Simplex data transmission

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Quick Questions

Shade in the A or B circle for each question.

1. Which statement describes simplex transmission?

A Data travels in both directions, but only one way at a time

B Data travels in one direction only, from sender to receiver

2. A keyboard sends key presses to a computer. Which type of transmission is this?

A Simplex

B Full-duplex

3. In simplex transmission, can the receiver send a reply back to the sender along the same link?

A Yes, it can reply at any time

B No, no reply is possible

4. A computer sends a document to a printer. Which description fits the data flow if only the computer sends data?

A Simplex: data goes from computer to printer only

B Full-duplex: both devices send at the same time

5. Which direction does data travel in simplex transmission?

A Sender to receiver only

B Sender to receiver and receiver to sender

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1simplex		AThe arrow points the wrong way. Key presses go from the keyboard to the computer, so it should be keyboard -> computer.
2keyboard -> computer		Bsender -> receiver
3In simplex transmission, the receiver cannot send a reply to the sender		Ccomputer -> printer
4Sending a document to a printer in one direction only is an example of simplex		DData travels in one direction only, from sender to receiver
5simplex: sender <-> receiver		EThe two-way arrow is wrong. Simplex is one direction only, so it should be sender -> receiver. Two-way arrows show duplex.
6simplex: keyboard <- computer		FSimplex example: key presses go to the computer and nothing comes back

Definitions

simplex

Fill in the Blanks

Complete each line of code by filling in the missing parts.

mode = _______

SEND keypress FROM keyboard TO ________

SEND document FROM computer TO _______

IF mode = SIMPLEX THEN reply = _____

mode = SIMPLEX directions = _

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A mode ← 'simplex'

B direction ← 'two way'

C sender ← 'keyboard'

D receiver ← 'computer'

Question 2

A IF mode = 'simplex' THEN

B sender ← 'keyboard'

C receiver ← 'computer'

D reply_possible ← TRUE

E ENDIF

Question 3

A sender ← 'computer'

B receiver ← 'printer'

C SEND document TO sender

Question 4

A sender ← 'keyboard'

B receiver ← 'computer'

C SEND key TO receiver

D mode ← 'half-duplex'

Question 5

A IF direction = 'both ways' THEN

B OUTPUT 'simplex'

C ELSE

D OUTPUT 'not simplex'

E ENDIF

Answer Key

Simplex data transmission

Section A: Quick Questions

B — Data travels in one direction only, from sender to receiver

A — Simplex

B — No, no reply is possible

A — Simplex: data goes from computer to printer only

A — Sender to receiver only

Section B: Match the Pairs

simplex → Data travels in one direction only, from sender to receiver

keyboard -> computer → Simplex example: key presses go to the computer and nothing comes back

In simplex transmission, the receiver cannot send a reply to the sender → sender -> receiver

Sending a document to a printer in one direction only is an example of simplex → computer -> printer

simplex: sender <-> receiver → The two-way arrow is wrong. Simplex is one direction only, so it should be sender -> receiver. Two-way arrows show duplex.

simplex: keyboard <- computer → The arrow points the wrong way. Key presses go from the keyboard to the computer, so it should be keyboard -> computer.

Section C: Definitions

simplex — Data transmission in one direction only, from sender to receiver, with no reply possible. Example: a keyboard sending key presses to a computer.

Section D: Fill in the Blanks

mode = SIMPLEX

SEND keypress FROM keyboard TO computer

SEND document FROM computer TO printer

IF mode = SIMPLEX THEN reply = FALSE

mode = SIMPLEX
directions = 1

Section E: Spot the Error

B — Simplex sends data in one direction only. The direction should be 'one way', not 'two way'.

D — In simplex transmission no reply is possible, so reply_possible must be FALSE.

C — Data travels from the sender to the receiver. The document must be sent TO the receiver (the printer), not back to the sender.

D — A keyboard only sends key presses one way to the computer. That is simplex, not half-duplex, which allows both directions at different times.

A — Simplex means data goes one way only. The test should check for 'one way', otherwise the program labels two-way transmission as simplex.