in court cases

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Local Area Network (LANs)

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a network the connects computers within a small geographical areae.g. a building

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Mailing List (email)

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mailing list is a group of people who may want to receive the same message. e.g. a class at school

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Messaging system

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used to send messages to people in different locations who may receive the message at later time.

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Name the 2 ways of data transmission

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parallel transmission & serial transmission

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Network

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a number of computers and their peripheral device connected together in some way

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Network Topology

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the physical arrangement of devices in a network

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Node

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each device in a network

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Parallel transmission

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transferring data at the same time using separate channel. it is faster but get out of sync easily

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Parity Checking

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Is a method of error checking using an extra bit called a parity bit. It can be odd = odd number of 1's sent, or It can be even = even number of 1's sent.

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Protocol

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A set of rules that governs the transfer of data between computers

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Reply (email)

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automatically enters return email address and in the subject types Re: whatever subject the original sender named it

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Ring Topology

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All devices are attached so that the path is the shape of a continuous circle. Each device has a unique address. Data flows in one direction, moving from device to device until it arrives at destination. This avoids data collisions. A node transmits when it receives a token, hence, token ring network

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Serial transmission

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is transferring data one after another it is slower but less errors. Serial transmission can be asynchronous or synchronous

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Signature (email)

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several lines that can be automatically inserted at the bottom of an email.

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Simplex Data Flow

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the data flow is one direction (receives signal only)e.g Television, Radio

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Speed of transmission

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The speed of data transmission is determined by the transmitting device and the bandwidth.

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Star topology

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has a central computer with each device connected directly to it. The central computer acts like a switch and if it goes down, the whole network goes down.

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Stop/Start bits (communication setting)

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The number of stop start bit used in asynchronous transmission.The parameter is used to identify each bit

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Subject

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topic of the email or brief description (optional)

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Synchronous

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all data is sent at the same time and the same number of bytes is sent each second. It is faster and more efficient

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Teleconferencing

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the use electronic transmission to allow a meeting to occur at the same time at different place

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Terminal

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a device that send and receives data from anther computer system

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To (email header components)

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the address of the person receiving the mail

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Traditional ways of messaging systems

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mail telephone answering machinesfax- sends graphic over telephone line computer may have modern faxesAll of these are still used today

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Video conferencing (Teleconferencing)

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Allow people at different locations to see video and audio images of each other.

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Wide area network (WANs)

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a network that cover thousand of kilometers can use normal phone lines or leased data line

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5 components of a communication system

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SourceTransmitterTransmission MediumReceiverDestination