File Name: types of communication cables and its specifications .zip
Before we dicuss Networking cables, let us know What actually Networking is? The network is the interconnection of the different systems and devices. In our daily life, we consist of a bunch of devices like desktop systems, mobile devices, laptops, Ipads, etc.
Universal Serial Bus USB is an industry standard that establishes specifications for cables and connectors and protocols for connection, communication and power supply interfacing between computers, peripherals and other computers. USB was designed to standardize the connection of peripherals to personal computers, both to communicate with and to supply electric power.
Timesheets Login Register. Tel : admin icobus. Toggle navigation menu.
An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current.
A cable assembly is the composition of one or more electrical cables and their corresponding connectors. Cable assemblies can also take the form of a cable tree or cable harness , used to connect many terminals together. The term cable originally referred to a nautical line of specific length where multiple ropes are combined to produce a strong thick line that was used to anchor large ships. As electric technology developed, people changed from using bare copper wire to using groupings of wires and various sheathing and shackling methods that resembled the mechanical cabling so the term was adopted for electrical wiring.
In the 19th century and early 20th century, electrical cable was often insulated using cloth, rubber or paper. Plastic materials are generally used today, except for high-reliability power cables. The term has also come to be associated with communications because of its use in electrical communications.
Electrical cables are used to connect two or more devices, enabling the transfer of electrical signals or power from one device to the other. Cables are used for a wide range of purposes, and each must be tailored for that purpose.
Cables are used extensively in electronic devices for power and signal circuits. Long-distance communication takes place over undersea cables. Power cables are used for bulk transmission of alternating and direct current power, especially using high-voltage cable. Electrical cables are extensively used in building wiring for lighting, power and control circuits permanently installed in buildings. Since all the circuit conductors required can be installed in a cable at one time, installation labor is saved compared to certain other wiring methods.
Physically, an electrical cable is an assembly consisting of one or more conductors with their own insulations and optional screens, individual covering s , assembly protection and protective covering s.
Electrical cables may be made more flexible by stranding the wires. In this process, smaller individual wires are twisted or braided together to produce larger wires that are more flexible than solid wires of similar size.
Bunching small wires before concentric stranding adds the most flexibility. Copper wires in a cable may be bare, or they may be plated with a thin layer of another metal, most often tin but sometimes gold , silver or some other material.
Tin, gold, and silver are much less prone to oxidation than copper, which may lengthen wire life, and makes soldering easier. Tinning is also used to provide lubrication between strands. Tinning was used to help removal of rubber insulation. Cables can be securely fastened and organized, such as by using trunking, cable trays , cable ties or cable lacing. Continuous-flex or flexible cables used in moving applications within cable carriers can be secured using strain relief devices or cable ties.
At high frequencies, current tends to run along the surface of the conductor. This is known as the skin effect. Any current -carrying conductor, including a cable, radiates an electromagnetic field. Likewise, any conductor or cable will pick up energy from any existing electromagnetic field around it. These effects are often undesirable, in the first case amounting to unwanted transmission of energy which may adversely affect nearby equipment or other parts of the same piece of equipment; and in the second case, unwanted pickup of noise which may mask the desired signal being carried by the cable, or, if the cable is carrying power supply or control voltages, pollute them to such an extent as to cause equipment malfunction.
The first solution to these problems is to keep cable lengths in buildings short since pick up and transmission are essentially proportional to the length of the cable. The second solution is to route cables away from trouble. Beyond this, there are particular cable designs that minimize electromagnetic pickup and transmission. Three of the principal design techniques are shielding , coaxial geometry, and twisted-pair geometry.
Shielding makes use of the electrical principle of the Faraday cage. The cable is encased for its entire length in foil or wire mesh. All wires running inside this shielding layer will be to a large extent decoupled from external electrical fields, particularly if the shield is connected to a point of constant voltage, such as earth or ground. Simple shielding of this type is not greatly effective against low-frequency magnetic fields, however - such as magnetic "hum" from a nearby power transformer.
A grounded shield on cables operating at 2. Coaxial design helps to further reduce low-frequency magnetic transmission and pickup. In this design the foil or mesh shield has a circular cross section and the inner conductor is exactly at its center. This causes the voltages induced by a magnetic field between the shield and the core conductor to consist of two nearly equal magnitudes which cancel each other.
A twisted pair has two wires of a cable twisted around each other. This can be demonstrated by putting one end of a pair of wires in a hand drill and turning while maintaining moderate tension on the line. Where the interfering signal has a wavelength that is long compared to the pitch of the twisted pair, alternate lengths of wires develop opposing voltages, tending to cancel the effect of the interference.
In building construction , electrical cable jacket material is a potential source of fuel for fires. To limit the spread of fire, one may use cable coating materials or jacketing that is fire retardant. The plastic covering on some metal clad cables may be stripped off at installation to reduce the fuel source for fires.
Inorganic coatings and boxes around cables safeguard the adjacent areas from the fire threat associated with unprotected cable jacketing. However, this fire protection also traps heat generated from conductor losses, so the protection must be thin. To provide fire protection to a cable, the insulation is treated with fire retardant materials, or non-combustible mineral insulation is used see Mineral-insulated copper-clad cable. Hybrid optical and electrical cables can be used in wireless outdoor fiber-to-the-antenna FTTA applications.
In these cables, the optical fibers carry information, and the electrical conductors are used to transmit power. These cables can be placed in several environments to serve antennas mounted on poles, towers or other structures. Local safety regulations may apply. From Wikipedia, the free encyclopedia. Assembly of one or more wires running side by side or bundled.
