| The RJ-11 is currently the most widely used | | | | are other registered jacks such as RJ-61, the |
| phone jack. These connectors are utilized to | | | | 4-line jack; RJ-25, a 3-line jack and RJ-14, a 2-line |
| terminate phone lines and are generally installed | | | | jack. All of these jacks use the 6-position modular |
| with single line Plain Old Telephone Service (POTS) | | | | connectors. |
| jacks. Among all the registered jacks, they are | | | | The pin number 5, being either the yellow or |
| the most common ones where virtually all of the | | | | orange color code or the pin number 2, being |
| telephone jacks in offices and houses in North | | | | either the black or white with orange stripe color |
| America as well as other countries use this form | | | | code in RJ-11 can carry low voltage DC or AC |
| of connector. Another feature of such connectors | | | | power during the powered up state. The |
| is they are often encased in plastic and designed | | | | telephone line will supply the power for all the |
| modularly. The modular pattern implies that the | | | | phone terminals. Some of the terminals comprise |
| components such as connector and telephone | | | | of incandescent lights hence they require more |
| jack can be plugged with one another instead of | | | | energy compared to normal telephone line |
| being hard-wired. | | | | supplies, considering their typical transformer |
| The RJ-11 connector applies the use of six | | | | output is five volts and the dial lights will consume |
| position and four contacts, 6P4C wiring standard. | | | | 6.3 volts. |
| It indicates that the connector consists of six | | | | Depending on the color code convention of your |
| positions where only four of them have contacts. | | | | RJ-11 connector, reading from left to right while |
| Contacts meaning they have two wires | | | | holding it with contacts pointing upward and jack |
| connected to them. This way of standard wiring | | | | facing you, there are two terminals, namely |
| for modular connectors are applied to make sure | | | | negative and positive. Pin number 3 will be the |
| the plug can fit completely. The additional wires | | | | negative terminal having either the red or blue |
| can be used for other applications, namely | | | | color code while pin number 4 will be the positive |
| powering an LED ring-indicator or preventing the | | | | terminal, being either the green or white with blue |
| pulse-dial telephone from ringing the addition phone | | | | stripe color code. |
| bells, as a platform for selective ringers. There | | | | |