In telecommunications, a point-to-point connection refers to a communications connection between two nodes or endpoints. An example is a telephone call, in which one telephone is connected with one other, and what is said by one caller can only be heard by the other. This is contrasted with a point-to-multipoint or broadcast communication topology, in which many nodes can receive information transmitted by one node. Other examples of point-to-point communications links are leased lines, microwave relay links, and two way radio. Examples of point-to-multipoint communications systems are radio and television broadcasting.
The term is also used in computer networking and computer architecture to refer to a wire or other connection that links only two computers or circuits, as opposed to other network topologies such as buses or crossbar switches which can connect many communications devices.
Point-to-point is sometimes abbreviated as P2P, Pt2Pt. This usage of P2P is distinct from P2P referring to peer-to-peer file sharing networks.
One-to-one or one to one may refer to:
Mathematics
Entertainment
Other
See also
In systems analysis, a one-to-one relationship is a type of cardinality that refers to the relationship between two entities (see also entity–relationship model) A and B in which one element of A may only be linked to one element of B, and vice versa. For instance, think of A as countries, and B as capital cities. A country has only one capital city, and a capital city is the capital of only one country
In a relational database, a one-to-one relationship exists when one row in a table may be linked with only one row in another table and vice versa. It is important to note that a one-to-one relationship is not a property of the data, but rather of the relationship itself. A list of mothers and their children may happen to describe mothers with only one child, in which case one row of the mothers table will refer to only one row of the children table and vice versa, but the relationship itself is not one-to-one, because mothers may have more than one child, thus forming a one-to-many relationship.
One to One is an Irish television series which airs on RTÉ One. Since the first edition was broadcast at 12:15pm on 1 October 2006, the programme has featured personal interviews with a well-known figure from Ireland and abroad, one per episode. The second series moved to a Monday slot, beginning on 1 October 2007. A third series was broadcast during the summer months of June and July 2008. The fourth series commenced airing on 10 November 2008.
Series presenters have included Aine Lawlor, Bryan Dobson, George Lee, Richard Crowley, Paul Cunningham, John Murray and Cathal Mac Coille. Guests to have featured in the series include Hans Blix, Michael Smurfit, Michael Colgan, Ben Dunne, clergymen Diarmuid Martin and Peter Sutherland, Ulick McEvaddy, T. K. Whitaker, Seymour Hersh, Alan Johnston, Ruth Bader Ginsburg, Seán FitzPatrick, Roy Foster, Samantha Power, Declan Ganley and Jeffrey Sachs. Each edition is typically approximately forty minutes length in total, with all the interviews available to watch online at RTÉ.ie.