For other uses, see Cable disambiguation. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. August Learn how and when to remove this template message. This section needs additional citations for verification. Retrieved 1 July What is BX? When should I use each?
Authority control NDL : Categories : Cables Electrical wiring. Hidden categories: Articles with short description Short description is different from Wikidata Articles needing additional references from September All articles needing additional references Articles needing additional references from August Wikipedia articles needing clarification from May Commons category link is on Wikidata Wikipedia articles incorporating citation to the NSRW Wikipedia articles incorporating citation to the NSRW with an wstitle parameter Wikipedia articles with NDL identifiers.
Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Wikimedia Commons. Look up cable in Wiktionary, the free dictionary. Wikimedia Commons has media related to Electric cables.
An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current. A cable assembly is the composition of one or more electrical cables and their corresponding connectors. Cable assemblies can also take the form of a cable tree or cable harness , used to connect many terminals together. The term cable originally referred to a nautical line of specific length where multiple ropes are combined to produce a strong thick line that was used to anchor large ships. As electric technology developed, people changed from using bare copper wire to using groupings of wires and various sheathing and shackling methods that resembled the mechanical cabling so the term was adopted for electrical wiring. In the 19th century and early 20th century, electrical cable was often insulated using cloth, rubber or paper.
While selecting the cable, a type of data transfer, purpose, advantages, and disadvantages taken into consideration. Twisted pair cables consist of color-coded pairs of insulated copper wires, one wire carries the signal, and the other is used for ground reference. Every two wires are twisted around each other to form pairs that are encased in a plastic sheath each wire with a diameter of 0. The number of pairs varies depending on the cable type. More twists per foot in a pair of wires, less the cross talk. The significance of twisting is it reduces or nullifies the interference such as noise or cross talk caused due to radiofrequency of electromagnetic interference.
Network cable acts like a medium through which information travels from one network device to the other. The various types of network cables act as the backbone of the network infrastructure. Selecting the correct type of network cabling can effect various business functions because enterprise network admins employ new technologies. The type of network cable used in any network infrastructure is one of the most vital aspect of networking in various industries. It has a single copper conductor in the middle.
This tutorial explains the types of network cables used in computer networks in detail. Learn the specifications, standards, and features of the coaxial cable, twisted-pair cable, and the fiber-optical cable. To connect two or more computers or networking devices in a network, network cables are used. There are three types of network cables; coaxial, twisted-pair, and fiber-optic. This cable contains a conductor, insulator, braiding, and sheath.
Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair , a twisted pair reduces electromagnetic radiation from the pair and crosstalk between neighboring pairs and improves rejection of external electromagnetic interference. It was invented by Alexander Graham Bell.
Cable is the medium through which information usually moves from one network device to another. There are several types of cable which are commonly used with LANs. In some cases, a network will utilize only one type of cable, other networks will use a variety of cable types. The type of cable chosen for a network is related to the network's topology, protocol, and size. Understanding the characteristics of different types of cable and how they relate to other aspects of a network is necessary for the development of a successful network. The following sections discuss the types of cables used in networks and other related topics.
The copper wire or copper alloy wires are available in different versions depending on the particular specification. The insulated cover- ing can be manufactured.
Я рада, что поймала тебя, - продолжала. - Мне нужен совет. Джабба встряхнул бутылочку с острой приправой Доктор Пеппер. - Выкладывай. - Может быть, все это чепуха, - сказала Мидж, - но в статистических данных по шифровалке вдруг вылезло что-то несуразное.
То, что она увидела пониже его живота, оказалось совсем крошечным. Немец схватил ее и нетерпеливо стянул с нее рубашку. Его толстые пальцы принялись методично, сантиметр за сантиметром, ощупывать ее тело. Росио упала на него сверху и начала стонать и извиваться в поддельном экстазе. Когда он перевернул ее на спину и взгромоздился сверху, она подумала, что сейчас он ее раздавит.
ГЛАВА 118 - Это может служить доказательством, - решительно заявил Фонтейн. - Танкадо избавился от кольца. Он хотел, чтобы оно оказалось как можно дальше от него - чтобы мы его никогда не нашли. - Но, директор, - возразила Сьюзан, - это не имеет смысла. Если Танкадо не понял, что стал жертвой убийства, зачем ему было отдавать ключ. - Согласен, - сказал Джабба. - Этот парень был диссидентом, но диссидентом, сохранившим совесть.
Хейл находился всего в метре от нее, когда она встала и преградила ему дорогу.
Он печально на нее посмотрел. - Мидж… у меня нет никакой жизни. Она постучала пальцем по кипе документов: - Вот твоя жизнь, Чед Бринкерхофф. - Но, посмотрев на него, смягчилась.
Я хотел уйти с сознанием, что добился своей цели. - Но вы добились своей цели, - словно со стороны услышала Сьюзан собственный голос, - Вы создали ТРАНСТЕКСТ. Казалось, Стратмор ее не слышал.
Беккер убрал блокнот и ручку. Игра в шарады закончилась. Дело принимает совсем дурной оборот.
Есть математическая гарантия, что рано или поздно ТРАНСТЕКСТ отыщет нужный пароль. - Простите. - Шифр не поддается взлому, - сказал он безучастно. Не поддается. Сьюзан не могла поверить, что это сказал человек, двадцать семь лет работавший с шифрами.
Тот факт, что в лаборатории систем безопасности никого нет, а монитор был выключен, больше не имело значения. Главное теперь - сам ТРАНСТЕКСТ.
12th economics book in tamil pdf anna dressed in blood pdf free download