Communication

Question 1

Define Communication

Answer 1

-Transmitting and receiving data in electromagnetic signals

Question 2

Define Synchronous Transmission

Answer 2

• Bits transferred over channel at constant rate

- Synchronised by clock signal

Question 3

Define Asynchronous Transmission

Answer 3

-Transmitted when available
(Transmission Channel can be idle)
-Start and Stop Bits

Question 4

Define Serial Transmission

Answer 4

-Data sent in sequence over a single wire

Question 5

Define Parallel Transmission

Answer 5

• Several bits sent at the same time

- Short Distances

Question 6

Parallel vs Serial Transmission

Answer 6

• Crosstalk: Electromagnetic interference between wires results in corrupted data
• Skew: bits transmitted at different speeds

-Serial uses less wires, no skew or crosstalk

Question 7

Define Bit rate

Answer 7

Number of bits transmitted over a channel each second

baud rate x number of bits per signal change

Question 8

Define Baud Rate

Answer 8

Number of times signal changes per second

Question 9

When is Bit rate different to Baud rate

Answer 9

• Broadband transmission supports multiple frequency bands and voltage levels
• Signal change can represent more than one bit

Question 10

Define Bandwidth

Answer 10

Maximum rate of data transfer of a channel

Directly proportional with bit rate

Question 11

Define latency

Answer 11

Delay between sending and receiving signal

Question 12

Define Protocol

Answer 12

Set of rules that determine the communication between devices