Explain the characteristics of the popular guided transmission media: Transmission media can be defined as physical path between transmitter and receiver in. The transmission media that are used to convey information can be classified as guided or unguided. Guided media provide a physical path along which the. Transmission Media. – Physical path between transmitter and receiver. – Guided or unguided (wireless). – Communication is in the form of electromagnetic.
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PDF | Transmission media are the physical pathways (guided or unguided) that connect computers, other devices, and people on a network. Computers and. Electromagnetic Spectrum. ❑ Transmission Media: Twisted Pair, Coax, fiber, wireless. ❑ Unshielded Twisted Pair (UTP) categories. ❑ Reflection and Refraction. Chapter 4: Transmission Media. CS/ Axel Krings. Sequence 4. Page 2. Overview. • Guided - wire. • Unguided - wireless. • Characteristics and quality.
Like the length of the conductor, its installation cost, its maintenance, etc. The guided media is categorized further into three categories that are twisted-pair cable, coaxial cable and fiber-optic cable.
The twisted pair cable has two conductors wires wounded around each other and each surrounded by an insulating material. The twisted pair cable is flexible and easy to install. But it has low bandwidth and provide less protection from interference. Twisted pair cable are also of two types shielded and unshielded twisted pair cable.
The coaxial cable has a central core conductor usually copper enclosed in an insulating sheath, which is further encased in an outer metallic braid, it serves as both protection against noise and as a second conductor which completes the circuit. Now, the outer metallic covering is also covered by an insulating sheath. The coaxial cable carries signals of higher frequency than the twisted pair cable. The third category is the optical fibre which is made of glass or plastic, and it transmits signals in the form of light.
The optical fibre is noise resistance, has less signal attenuation and has a higher bandwidth in comparison to twisted pair cable and coaxial cable. But it also has some drawbacks like; it is very expensive, it requires a lot of installation and maintenance charge as any defect in the cable can diffuse light and alter the signals.
As the optical fibre is made of glass, it is very fragile.
So, we have discussed the major categories of guided media lets move on to unguided media. Definition of Unguided Media The unguided media is also called wireless communication. It does not require any physical medium to transmit electromagnetic signals.
In unguided media, the electromagnetic signals are broadcasted through air to everyone. Generally color coded twisted pairs of insulated copper wires encased in plastic sheath Each wire has a diameter of 0. Various purposes Designs vary in twist ratio, grade of copper used, type of shielding. Modern networks use 4 pairs packed in together.
Topic 7 - Guided Transmission Media.pdf
Sumati J. Twisted pair is Relatively inexpensive Flexible Easy to install Span significant distance before needing a repeater Easily accommodates different topologies. Consists of twisted wire pairs that are not only individually insulated, but also surrounded by a shielding made of a metallic substance such as foil.
Sometimes braided copper shielding Acts as barrier to external EM forces. Twisted wire pairs insulated individually covered in a plastic sheath No additional shielding Less expensive Less resistant to noise.
Cat 3 jacket is loose than Cat 5 Cat 5 can support only a small amount of untwisting before termination. Sumati Cat 5 provides better throughput. Cost STP is generally more expensive and also requires grounding and installation charges.
UTP 6 is costly too. Throughput Ranges from 10 to Mbps depending on type of wire. On Ethernet support 1 Mbps to 10 Gbps with max nodes. Impedance of 75 ohms contains an 18 AWG conducting core. F-type Attach in a way so that the pin in the center of the connector is the conducting core of the cable Compressed to attach to cable, connectors are threaded and screw together like a nut and bolt assembly Mostly used for RG It is used to help shield the cable from electromagnetic interference, or EMI.
Wrapped outside the copper mesh is the final non-conductive protective cover. The actual data travels through the center conductor in the cable.
EMI is "caught", or redirected, by the outer copper mesh. There are different types of coaxial cable that vary by gauge and impedance. Gauge is the measure of the cable thickness. It is measured by the radio guide measurement or RG number.
The higher the RG number, the thinner the central core conductor.It comes in two modes, one is single mode fiber and second is multimode fiber.
Bluetooth is only available to the personal area networks in an office or a home network. The values found for satellite extreme higher than the other media, so it was neglected in comparison.
But it has low bandwidth and provide less protection from interference. Bounded media are great for in-lab communications because they offer high speeds, are more secure than unbounded media and are low-cost.
Difference Between Guided and Unguided Media
Light is kept in the core by the phenomenon of total internal reflection which causes the fiber to act as a waveguide. It reduces the usage of power as compared to the Wi-Fi. For example, a bank has to handle and transfer huge data of its customer, which stores a backup of it at some geographically far-away place for security reasons and to keep it from uncertain calamities.
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