Transmission Media
- Created by: miacampbell31
- Created on: 25-03-22 11:37
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- Transmission Media
- Bandwidth
- - a measure of the capacity of a communication channel.
- - the range of frequencies that a channel can handle.
- - may be given as a frequency, such as 3 kHz, or as a transmission rate in bits per second.
- - transmission rate is often referred to as line speed, for example, channels might be described as having line speeds.
- - a measure of the capacity of a communication channel.
- Broadband
- - a method of connecting to the internet usually achieved by a technique known as digital subscriber line (DSL).
- - uses physical connections of the telephone system, but transmits data in a way that does not interfere with the voice frequencies.
- consequence of this are that data can be transmitted much faster than over a dial up connection, that ordinary voice calls are possible at the same time, and that there are no seperate call chargers for computer connection.
- Metal Cables
- Coaxial cable
- - made to a variety of specifications, same kind used for connection aerial to tv.
- - two conductors, one wire down the center which may be a single trans (insulated from the second), which is made up of many strands braided around the insulation for the inner wire.
- Twisted Pair
- - commonly used for data transmission
- - a pair of insulated copper wires twisted together surroned bya copper braid and external insulation
- - some cables are made up of a number of twisted pairs surronded by an overall earthed braid screen
- Unshielded Twisted Pair
- - similar to twisted pair, has no earthed shield
- - suitable circumstance allow for use in data transmission
- Coaxial cable
- Fibre Optic
- - consists of very fine glass strands that allow rapid transmission of data, using modulated light beams
- - provides interference-free, secure data transmission and is not subject to corrosion.
- - it is usual to put many strands together in a single cable, each 1 capable of carrying 1 or more data signals.
- Wireless
- - wireless covers a range of possible methods of data transmission which can be used for linking computers within networks or for links within computer systems.
- - wifi is a way of connecting computers to a network ia radio waves.
- - each computer has a Wi-Fi wireless interface that connects to a wireless access point attached to the network.
- - bluetooth is a short range wireless communications standard that uses low-power radio waves.
- - allows bluetooth equipped devices to communicate with other bluetooth devices in a peer-to-peer relationship.
- Bandwidth
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