Sockets Connected in Cascade
When there is only one socket in a house or apartment, the incoming line is connected to the two lower receptacles and the upper receptacles are left unused. When a subscriber has more than one telephone socket, they typically are connected so that two telephones can not be connected to the telephone exchange at the same time. This is done by connecting the two upper receptacles of a socket to the lower receptacles of the next socket. When a connected telephone's handset is lifted the two twisted pair connections are separated, thus disconnecting any telephones downward in the chain.
The plastic pin adds a presence function. When not inserted into a jack, the jack itself (mechanically) connects the incoming line to the next socket.
The cascade topology makes installing a DSL splitter a matter of plugging it in the first socket since this socket provides both direct access to the PSTN and connections to the remaining sockets.
Read more about this topic: Swedish Telephone Plugs & Sockets
Famous quotes containing the words sockets, connected and/or cascade:
“And in their blazing solitude
The stars sang in their sockets through the night:
“Blow bright, blow bright
The coal of this unquickened world.””
—Philip Larkin (1922–1986)
“Religious fervor makes the devil a very real personage, and anything awe-inspiring or not easily understood is usually connected with him. Perhaps this explains why, not only in the Ozarks but all over the State, his name crops up so frequently.”
—Administration in the State of Miss, U.S. public relief program (1935-1943)
““End of tomorrow.
Don’t try to start the car or look deeper
Into the eternal wimpling of the sky: luster
On luster, transparency floated onto the topmost layer
Until the whole thing overflows like a silver
Wedding cake or Christmas tree, in a cascade of tears.””
—John Ashbery (b. 1927)