Wire a RJ45 jack
Ethernet
Eight Position (RJ-45) Modular Cable
T568B (with clip down)
| Pin |
Color |
| 1 |
orange/white |
| 2 |
orange |
| 3 |
green/white |
| 4 |
blue |
| 5 |
blue/white |
| 6 |
green |
| 7 |
brown/white |
| 8 |
brown |
T568A (with clip down)
| Pin |
Color |
| 1 |
green/white |
| 2 |
green |
| 3 |
orange/white |
| 4 |
blue |
| 5 |
blue/white |
| 6 |
orange |
| 7 |
brown/white |
| 8 |
brown |
4 Pair Crossover, used with T568B (with clip down)
| Pin |
Color |
| 1 |
green/white |
| 2 |
green |
| 3 |
orange/white |
| 4 |
brown/white |
| 5 |
brown |
| 6 |
orange |
| 7 |
blue |
| 8 |
blue/white |
UTP consists of 4 twisted pairs. The standard colors are:
white/blue - blue
white/orange - orange
white/green - green
white/brown - brown
2 Pair crossover 10baseT, 100baseT:
one end T568A, other end T568B.
4 Pair crossover 10baseT, 100baseT, 1000baseT:
one end T568B, other end crossover.
Color codes Demarc to CSU/DSU plugs
128K or higher Frame Relay/T1 Plug
The cable from the telco demarc (punch-down block) to the CSU/DSU is just
a plain straight-through 8-conductor modular cable with a RJ-48 or RJ-45
plug at the end. For short runs, flat ribbon cable is fine, and one
about 6 feet is normally supplied with the CSU. Make sure that the
pins are not reversed, looking through the clear plugs you should see the
colored wires in the same left-to-right order on both ends. A twisted-pair
ethernet cord will also work, and is better for anything over a few feet.
It isn't necessary that it be shielded.
Pin Number Designations
| Pin |
Color |
Description |
| 1 |
blue |
RecvData + |
| 2 |
blue/white |
RecvData - |
| 3 |
Unused |
Unused |
| 4 |
orange |
TxData + |
| 5 |
orange/white |
TxData - |
| 6 |
Unused |
Unused |
| 7 |
Unused |
Unused |
| 8 |
Unused |
Unused |
T1 Loopback plug
56K Frame Relay plug
The plug for 56K frame relays differs slightly from the T1 or 128K+.
The pairs are on different pins (7 and 8 as opposed to 4 and 5) and the
transmit and recieve pairs are swapped.
Pin Number Designations
| Pin |
Color |
Description |
| 1 |
blue |
TxData + |
| 2 |
blue/white |
TxData - |
| 3 |
Unused |
Unused |
| 4 |
Unused |
Unused |
| 5 |
Unused |
Unused |
| 6 |
Unused |
Unused |
| 7 |
orange |
RecvData + |
| 8 |
orange/white |
RecvData - |
| Rollover | 2 pair Crossover | 4 pair Crossover |
|---|
| 1-8 | 1-3 | 1-3 |
| 2-7 | 2-6 | 2-6 |
| 3-6 | 3-1 | 3-1 |
| 4-5 | 4-4 | 4-7 |
| 5-4 | 5-5 | 5-8 |
| 6-3 | 6-2 | 6-2 |
| 7-2 | 7-7 | 7-4 |
| 8-1 | 8-8 | 8-5 |
|