RJ-11 (Telephone) Plug | RJ-45 (Data) Plug | 110 Block / 66 Block Punchdown
- RJ-11 (Telephone) Plug
Figure 1
Figure 1 is the wiring scheme for the plug side of an RJ-11 connector. The diagram is shown with the "hook clip" on the underside. The typical RJ-11 connector has six terminals. Usually, only the middle four pins are used. The POTS (Plain Old Telephone Service) residential telephone wiring generally contains two pairs of wires - designed for two separate telephone lines. The center pins (Red and Green) contain the first telephone line. Please note that business (digital) phone systems may be wired differently. -
Figure 2
Figure 2 is the wiring scheme for the plug side of an RJ-45 connector in accordance with T-568B standards. The T-568B standard is the most commonly used. The wiring diagram is shown with the "hook clip" on the underside. The wall jack may be wired in a different sequence because the wires may be crossed inside the jack. The jack should have a wiring diagram or designated pin numbers/colors to match up to the color code below. When wiring a jack or an RJ-45 plug, remember to keep the “twist” as close as possible to the (jack or plug) receptacle. This will insure compliance with Ethernet wiring standards.
Specification T-568BPin # Color Pair # Name 1 white/ orange 2 Transmit Data + 2 orange 2 Transmit Data - 3 white/ green 3 Receive Data + 4 blue 1 not used 5 white/ blue 1 not used 6 green 3 Receive Data - 7 white/ brown 4 not used 8 brown 4 not used
(Even pin numbers are always solid color. Odd pin numbers are white/ stripe color.)
For reference purposes only, Figure 3 details the wiring scheme according to T-568A standards. Be sure adhere to EITHER the T-568B or the T-568A standard. Do not mix different wiring specifications within the same wiring installation.
Figure 3
Specification T-568A
Pin # Color Pair # Name 1 white/ green 3 Receive Data + 2 green 3 Receive Data - 3 white/ orange 2 Transmit Data + 4 blue 1 not used 5 white/ blue 1 not used 6 orange 2 Transmit Data - 7 white/ brown 4 not used 8 brown 4 not used Crossover Cable
Some applications may require a crossover cable. The most common use of a crossover cable occurs in wiring together two Hubs. A crossover cable “crosses over” Transmit and Receive Data. Pins 1 and 3 are crossed over, and Pins 2 and 6 are crossed over. To build a CROSSOVER cable, simply wire one side according to specification T-568B, and wire the other side according to T-568A. - 110 Block / 66 Block Punchdown
Punchdowns are made with the pairs in order with the white-stripe wire first, then the colored wire.
Pair 1 white/blue - Blue
Pair 2 white/orange - Orange
Pair 3 white/green - Green
Pair 4 white/brown - Brown
Reminder hint: BLOG– BLue Orange Green and Brown
Punchdown Block Order