iGCSE Comp Sci (CIE) - Transmission

How does data travel if the transmission is half-duplex?

• Data travels in one direction only

• Data can travel in both directions simultaneously

• Data can travel in both directions but NOT simultaneously

• Data travels at half speed

• Data is transmitted in parallel to half the time of transmission

Answer explanation

Half-Duplex - Data can travel in both directions, but not simultaneously (e.g. parallel printer cables)

Which are true for Serial Transmission

• Bits are sent one signal at a time over a single wire

• Many signals are sent simultaneously

• It generally has very high transfer rates.

• Skewing can occur

• It is slower than parallel transmission

Skewing is when each wire in a parallel cable has slightly different properties so signals travel down wires at different speeds.

• True

• False

What is the electrical interference called that can occur when wires are very close to each other in parallel transmission.

• Swapping

• Cross-Talk

• Parity Bit

• Cross-Swap

• Exchange errors

The amount of data that can be transmitted at one time is referred to as it's ______________?

Answer explanation

remember bandwidth is one word!

Which of these statements are true?

• In parallel transmission, the cost of hardware is expensive compared to serial transmission

• Skewing can occur in parallel transmission

• Parallel transmission should be over a small distance to prevent skewing

• A printer cable is an example of a cable with parallel transmission

• All parallel transmission direction is duplex.