Memory module is a broad term, and could refer to these specific types of memory module:
§ SO-DIMM, Small outline DIMM, a smaller version of the DIMM, used in laptops
A real-time clock (RTC) is acomputer clock (most often in the form of an integrated circuit) that keeps track of the current time. Although the term often refers to the devices inpersonal computers, servers and embedded systems, RTCs are present in almost any electronic device which needs
The public switched telephone network (PSTN) is the network of the world's public circuit-switchedtelephone networks, in much the same way that the Internet is the network of the world's public IP-basedpacket-switched networks. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital, and now includes mobile as well as fixed telephones.
The PSTN is largely governed by technical standards created by the ITU-T, and uses E.163/E.164addresses (more commonly known as telephone numbers) for addressing.
Telecommunication is the assisted transmission of signals over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags, or heliograph. In modern times, telecommunication typically involves the use of electronic transmitters such as the telephone, television, radio or computer. Early inventors in the field of telecommunication include Alexander Graham Bell, Guglielmo Marconi and John Logie Baird. Telecommunication is an important part of the world economy.
Mobile computing is a generic term describing one's ability to use technology while moving, as opposed to portable computers, which are only practical for use while deployed in a stationary configuration.
Many types of mobile computers have been introduced since the 1990s, including the:
An optical fiber (or fibre) is a glass or plastic fiber that carries light along its length. Fiber optics is the overlap of applied science and engineering concerned with the design and application of optical fibers. Optical fibers are widely used in fiber-optic communications, which permits transmission over longer distances and at higher data rates (a.k.a "bandwidth"), than other forms of communications. Fibers are used instead of metal wires because signals travel along them with less loss, and they are immune to electromagnetic interference. Optical fibers are also used to form sensors, and in a variety of other applications.
Light is kept in the "core" of the optical fiber by total internal reflection. This causes the fiber to act as a waveguide. Fibers which support many propagation paths or transverse modes are called multimode fibers (MMF). Fibers which support only a single mode are called singlemode fibers (SMF). Multimode fibers generally have a large-diameter core, and are used for short-distance communication links or for applications where high power must be transmitted. Singlemode fibers are used for most communication links longer than 200 meters.
Joining lengths of optical fiber is more complex than joining electrical wire or cable. The ends of the fibers must be carefully cleaved, and then spliced together either mechanically or by fusing them together with an electric arc. Special connectors are used to make removable connections.
Most high speed internet cable connections are made up of optical fiber cables.
A computer network is a group of interconnected computers. Networks may be classified according to a wide variety of characteristics. This article provides a general overview of some types and categories and presents the basic components of a network.
Network Classification
Computer networks can also be classified according to the hardware technology that is used to connect the individual devices in the network such as Optical fibre , Ethernet , Wireless LAN , HomePNA , or Power line communication.
Ethernet uses physical wiring to connect devices. Often deployed devices are hubs, switches, bridges, and/or routers.
Wireless LAN technology is designed to connect devices without wiring. These devices use radio wavesas transmission medium.
