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The phone wiring of the telephone socket is usually 1 pair, 2 pairs or 3 pairs (2, 4 or 6 cores). Today, most cables are UTP (unshielded twisted pair). In some cases, you may need to connect to or transpose from an old "quad" cable. The figure below provides the conversion between these standards.
Pair 1 (T1 & R1)
Usually, the main dial tone or call circuit is connected to the middle two pins (pins 3 and 4), and is a white/blue and blue/white pair (also called T1 and R1-tip 1 and ring 1) . A standard single-line telephone draws dial tone from these center pins.
Note: The wiring type shown here is called USOC (pronounced U-shaped socks). See the background below.
Pair 2 (T2 & R2)
The two pins of the secondary circuit (pins 2 and 5) are directly connected to the side of the center pin, and are white/orange and orange/white pairs (also called T2 and R2-tip 2 and ring 2). Depending on the application, the secondary circuit can be the second dial tone circuit on a two-line telephone, or the data/control circuit of an electronic key telephone.
Pair 3 (T3 & R3)
The third circuit is connected to the two external pins (pins 1 and 6) and is a white/green and green/white pair (also known as T3 and R3-tip 3 and ring 3). Depending on the application, the third circuit can be a third dial tone line on a three-line telephone, or an auxiliary circuit of an electronic key telephone.
For more information about electronic connectors, you can contact a professional phone jack connector manufacturer like us.
Tip & Ring
In telephones, the terms representing the conductors that make up a circuit are called "tips and loops." These terms originate from the early days of the telephone, when carriers used 1/4-inch phono plugs for telephone connections, similar to today's stereo headsets. The old system also had a third ground wire. "Tip" is the tip of the "Ring" is the tip of the plug, located on the positive (+) side of the circuit. "Ring" is a conductive ring located behind the tip of the plug, on the negative (-) side of the circuit. Located behind the ring is "Sleeve" "This is the ground connection.
The ground (casing) is no longer used for a single pair today.
USOC (Universal Service Ordering Codes)
In the old days of telephony, USOC (pronounced U-sock) standards were used to simplify and standardize the various different wiring schemes for modular jacks.
RJ (RJ-11, RJ-45, etc.)
The USOC standard consists of many different registered jack configurations, abbreviated as "RJ", and has names such as RJ-11, RJ-12. Today, we still refer to modular jacks in the RJ name, but rarely use them to refer to A. The wiring standard they originally intended to use. Although technically incorrect, the popular terms RJ-11, 12, or 14 refer to a 6-pin jack and RJ-45 to an 8-pin jack.
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