Network Wiring Instructions

RJ-11 (Telephone) Plug | RJ-45 (Data) Plug | 110 Block / 66 Block Punchdown

1. 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.
2. RJ-45 (DATA) Plug Wiring
   
   

   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-568B

   Pin #	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.

3. 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