transmission methods

1. What kind of transmission type would you use for each of the following?

A. keyboard b. telephone exchange to local streets c. mobile phones using Bluetooth d. TV connection to Sky dish e. analogue telephone network f. defence and intelligence gathering operations (6 marks)

A- Infrared B- Fibre optic C-Microwaves D-Coaxial E-UTP/STP F-Satellites

2. What is a geostationary satellite? (3 marks)

A satellite orbiting the earth at a height of 35,786km. It goes at the same speed the earth is rotating at. It therefore appears to be stationary above a single point on the earth’s surface. They transmit photographs to the receiving system on the ground as soon as the camera takes the picture

3. What does Mbps stand for? What is its transmission rate? (2 marks)

MBPS stands for Megabits per second. A transmission rate of 1mbps can transmit approximately one thousand million bits per second.

4. What is sun spot activity? Which transmission type does it affect? (3 marks)

Sun spot activity affects data transmissions. Every now and then there is the equivalent of a huge wave of flame released from the surface of the sun. This releases millions of charged particles, some of which hit the earth.

5. Complete this grid about Common Modes of Transmission p30 (6 marks)

Transmission mode	What it does	Example of its use
1. simplex transmission	Send data in only one direction.	A radio broadcast is a good example.
2. Half-duplex transmission	Devices don’t transmit at the same time but it allows you to send 2 way transmissions.	Some network systems are half-duplex to maximise bandwidth.
3. Full duplex transmission	Allows 2 way communications at the same time.	Telephone systems.  Land or mobile.

There has been roughly 8000 satellites that have been launched,, only one has ever been hit and  destroyed by such a force.