Radio spectrum. Radio spectrum refers to the part of the electromagnetic spectrum corresponding to radio frequencies – that is, frequencies lower than around 300 GHz (or, equivalently, wavelengths longer than about 1 mm). Electromagnetic waves in this frequency range, called radio waves, are used for radio communication and various other applications, such as heating. The generation of radio waves is strictly regulated by the government in most countries, coordinated by an international standards body called the International Telecommunications Union (ITU). Different parts of the radio spectrum are allocated for different radio transmission technologies and applications. In some cases, parts of the radio spectrum is sold or licensed to operators of private radio transmission services (for example, cellular telephone operators or broadcast television stations).
Ranges of allocated frequencies are often referred to by their provisioned use (for example, cellular spectrum or television spectrum).[1] Www.radiofrekvenser.com. Frekvensoversikter - Norkring. List of device bandwidths. This is a list of device bit rates, or physical layer information rates, net bit rates, useful bit rates, peak bit rates or digital bandwidth capacity, at which digital interfaces of computer peripheral equipment and network devices can communicate over various kinds of buses and networks. Bar chart of common computer interface speeds The distinction can be arbitrary between a bus, (which is inside a box and usually relies on many parallel wires), and a communications network cable, (which is external, between boxes and rarely relies on more than four wires).
Many device interfaces or protocols (e.g., SATA, USB, SCSI, PCI and a few variants of Ethernet) are used both inside many-device boxes, such as a PC, and one-device-boxes, such as a hard drive enclosure. Accordingly, this page lists both the internal ribbon and external communications cable standards together in one sortable table. Factors limiting actual performance, criteria for real decisions[edit] Conventions[edit] Bandwidths[edit] Radiofrekvens. Radiofrekvens angis i antall hertz (Hz) (svingninger per sekund). Det er vanlig å bruke følgende klassifikasjon eller gruppeinndeling av frekvens- og bølgebånd: Radio.