Data transmission (paper 1)

a small part of data that is transmitted over a network

the part of the data packet that contains the IP addresses and inclueds the packet number

the part of a data packet that indicates the end of the data packet and cyclic reduncancy check error check

an error check method in which all the 1-bits in the data packet payload are added and the total is stored in the packet trailer

the actual data being carried in a data packet

Stages in a network that can receive and transmit data packets

a method of transmission in which a message is broken into many data packets which can be sent along pathways independently

a device that enables data packets to be moved between different networks

the transmission of data over a network for live events where the data is sent as soon as it is received or generated

a number in a packet header used to stop data packets that never reaches their destinataion from ‘clogging up’ the data paths

data that can be sent in one direction only

data that can be sent in both directions but not at the same time

data that can be sent in both directions at the same time

sending data down one channel/wire one bit at a time at very high speeds

sending data down several channels/wires serveral bits at a time over short distances

data that arrives at the destination with the bits no longer synchronised

universal serial bus

a type of serial data transmission which has become the industry standard for connecting computers to devices via a USB port

a unique string of characters that identifies each computer using the Internet Protocol to communicate over a network

• no need to tie up a single connection line • can easily overcome failed lines by re-reouting packets

• data is broken donw into packets • each packet is given a sequence number and sent • each packet may take a different route depending on the quickest route in the moment • routers control the route the packet takes • packets may arrive out of order • the sequence numbers put them back into order

• lower interference • more reliable over longer distances • smaller, simpler and cheaper connections to produce

• lower transmission speeds

• very fast data transfer • can send data in both directions at the same time