UTP Cable
An UTP cable (category 5) is one of the most popular LAN cables. This cable consists of 4 twisted pairs of metal wires (that means there are 8 wires in the cable). Adding RJ45 connectors at both ends of the UTP cable, it comes a LAN cable they usually use.In Minoh lab, we always make UTP based LAN cables with the following instruction written by me. I don't know the instruction is formal or not, but at least it works well in Minoh lab.
- 10 (100) Base T Straight
- 10 (100) Base T Cross
- ATM (155Mbps/25Mbps compatible) Straight
- ATM (155Mbps/25Mbps compatible) Cross
- CDDI Straight
- CDDI Cross
- ISDN S/T point connection
Preparation
You need a special plier, RJ45 connectors, UTP cables, and a cutter. |  |  |  |
| UTP Category 5 cable | RJ45 Connector | Special Plier | Cutter |
Making Cable
Follow the steps below.- Remove the outmost vinyl shield for 12mm at one end of the cable (we call this side A-side).
- Arrange the metal wires in parallel (refer the each section's wire arrangement table). Don't remove the shiled of each metal line.
- Insert the metal wires into RJ45 connector on keeping the metal wire arrangement.
- Set the RJ45 connector (with the cable) on the plier, and squeeze it tightly.
- Make the other side of the cable (we call this side B-side) in the same way.
- After you made it, you don't need to take care of the direction of the cable. (Any cable in this page is directionless --- that means you can set either end of the cable to either device.)
Take the UTP cable with your left hand and a RJ45 connector with your righyt hand. Hold the RJ45 connector in the way you can see the contact metal face (the horn(?) of the RJ45 connector comes invisible from you now). At this moment, I call Pin-number 1, 2, 3, ... from the upper side to the bottom side. This is the same at both side of the cable.
There are several different color set of UTP cables, so if the cable you have is not same as the one below, please re-map the color in a good way...
 |  |
| Same order in the wire arrangement table | Insertion |
The tables below are for the case where the UTP cable consists of green/green-white, orange/orange-white, blue/blue-white, brown/brown-white twisted pairs.
10 Base T / 100 Base T Straight
10BaseT and 100BaseT are most common mode of LAN. You can use UTP category-5 cable for both mode. (You can use UTP category-3 cable for 10BaseT, in which there are only 3 wires inside the cable.)A straight cable is used to connect a computer to a hub. You can use it to connect 2 hubs in the case one of the hub has an uplink port (and you use normal port on the other hub).
| Pin ID | side A | side B |
| 1 | orange-white | orange-white |
| 2 | orange | orange |
| 3 | green-white | green-white |
| 4 | blue | blue |
| 5 | blue-white | blue-white |
| 6 | green | green |
| 7 | brown-white | brown-white |
| 8 | brown | brown |
10 Base T / 100 Base T Cross
A cross cable for 10BaseT and 100BaseT is used to connect 2 computers directly (with ONLY the UTP cable). It is also used when you connect 2 hubs with a normal port on both hubs. (In other words, the cross cable is used relatively in a rare case.)| Pin ID | side A | side B |
| 1 | orange-white | green-white |
| 2 | orange | green |
| 3 | green-white | orange-white |
| 4 | blue | blue |
| 5 | blue-white | blue-white |
| 6 | green | orange |
| 7 | brown-white | brown-white |
| 8 | brown | brown |
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