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Modular connector 6P6C plug (left) and 6P4C jack (right) A telephone jack and a telephone plug are electrical connectors for connecting a telephone set or other telecommunications apparatus to the telephone wiring inside a building, establishing a connection to a telephone network.
In the UK, however, many telephone circuits still have an anti-tinkle connection between the master socket and extensions on a third wire. But such a 3-wire interface is not the symmetric interface needed for balanced twisted-pair transmission lines , and therefore prone to electromagnetic interference and crosstalk with nearby other wiring.
Utility pole with electric lines (top) and telephone cables. Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]
It is used to implement connections for up to 25 lines, or circuits that require many wire pairs, such as used in the 1A2 key telephone system. The miniature ribbon connector of this interface is also known as a 50-pin telco connector, CHAMP(AMP), or Amphenol connector, the last being a genericized trademark , as Amphenol was a prominent ...
Some telephone technicians used mnemonic phrases, such as red-right-ring-rear, or ring-right-red-rough, to remember that the red wire connects to the right-side post in the wall jack and to the ring on the plug and to the rear lug on main distribution frames. Sometimes rough or ridge was added for jumper wires with a tactile code. [citation needed]
66 blocks are designed to terminate 20 through 26 AWG insulated solid copper wire or 18 & 19 gauge skinned solid copper wire. The 66 series connecting block, introduced in the Bell System in 1962, was the first terminating device with insulation displacement connector technology. The term 66 block reflects its Western Electric model number.
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