This article is about transmission of signals. For biological transmission, see Vector (molecular biology).
Cutaway diagram of Coaxial cable, one example of a transmission medium
A transmission medium is a system or substance that can mediate the propagation of signals for the purposes of telecommunication. Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound, and a transmission medium for sounds may be air, but solids and liquids may also act as the transmission medium. Vacuum or air constitutes a good transmission medium for electromagnetic waves such as light and radio waves. While a material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media they pass through, for instance, by absorption or reflection or refraction at the interfaces between media. Technical devices can therefore be employed to transmit or guide waves. Thus, an optical fiber or a copper cable is used as transmission media.
Electromagnetic radiation can be transmitted through an optical medium, such as optical fiber, or through twisted pair wires, coaxial cable, or dielectric-slab waveguides. It may also pass through any physical material that is transparent to the specific wavelength, such as water, air, glass, or concrete. Sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. Historically, science incorporated various aether theories to explain the transmission medium. However, it is now known that electromagnetic waves do not require a physical transmission medium, and so can travel through the vacuum of free space. Regions of the insulative vacuum can become conductive for electrical conduction through the presence of free electrons, holes, or ions.
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A transmissionmedium is a system or substance that can mediate the propagation of signals for the purposes of telecommunication. Signals are typically...
for interaction with the wired (electrical or optical) or wireless transmissionmedium. The MAC sublayer and the logical link control (LLC) sublayer together...
deliver information or data Medium of instruction, a language or other tool used to educate, train, or instruct Transmissionmedium, in physics and telecommunications...
channel refers either to a physical transmissionmedium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel in telecommunications...
for example, one analog-to-digital converter or one communications transmissionmedium, instead of having one device per input signal. Multiplexers can...
radio, such as cell phones, Transmissionmedium over which the signal is transmitted. For example, the transmissionmedium for sounds is usually air, but...
provides an electrical, mechanical, and procedural interface to the transmissionmedium. The shapes and properties of the electrical connectors, the frequencies...
Computer networks may be classified by many criteria, including the transmissionmedium used to carry signals, bandwidth, communications protocols to organize...
optics, an optical medium is material through which light and other electromagnetic waves propagate. It is a form of transmissionmedium. The permittivity...
external clock, while asynchronous transmissions are synchronized by special signals along the transmissionmedium. Whenever an electronic device transmits...
much of a wave is reflected by an impedance discontinuity in the transmissionmedium. It is equal to the ratio of the amplitude of the reflected wave...
topologies. The transmissionmedium layout used to link devices is the physical topology of the network. For conductive or fiber optical mediums, this refers...
sound is a vibration that propagates as an acoustic wave through a transmissionmedium such as a gas, liquid or solid. In human physiology and psychology...
either a transmissionmedium or data storage medium. The most common physical channels are: the line-coded signal can directly be put on a transmission line...
throughout electronics, and particularly in radio frequency circuit design, transmission line and antenna theory and design. Electrical length determines when...
107 Gbit/s, for a total transmission of 64 Tbit/s. In 2018, Telstra of Australia deployed a live system that enables the transmission of 30.4 Tbit/s per fiber...
transmission in Wiktionary, the free dictionary. Transmit or Transmission may refer to: Power transmission Electric power transmissionTransmission (mechanical...
simultaneous frequencies, and is used in fast Internet access. The transmissionmedium can be coaxial cable, optical fiber, wireless Internet (radio), twisted...
signals. These paths of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent...
combined into one signal over a shared medium. The aim is to share a scarce resource – a physical transmissionmedium.[citation needed] For example, in telecommunications...
considered inherently unreliable at any single network element or transmissionmedium and is dynamic in terms of the availability of links and nodes. No...
propagation (VoP or v P {\displaystyle v_{\mathrm {P} }} ), of a transmissionmedium is the ratio of the speed at which a wavefront (of an electromagnetic...
colors, and images. Contemporarily, "document" is not defined by its transmissionmedium, e.g., paper, given the existence of electronic documents. "Documentation"...
total transmission power, reduces power handling requirements of line repeaters, and permits better bandwidth utilization of the transmissionmedium. AM...
transporting the matter in the transmissionmedium if there is one. Electromagnetic waves are transverse without requiring a medium. The designation “transverse”...
addition to the physical format used by the data storage device or transmissionmedium, the stream of ones and zeros that is sent must be in a particular...
type of guided transmissionmedium. Telecommunications are based on transmitting and receiving modulated waves/signals through a medium. Types of telecommunications...
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