Contents of this page are obsolete.
This page is preserved and stored at this URL just from historical viewpoint.
Original URL was http://www.mm.media.kyoto-u.ac.jp/members/kameda/...
Please visit
www.kameda-lab.org
for recent information. (2002/12/06, kameda@ieee.org)
UTP Cable
[Japanese]
/
Documents,
Kameda,
Minoh Lab
2000/07/04
I noticed that this page is sometimes refered from foreign countries
(why?), so now I prepare this English page... (2000/06/27)
I tried to write correct instruction, but please hold yourself
responsible for using information of this page.
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
You need a special plier, RJ45 connectors, UTP cables, and a cutter.
| 
| 
| 
|
| UTP Category 5 cable
| RJ45 Connector
| Special Plier
| Cutter
|
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.)
How to see the wire arrangement
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.
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
|
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
|
ATM straight cable is used to connect ATM NIC-card (computer) to
ATM-Switch.
You can use the straight cable for 10BaseT and
100BaseT as ATM straight cable because the pin arrangement is the
same. (Actually, an ATM straight cable uses only 1,2,7,8 pins in
155Mbps mode, and 3,4,5,6 pins in 25Mbps mode. However,
the straight cable of 10BaseT and 100BaseT is fully
wired and so there is no problem.)
You use ATM cross cable to connect 2 ATM-Switches (Wow, you have
two!) with normal ports. (If there is an up-link port on one ATM
switch, I guess you can use ATM straight cable to connect 2
ATM-Switches. However, I have never seen an ATM-Switch which has an
up-link port.)
An ATM cross cable uses only 1,2,7,8 pins in
155Mbps mode, and 3,4,5,6 pins in 25Mbps mode.
Concerning CDDI cross cable, the pin arrangement of 1,2,7,8 pins are
same as that of ATM cross cable, so you can divert
CDDI cross cable
for 155Mbps ATM cross cable (though I don't think you have it...)
| Pin ID
| side A
| side B
|
| 1
| orange-white
| brown-white
|
| 2
| orange
| brown
|
| 3
| green-white
| blue
|
| 4
| blue
| green-white
|
| 5
| blue-white
| green
|
| 6
| green
| blue-white
|
| 7
| brown-white
| orange-white
|
| 8
| brown
| orange
|
CDDI straight cable is used to connect CDDI NIC-card (computer) to
CDDI concentrator. This cable is exactly same as the 10/100BaseT straight cable .
CDDIのクロスケーブルは、以下のピンアサインになります。
| Pin ID
| side A
| side B
|
| 1
| orange
| brown
|
| 2
| orange-white
| brown-white
|
| 3
| green
| green
|
| 4
| blue
| blue
|
| 5
| blue-white
| blue-white
|
| 6
| green-white
| green-white
|
| 7
| brown
| orange
|
| 8
| brown-white
| orange-white
|
ISDN S/T point connection cable is used to connect ISDN device (TA,
digital telephone, etc) to an DSU. Actually, this is same as
10BaseT/100BaseT straight cable.
kameda@media.kyoto-u.ac.jp
