| Pair | Primary (tip) | Secondary (ring) |
| 1 | White/Blue | Blue/White |
| 2 | White/Orange | Orange/White |
| 3 | White/Green | Green/White |
| 4 | White/Brown | Brown/White |
| 5 | White/Slate | Slate/White |
| 6 | Red/Blue | Blue/Red |
| 7 | Red/Orange | Orange/Red |
| 8 | Red/Green | Green/Red |
| 9 | Red/Brown | Brown/Red |
| 10 | Red/Slate | Slate/Red |
| 11 | Black/Blue | Blue/Black |
| 12 | Black/Orange | Orange/Black |
| 13 | Black/Green | Green/Black |
| 14 | Black/Brown | Brown/Black |
| 15 | Black/Slate | Slate/Black |
| 16 | Yellow/Blue | Blue/Yellow |
| 17 | Yellow/Orange | Orange/Yellow |
| 18 | Yellow/Green | Green/Yellow |
| 19 | Yellow/Brown | Brown/Yellow |
| 20 | Yellow/Slate | Slate/Yellow |
| 21 | Violet/Blue | Blue/Violet |
| 22 | Violet/Orange | Orange/Violet |
| 23 | Violet/Green | Green/Violet |
| 24 | Violet/Brown | Brown/Violet |
| 25 | Violet/Slate | Slate/Violet |
The 568B wiring is used in almost 90% of installations. The pin numbers refer to a RJ-45 telephone type connector. Pin #1 is the one on the left when you hold the tab down with the wire facing you, as you would plug it in. Pin #2 is the next one on the right and lastly, pin #8 is the one all the way to the right.
PIN # COLOR SCREW TYPE COLOR
NOTE: This is an
RJ-45 wall plate (front view), T568B.
The 568A wiring is used when compatibility to telephone wiring systems (USOC) is needed. It is not recommended, as parts are not as commonly available.
PIN # COLOR SCREW TYPE PLATE
NOTE: This is an
RJ-45 wall plate (front view), T568A.
The USOC wiring is used when is most home and office telephone systems. It used either an RJ-11 plug (4 wire) or an RJ-14 plug (6 wire).
For telephone systems the RJ-11 (or RJ-14) wiring is reversed. For most computer systems it is straight through.
PIN # COLOR SCREW TYPE PLATE USED
Is growing very fast and replacing 56k modems as the price comes down. As of this month, you can get it for $39.95 per month with a free modem. It is many times faster than a 56k modem for downloads.
Wiring up a DSL line is easy. It uses the same wires that you telephone line uses.
For a RJ-11 connector:
Pin # COLOR CODE OLD STYLE COLOR
3 Blue/White Red
4 White/Blue Green
For an RJ-45 connector:
Pin # COLOR CODE OLD STYLE COLOR
4 Blue/White Red
5 White/Blue Green
A DSL modem is installed to your telephone line, then a CATEGORY 5 RJ-45 basic patch cord is connected from the modem to a Network Interface Card (NIC) in your computer. If more than one computer will be using the line, a hub or a bridge/router can be used to connect multiple PC's.
Two independent telephone lines are supplied on a single twisted pair cable, each capable of carrying up to 64kbs. They are bondable together to create a 128kbs line. A special ISDN modem is required.
The color code of the wires are the same as for a DSL line (see DSL).
T1 is a high speed digital network (mainly used for businesses) which has speeds of 1.544Mbps. Twenty four voice circuits (or channels) are available on each T1 circuit.
The T1 circuit is installed by the telephone company at the customer's DEMARK or MPOE (Minimum Point of Entry). From there it is usually the customer's responsibility to connect to the equipment. If you are extending the DEMARK more than 15 feet, you should follow the following:
Make sure you use D-shield cable, which is CATEGORY 5 shielded. Each pair MUST be shielded, not an overall foil wrap. It you use overall foil wrap cable, you must run 2 lines, one for transmit and one from receive to the extended DEMARK. This minimizes cross talk between pairs.
You must use a CATEGORY 5 patch cord 15 feet or less from your equipment to the RJ-45 (RJ48C-RJ48X) connector.
The following is a wiring diagram for the 8 position jack. Make sure you use a CATEGORY 5 rated RJ-45 jack.
| DESCRIPTION | PIN # | COLOR |
| Receive from Network (ring) | 1 | Blue/White |
| Receive from Network (tip) | 2 | White/Blue |
| Transmit from Network (ring) | 4 | Orange/White |
| Transmit from Network (tip) | 5 | White/Orange |