Point-to-point (telecommunications)

Point-to-point (telecommunications)

Point-to-point telecommunications generally refers to a connection restricted to two endpoints, usually host computers.

Point-to-point is sometimes referred to as P2P, or Pt2Pt, or variations of this. Among other things, P2P also refers to peer-to-peer file sharing networks.

Point-to-point is distinct from point-to-multipoint where point-to-multipoint also refers to broadcast or downlink.

Basic point-to-point data link

A traditional point-to-point data link is a communications medium with exactly two endpoints and no data or packet formatting. The host computers at either end had to take full responsibility for formatting the data transmitted between them. The connection between the computer and the communications medium was generally implemented through an RS-232 interface, or something similar. Computers in close proximity may be connected by wires directly between their interface cards.

When connected at a distance, each endpoint would be fitted with a modem to convert analog telecommunications signals into a digital data stream. When the connection used a telecommunications provider, the connections were called a dedicated, leased, or private line. The ARPANET used leased lines to provide point-to-point data links between its packet-switching nodes, which were called Interface Message Processors.

Modern point-to-point links

More recently (2003), the term point-to-point telecommunications relates to wireless data communications for Internet or Voice over IP via radio frequencies in the multi-gigahertz range. It also includes technologies such as laser for telecommunications but in all cases expects that the transmission medium is line of sight and capable of being fairly tightly beamed from transmitter to receiver.

The telecommunications signal is typically bi-directional, either "time division multiple access" (TDMA) or channelized.

In hubs and switches, a hub provides a point-to-multipoint (or simply multipoint) circuit which divides the total bandwidth supplied by the hub among each connected client node. A switch on the other hand provides a series of point-to-point circuits, via microsegmentation, which allows each client node tohave a dedicated circuit and the added advantage of having full-duplex connections.

Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Point-to-multipoint communication — is a term that is used in the telecommunications field which refers to communication which is accomplished via a specific and distinct type of one to many connection, providing multiple paths from a single location to multiple locations.[1] Point …   Wikipedia

  • Point-to-point — (also point to point) may refer to: * Point to point (telecommunications) * Point to point construction, an electronics assembly technique * SAN Point to Point, a topology used in Fibre Channel * Point to point racing * Point to point transit, a… …   Wikipedia

  • Point-to-multipoint communication (telecommunications) — For general information for point to multipoint communication, refer to point to multipoint link.Point to multipoint communication is a term that is used in the telecommunications field which refers to communication which is accomplished via a… …   Wikipedia

  • TÉLÉCOMMUNICATIONS - Téléphonie et télégraphie — La transmission de la parole est un désir naturel de l’homme, mais il fallut les découvertes du XIXe siècle sur les phénomènes et les lois de l’électromagnétisme pour que la voix humaine puisse être convenablement transmise et reproduite à… …   Encyclopédie Universelle

  • Telecommunications — Télécommunications Alexander Graham Bell Les télécommunications sont définies comme la transmission à distance d’informations avec des moyens à base d électronique et d informatique. Ce terme a un sens plus large que son acception équivalente… …   Wikipédia en Français

  • TÉLÉCOMMUNICATIONS - Télécommunications audiovisuelles — Si le téléphone n’est pas considéré aujourd’hui comme étant du domaine audiovisuel, ce ne fut pas le cas dans le passé, ce ne le sera pas davantage demain. En effet, les caractéristiques techniques du service de la communication téléphonique sont …   Encyclopédie Universelle

  • TÉLÉCOMMUNICATIONS - Transmissions optiques — Le développement des télécommunications s’est caractérisé par l’utilisation d’un domaine de fréquences de plus en plus vaste, depuis les quelques kilohertz des premières lignes téléphoniques jusqu’à la centaine de gigahertz des guides d’ondes… …   Encyclopédie Universelle

  • Telecommunications engineering — Telecommunications engineering, or telecom engineering, is a major field within electronic engineering. The work ranges from basic circuit design to strategic mass developments. A telecommunication engineer is responsible for designing and… …   Wikipedia

  • TÉLÉCOMMUNICATIONS - La révolution numérique — En France, à partir de 1970, la technique dite numérique a été introduite dans les centraux téléphoniques et les systèmes de transmission sur câbles puis sur faisceaux hertziens (liaisons radioélectriques à très hautes fréquences) pour remplacer… …   Encyclopédie Universelle

  • Telecommunications Engineer — Telecommunications Engineers or Telecom Engineers come in a variety of different types from basic circuit designers to strategic mass developments. A Telecom Engineer is responsible for designing and overseeing the installation of… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”