Section E - 1 - Transmitting Data - Data Transmission

What communication channel sends data in both directions simultaneously?

• Half-Simplex

• Simplex

• Half-Duplex

• Full-Duplex

What communication channel does a walkie-talkie use?

• Half-Simplex

• Simplex

• Half-Duplex

• Full-Duplex

Which of the following devices uses full-duplex data transmission?

• Mouse

• Smartphone

• Remote Control

• Radio

Which of the following is a disadvantage of multi-drop?

• The lack of start and stop bits means it is generally faster than point-to-point.

• Data has to pass through many intermediary devices to reach its destination.

• There can be security issues as data is being sent over a shared channel.

• It is less efficient when transmitting data to multiple devices than connecting together many point-to-point connections.

With asynchronous transmission, data is sent as a continuous stream, with no gaps in data.

• True

• False

With asynchronous transmission, how does a device identify the beginning and end of a data packet?

• By including start and stop bits in the data packets.

• By syncing the internal clocks of the devices.

• By closing the transmission connection after the packet completion.

• They don't mark the beginning and end of data packets.

Which of the following are reasons why serial transmission is better over longer distances than parallel transmission?

Choose two options.

• Data is sent in a specific order, whereas parallel transmission can lead signal skewing where the bits don’t arrive at the same time.

• As data can be sent at higher frequencies, this means the range of the transmission is much greater.

• Due to only having one wire, we don’t suffer from crosstalk, where data transfers between channels leading to corruption of the data.

• As parallel transmission uses multiple wires, this can lead to longer cables becoming twisted and damaged.

Which form of data transmission is actually faster?

• Serial

• Parallel

As serial transmission sends data one bit at a time, it can only send data in one direction.

• True

• False