Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

WJEC CG3.1

Topic 1: Hardware -Data transmission

TermDefinition
Circuit switching Path is set up between sender and receiver and is released after transmission is complete. It cannot be used by any other traffic during that time.Data is sent in order
Packet switching Data (content) split into packets, which can take a different route through network and may arrive out of order - then re-assembled. Each packet carries the source and destination addresses.
Packet information the actual data; order number of packet; source and destination addresses; control signals; error control bits.
Why is Packet switching preferred? Better security. More efficient use of data lines - no waiting during gaps. Less likely to be affected by network failure.
Half-duplex transmission is when data can be sent in only one direction at a time.
Full duplex Data can be sent in both directions at once / simultaneously / at same time.
Simplex Data transmission is possible in one direction only.
Serial transmission occurs when binary digits (bits) are sent one by one along the data channel.
Parallel transmission occurs when a number of bits are sent simultaneously.
Why are Network protocols necessary? To specify data formats; to enable devices to communicate with each other.
Data collision occurs when two sets of data are detected on the network simultaneously. Once detected, a computer waits for a short random time then sends again.
Multiplexing is where several independent data sources are combined to be sent along a single route to a single destination.
Router is a device in a network which holds information about the addresses of computers in the network or other networks and can send data to the correct computer / network / device.
Switching prevents all data being sent to all parts of a network / makes efficient use of the data lines.
Digital transmission preference is preferred as it is less likely to suffer corruption/degradation/interference
Protocols are necessary to specify data formats, etc, to enable devices to communicate with each other.
Parallel transmission occurs when a number of bits are sent simultaneously/ sent over multiple paths / lines.
Parallel processing the simultaneous use of several processors/cores to perform a single task. It could be useful where an extremely large/complicated calculation is being carried out (e.g. weather forecasting
Benefits of digital transmission is preferred as it is less likely to suffer corruption/degradation. Can error check data. Can compress data and therefore transfer time is quicker.
Created by: mcounsell
Popular Computers sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards