Cables are assemblies of one or more conductors, wires, or optical fibers within an enveloping sheath. There're many types of cables which include arresting cable, bowden cable, communications cable, coaxial cable, fiber optic cable, heliax cable, insulated cable, mechanical cable, shielded cable, twinax cable, twisted pair cable, wire cable (wire rope), and computer cable. Coaxial cables are used to carry signals between various electronic devices such as signals are televisions, displays, computers, CRT displays, transceivers, computer stations on a computer network. A power cable and electrical cable is a long, cylindrically symmetric structure with a dielectric which operates at relatively high electrical stress. Power cables typically include one or more electrical conductors, several layers of polymeric materials. Ribbon cables are used for conducting a plurality of electrical signals. Fiber optic cables are extremely thin and flexible and are capable of transmitting voice, video, and data signals in either analog or digital formats. Fiber optic cable provides higher quality data transmission over longer distances with less chance of interference than copper wire. Communications cables, such as cables used in telephone lines, typically consist of insulated copper cores. Cable connectors are used for electrical and mechanical connection to physically and electrically connect one or more conductors. Coaxial connectors are used to connect cables to respective terminals on electrical equipment and related housings, as well as to other cables. Subminiature coaxial connectors are used with microwave active and passive components, high-end radio electronics, instrumentation applications and avionics. Electrical connectors are used to provide a separable path for electric current to flow between components of an electrical system. Electronics connectors in the computer and communications industry are available for a wide array of applications from communications and data transfer applications to power connections. A USB (universal serial bus) connector is a standard data transmission media for transferring power, data and other electrical signals used in communication products, particularly desktop computers and laptop computers and the related peripherals.
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Sunday, 21 January 2007 |
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Typical electrical power transmission systems may include cables, conduits, cable trays, junction boxes, hangars, thermal shorts, condulets, transmission lines, and other electrical transmission devices associated with the transmission of electricity and electrical signals. In the transmission of electrical power or signals, it is a conventional practice to house the electrical transmission wire or cable in plastic or metal electrical conduits. Electrical conduits are typically identified as electrical metallic tubing (EMT), ridge metal conduit (RMC), intermediate metal conduit (IMC) and aluminum ridged conduit (ALRC) conduits. Flexible electrical conduit is frequently used in residential and commercial electrical wiring because of the versatility imparted by the flexible nature of the conduit. |
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Tuesday, 16 January 2007 |
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A flexible flat cable (FFC) is composed of a plurality of conductors disposed parallel in the longitudinal direction, which are insulated and coated in an electrically independent state. These cables are produced by extruding the plastics casing material simultaneously around all the conductors. Sometimes the plastics casing material is applied to conductors that are already insulated. The FFC is characterized by excellent flexibility, capability for being bent, and easy formation of multiple cores. Flat flexible cables are used as flexible printed circuits (FPC) to connect printed circuit boards for interconnecting rows of terminals of PCBs arranged in a confined space inside an electronic device, such as a personal computer or a mobile phone, for reducing the overall size of the electronic device. |
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Tuesday, 09 January 2007 |
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High voltage cables are used to transmit substantial quantities of electrical power either above ground or underground. These power cables have essentially the same cable configurations, consisting of the conductor, strand shield, insulation, insulation shield system and jacket. A high voltage cable generally comprises a central copper conductor having a diameter which may vary from a few millimeters to a few centimeters. Around the conductor an internal semiconductive layer is present which consists of a polythene insulation sheath. Around this insulation sheath there is provided an external semiconductor screen of usually the same composition as the internal layer. The purpose of semiconductor layers is to influence the electric field strength within the insulation layer. |
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Wednesday, 03 January 2007 |
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Optical fibers are used in data transmission applications because of their wide bandwidth and large capacity for carrying information in the form of light waves that are basically unaffected by electromagnetic fields. Fiber optic cables allow information signals to be transmitted from one point to another using light signals carried on a single glass fiber. Fiber optic connectors terminate optical fiber cables and facilitate connection of the cables to other cables or other optical fiber transmission devices. The fiber optic networks incorporate a number of remateable connectors instead of permanent splices in order to provide flexibility in revising or upgrading the networks. A typical fiber optic connector includes a ferrule which mounts and positions an optical fiber or fibers within the connector. |
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Sunday, 17 December 2006 |
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A small computer standard interface (SCSI) specification defines a number of parameters to interface peripheral devices to computer systems. A SCSI cable is connected to a SCSI controller connector located on the backside of the computer case. The other end of the SCSI cable has a connector that couples to the SCSI peripheral device. A terminator is a device adapted to connect to a SCSI bus cable or SCSI port of a SCSI device. The terminator includes a series of resisters that absorb electrical signals passed on the wires of the SCSI cable. A SCSI board or backplane may be coupled to the system board through the expansion slots and one or more cables. A ribbon cable with a plurality of IDC header connectors is often used for daisy-chaining multiple SCSI devices. |
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Monday, 11 December 2006 |
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A printed circuit board is designed to receive separately manufactured electrical components and to interconnect those components in an overall circuit structure. Electrical connectors are mounted to printed circuit boards, such as by right angled mounting, for electrical connection to circuit traces on the boards. A typical electrical connector includes some form of dielectric or insulative housing which mounts a plurality of conductive terminals. A wide variety of electrical connectors are designed for mounting to printed circuit boards. Electrical connectors for mounting to printed circuit boards have contact leads that extend through plated through holes or have leads that engage contact pads on the surface of the circuit board. Edge card connectors electrically connect a daughter board to a mother board. |
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Monday, 04 December 2006 |
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Fiber optic cables are used in the telecommunications industry to transmit information at very high rates over long distances. Transmission of information using fiber optics is achieved using light pulses that traverse along a glass or optical fiber. Fiber optic cables include a plurality of optical fibers housed within one or more protective layers. Fiber optic cables provide numerous advantages over traditional communication cables, particularly higher transmission speeds and improved transmission quality. Fiber optic systems provide higher bandwidth and greater performance and reliability than standard copper-wired systems. Fiber optic connectors are employed to terminate optical fiber cables and to facilitate connection of the cables to other cables or other optical fiber transmission devices. |
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Monday, 20 November 2006 |
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Coaxial connectors are employed to join one coaxial cable to another or to join a coaxial cable to an appropriate electrical circuit. Microwave signals are often carried on shielded coaxial cables which are used to transmit microwave signals to and from various end devices. SMA (subminiature series A) connectors are coaxial RF connectors used with microwave active and passive components, high-end radio electronics, instrumentation applications and avionics. SMA connectors generally include a center pin having a tab on its inner end and a female recess on its opposite end. SMA connector is available both in standard and reverse polarity forms. Standard SMA connectors utilize a threaded coupling or locking nut as the locking mechanism to connect the male and female connectors. |
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Monday, 13 November 2006 |
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Electrical connectors provide couplings between electronic elements and/or devices. RF (radio frequency) connectors are one type of commonly used electrical connectors. Bayonet Neill Concelman (BNC) connectors are RF electrical connectors used for terminating coaxial cable. Bayonet mechanisms are one way of securing such removable RF electrical connectors. A typical BNC connector may comprise a female connector assembly and a male connector assembly that are designed to be engaged and disengaged with each other. BNC coaxial connectors are commonly-used in the electronics industry for coupling low voltage signals to a measurement instrument. The BNC connector, besides its original 50 ohm configuration, has a 75 ohm version widely used in the telecommunications industry. |
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Friday, 03 November 2006 |
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Universal serial bus (USB) is an interface that supports serial data transfers between a host computer and a wide range of simultaneously accessible peripherals. The USB specification allows peripherals to be attached, configured, used and detached while the host and other peripherals are in operation. A USB cable is used for connecting the personal computer having the USB interface to the peripheral device. The USB cable is a four wire cable, two of them are used for a power source and the others are used for a data signal. The maximum cable length is about 5 meters. USB cables can be used to connect printers, scanners, mice, joysticks, digital cameras, MP3 players, web cams, modems, speakers, telephones and many other devices to an electronic device for interaction with the device. |
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Sunday, 22 October 2006 |
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Video cables are used to convey electronic video signals from a source device to a destination, typically a display device. A video cable is required to transmit signals in such states that the transmission signals are prevented from being attenuated and major frequency components of the signals to be transmitted are faithfully maintained, in order to increase the transmission efficiency of signals transmitted by the cable. Video may be transmitted either in digital or analog formats. Signal degradation is usually caused by cable impedance. High impedance cables can reduce received signal strength, and thereby degrade overall system performance. A coaxial cable is typically used for transmission of high resolution video because of its superior performance over twisted pair cable. |
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Saturday, 14 October 2006 |
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Computer cables are used for transferring information between computers and other electrical systems. In a personal computer, cable assemblies are used for many purposes including power distribution, low speed signal communication, and high speed signal communication. A typical computer includes a plurality of input and output cables coupled to a back panel of the server, including power cables, data cables, communication lines, and keyboard lines, etc. Cables are used to connect the monitor, printer, speakers and input devices to the processor housing. Typical cables used for cabling computer components are made up of a plurality of electrical conductors. A universal aerial bus (USB) cable is used to electrically connect a computer and other peripherals such as keyboard, mouse, and printer. |
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Wednesday, 04 October 2006 |
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Power supplies typically convert a power input signal into a necessary or desirable power output signal tailored for a specific application. Many electrical devices receive electrical power by having a cord or cable connected to a plug, which is inserted into an electrical socket. Electrical extension cords are commonly used to supply electrical power to tools and equipment which are remote from electrical outlets and power sources. Retractable electrical extension cord allows the cord to be extended only to the degree desired. Power cords are generally small, flexible electrical cables having a plug on at least one end which is used to connect an appliance with a wall outlet or receptacle. Circuit breakers are provided along the current path to protect the load against overcurrent conditions. |
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Sunday, 17 September 2006 |
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Universal serial bus (USB) connectors are now widely used as a standard digital transmission serial bus. Universal serial bus is a data transmission standard for connections between devices with USB connectors, such as pen drives, removable hard drives, digital cameras, mice, keyboards, scanners, and printers. The USB specification supports four basic types of data transfers: control transfers, bulk transfers, interrupt transfers and isochronous transfers. The USB interface has many advantages, such as high speeds, easy connections, plug-and-play possible, no need for any external power, supporting many devices, and highly compatible. Almost every computer is equipped with two or more USB female sockets. The peripheral apparatus of the computer is mainly equipped with the USB male plug. |
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Wednesday, 06 September 2006 |
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In audio systems, electrical cables are used to carry signals from one component to another, such as from a CD player to an audio preamplifier, or from a preamplifier to a power amplifier. Audio cables transmit different frequency signals within the audio frequency range at different velocities of propagation. Interference may be directly audible or may enter amplifiers through feedback loops from either the input or output terminals. Skin-effect can cause the music signal to become attenuated and distorted or smeared. Audio signal cables are required to support fine dynamics, separation, rich overtones, presence and musicality. Audio cable is an integral component of a high quality or high-end audio system rather than merely a sonically neutral link between equipment. |
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Monday, 28 August 2006 |
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Electrical connectors are used to connect different electrical devices to make the electrical devices electrically connected. Electrical connectors are typically used to connect multiple electrical devices such that the electrical devices may electrically communicate. Electrical connectors are used within many systems, such as personal computers, industrial systems, networks and power supplies. A typical electrical connector includes some form of insulating or dielectric housing having an opening or receptacle for receiving a complementary mating connector or other mating connecting device. Electrical connectors are provided in many different varieties for numerous applications. Electrical connectors are widely used in personal computer systems to electrically connect a plurality of wires. |
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Tuesday, 15 August 2006 |
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Coaxial cables are transmission lines in which an inner conductor is surrounded by an outer conductor or shield and separated by nonconductive dielectric materials. The use of coaxial cable has become more prevalent in communications and other systems because of its advantages over other wire systems. Coaxial cables are widely employed today to carry signals between various electronic devices such as televisions, displays, computers, CRT displays, transceivers, computer stations on a computer network, etc. Coaxial cables are often used for the transmission of telecommunications signals. A typical coaxial cable generally consists of a centrally located electrical conductor, usually made of copper, which is surrounded by a first dielectric insulator or sheath. Coaxial cables are particularly suited for efficient operation in the HF (high frequency) and UHF (ultra high frequency) regions of the electromagnetic spectrum. A coaxial cable has excellent interference suppression properties due to its structure. |
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Cables and Connectors
