Ethernet 10/100/1000Base-T Straight Thru
Wiring scheme: EIA/TIA 568B
This cable will work with 10Base-T, 100Base-TX and 1000Base-T and is
used to connect a network interface card to a hub or network
outlet. These cables are sometimes called "whips".
Note: While 10BaseT and 100Base-TX only uses two pairs, please do connect
all pairs since 1000BaseT uses all of them, and save yourself some future
debugging :)
Pinout
RJ45 MALE CONNECTOR to network interface card.
RJ45 MALE CONNECTOR to hub.
Name |
Pin |
|
|
Cable Color |
Pin |
Name
|
TX+ |
1 |
|
|
White/Orange |
1 |
TX+
|
TX- |
2 |
|
|
Orange |
2 |
TX-
|
RX+ |
3 |
|
|
White/Green |
3 |
RX+
|
|
4 |
|
|
Blue |
4 |
|
|
5 |
|
|
White/Blue |
5 |
|
RX- |
6 |
|
|
Green |
6 |
RX-
|
|
7 |
|
|
White/Brown |
7 |
|
|
8 |
|
|
Brown |
8 |
|
Note: It's important that each pair is kept as a pair. TX+
& TX- must be in the pair, and RX+ & RX- must
together in another pair. (Just as the table above shows).
Just for your information, this is how the pairs are named:
Pair |
Pins |
Common color
|
1 |
4 & 5 |
Blue
|
2 |
1 & 2 |
Orange
|
3 |
3 & 6 |
Green
|
4 |
7 & 8 |
Brown
|
The + side of each pair is called the "tip" and the
- side is called the "ring", a reference to old
telephone connectors.
|
Pin No. |
Signal Description |
Abbr. |
DTE |
DCE |
1 |
DCE Ready, Ring Indicator |
DSR/RI |
«— |
—» |
2 |
Received Line Signal Detector |
DCD |
«— |
—» |
3 |
DTE Ready |
DTR |
—» |
«— |
4 |
Signal Ground |
SG |
|
|
5 |
Received Data |
RxD |
«— |
—» |
6 |
Transmitted Data |
TxD |
—» |
«— |
7 |
Clear To Send |
CTS |
«— |
—» |
8 |
Request To Send |
RTS |
—» |
«—
|
This is made possible because of the wasteful (some may say "spare") wires in cat-5 cable.
Cat 5 cable and RJ-45 jacks have eight wires.
Ethernet uses two pairs (four wires), one for send and one for receive.