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:
“Webster was much possessed by death
And saw the skull beneath the skin;
And breastless creatures under ground
Leaned backward with a lipless grin.
Daffodil bulbs instead of balls
Stared from the sockets of the eyes!”
—T.S. (Thomas Stearns)
“War and culture, those are the two poles of Europe, her heaven and hell, her glory and shame, and they cannot be separated from one another. When one comes to an end, the other will end also and one cannot end without the other. The fact that no war has broken out in Europe for fifty years is connected in some mysterious way with the fact that for fifty years no new Picasso has appeared either.”
—Milan Kundera (b. 1929)
““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)