MAPPING YOUR MIND Bluetooth technology Mobile networks Digital Applications Analogue Visible light Signals Infrared waves Destination Microwaves Output transducer Electromagnetic spectrum Receiver Arranged in Channel Frequency Transmitter Wavelength Input transducer Trough Information source Crest Amplitude Components Features Wirelessly Electromagnetic waves Physical media Means of transmission The basics Uses Wireless 3.3 Telecommunications Via cables Other forms Twisted pairs Copper wires + insulating material Types Shielded twisted pairs Unshielded twisted pairs Coaxial cables PVC jacket + metallic shied + dielectric insulator + copper centre Fibre optic cables Plastic material + glass core Laser Electrons absorb energy from electrical current/light Visible, infrared, or ultraviolet wavelength Light Fidelity Uses LED or infrared light Satellite Uses ground station, communication satellite