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You are referrring to the line cord I presume: The cord that connects the telephone set to the jack. A two-wire cord will work for a single-line telephone set. A four-wire cord will support a two-line telephone. If you use a two-wire cord on a two-line telephone set, line two will be dead on the set. A four-wire cord will , of course, work just fine for a single-line set. When you look at the plugs on the ends of the four-wire cord, you will see four small contacts: The middle two are for "line one" and the outer two are for "line two". Sometimes there may me a six-position/contact plug on the ends, with the two outer-most positions not having any wiring connected to them. Line cords also come in 6- and 8- wire configurations for other various types of multi-line analog and digital telephone sets.
Wiki User
∙ 16y ago
Wiki User
∙ 15y agoMost phones use only two wires,Red and Green. Your end on the phone line might have four pins, but are only using two. The older phones had red,green,black and yellow. the black and yellow are not necessary in most cases in residential apps. Some phones also are using four wires for a 2 line system.
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