communication media
DESCRIPTION
communication media and its typesTRANSCRIPT
Communication Media
Presented by,
Lijomol Jose
Communication Media
• Communication media refers to the means of delivering and receiving data or information.
• It is classified into 2 categories
-Guided Media
-Unguided Media
Guided Media
• In the form of cables, wires…
• Medium is more important
• Classified into 3
-Twisted pair wire cable
-Coaxial cable
-Optical Fiber
Twisted pair-wire cables
• Pairs of insulated copper wires twisted together
• One wire carries the signal while the other wire is grounded and absorbs signal interference
• The least expensive type of LAN cable
Advantages
• Inexpensive• Easy to work with
Disadvantages
• Limited Bandwidth• Vulnerable to interference and noise
• Twisted pair wire cable divided into 2
-Shielded Twisted Pair
-Unshielded Twisted Pair
Shielded Twisted Pair (STP)
• Metal sheathing that reduces interference• More Expensive• Difficult to handle (heavy, thick)
Unshielded Twisted Pair (UTP)
• It is cheapest• Easy to install• Suffers from external Electro Magnetic (EM)
interference• E.g. Ordinary Telephone wire
Coaxial Cables
• Consists of an inner conductor wire surrounded by insulation called the di-electric
• The di-electric is surrounded by a conductive shield, which is surrounded by a non-conductive jacket
• The shield minimizes electrical and radio frequency interference
• It is the primary type of cabling used by the cable TV industry and is also widely used for computer networks
Advantages
• Better data transmission rate than twisted pair.• Easy to install• High bandwidth• Excellent noise-immunity
Disadvantages
• Higher cost compared to twisted pair• Difficult to work with • Cable may easily get damaged
Fiber Optic Cable
• Consist of bundle of glass threads which is capable of transmitting messages modulated onto light waves
• Many extremely thin strands of glass or plastic bound together in a sheathing which transmit signals with light beams
• Can be used for voice, data and video systems
Advantages
• Greater capacity • Smaller size and weight• Thinner and lighter than metal wires• Lower noise• Data can be transmitted digitally rather than
analogically• Popular technology for LAN
Disadvantages
• Cables are expensive to install• More fragile than wire
Unguided Media
• In the form of radio signals, micro waves, infrared rays…
• Classified into 3
-Radio wave
-Microwave
-Infrared
Radio wave
Data signals are digitized and transformed into radio-frequency electromagnetic fields
Advantages
• Cheap form of communication• Far good for long distance
Disadvantages
• It has low frequency • It can't transmit a lot of data at one time.
Microwave
Information is converted to a microwave signal,
sent through the air to a receiver, and recorded.
Advantages
• Multiple channels available• Wide bandwidth
Disadvantages• Line-of-sight will be disrupted if any obstacle,
are in the way• Signal absorption by the atmosphere• Towers are expensive to build
Infrared
• This type of transmission uses infrared light to send data
• It transmits data through air and can propagate throughout a room, but will not penetrate walls.
• It is common in PDAs(Personal Digital Assistants)
• E.g. TV remotes, wireless speakers etc.,.
Advantages
• Inexpensive compared to other technologies• Works well over a short distance
Disadvantages• Low Bandwidth
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