pin 2 for line 2, with the outer pair, pins 1 and 6 carrying the second line. This arrangement was introduced for the same reason as the capacitor in BS 6313; to allow backwards compatibility with older GPO style type 3 wire phones that lacked an anti-tinkle circuit, which were common in the 1970s and into the 1980s. Modern Irish jacks also contain screw down lugs to connect extension phone wiring or a hardwired pre 1970s phone. The connection block has an “R” terminal for connecting the ringing wire to the capacitor. Despite the circuitry being available in the jack, UK phones should still be connected with an adapter with its own ringing capacitor, as the “R” wire typically is no longer connected in most homes, unless the wiring was originally used with rotary dial telephones. Making the connections As previously mentioned the actual connections are made using Insulation-displacement connectors (IDC). A punch down tool is required to do this and two sorts are available. One is of plastic construction and only intended for occasional use. The other is a professional tool used by installers, which is a spring loaded push down tool that both inserts the wire and trims it in one action : an example is shown in the photograph. It also comes with a tool for removing wires from sockets. From Q3 2016, Openreach started using a new, "toolless" version of the demarcation socket—the NTE5C—which does not require an IDC tool to make the connections. Cabling arrangements Shown below are the cabling arrangements for both 4-wire and 6-wire cable. Initially 4-wire was used and many older installations still use it, then the 6-wire became the new standard, but the 4-wire has latterly been reissued to all Openreach technicians as part of cost savings. Modern 4-wire however is the same diameter as 6-wire to allow technicians to retain existing tacking guns and cable clips. Note that the wires in the 6-wire cable are coloured with two colours in a ratio of four to one in length, with the first colour mentioned being the predominant one, e.g. if the indicated colour of the wire is W-B then the wire will be coloured white for 12 mm, then blue for 3 mm and so on. (In other words, it looks like a white wire with blue patches on it.) Strictly speaking, a textbook installation will only actually use pins 2,