The new Multi Role Ocean Surveillance ship to be launched in 2024 is a vessel that the British army will use to protect undersea cables.

Outline the construction and operation of undersea cables citing an example    [4 Marks]

Describe any impairments that these cables have                                    [3 Marks]

Suggest a modulation method that would enable transfer of voice in these cables. Describe the modulation method mentioned                                                                 [3  Marks]

In cellular networks a subscriber may hear interference in the background due to another call. Interference may also cause calls to be dropped or blocked.

Explain any two causes of the interference                                                           [6 Marks]

 Explain how Spread spectrum reduces interference citing an example [4 Marks]