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RJ-45 Crossover Cable and Straight Through Pinouts
Connectivity examples for hub-to-hub, hub-to-transceiver, transceiver-to-transceiver, pinouts and color coding for standarded ethernet cabling.
| Crossover Cable |
| RJ-45 PIN |
RJ-45 PIN |
| 1 Rx+ |
3 Tx+ |
| 2 Rc- |
6 Tx- |
| 3 Tx+ |
1 Rc+ |
| 6 Tx- |
2 Rc- |
|
 |
| Straight through Cable |
| RJ-45 PIN |
RJ-45 PIN |
| 1 Tx+ |
1 RC+ |
| 2 Tx- |
2 RC- |
| 3 Rc+ |
3 Tx+ |
| 6 Rc+ |
6 Tx- |
|
Please Note: The connector view shown is color-coded for a
straight thru cable assembly, when connecting Hub to Xcvr or DNI
Card.
Rule of Thumb: When connecting like devices you must use a
crossover cable. For example when connecting hub to hub, Xcvr to Xcvr, or DNI to
DNI, the wires must crossover at the opposite end of the cable assembly.
Interconnecting Your Hubs, Transceivers, and DNI Cards
As noted in the illustrations below, a crossover cable is required when
connecting a Hub to a Hub, or a Transceiver to Transceiver, or DNI to DNI card,
or Transceiver to DNI card. When connecting a Hub to a transceiver or DNI card,
a straight through cable is always used.
Please Note: Some products are
equipped with internal switches that can internallly cross the twisted
pairs.
In these illustrations a Hub can refer to any standalone product.
Hub to Hub Connectivity
Hub to Tranceiver or DNI Card Connectivity
Transceiver to DNI Connectivity
Category 5 Wiring Standards
EIA/TIA 568A/568B and AT&T 258A define the wiring standards
and allow for two different wiring color codes.
| Pin # |
EIA/TIA 568A |
AT&T 258A, or EIA/TIA 568B |
Ethernet 10BASE-T |
Token Ring |
FDDI, ATM, and TP-PMD |
| 1 |
White/Green |
White/Orange |
X |
|
X |
| 2 |
Green/White |
Orange/White |
X |
|
X |
| 3 |
White/Orange |
White/Green |
X |
X |
|
| 4 |
Blue/White |
Blue/White |
|
X |
|
| 5 |
White/Blue |
White/Blue |
|
X |
|
| 6 |
Orange/White |
Green/White |
X |
X |
|
| 7 |
White/Brown |
White/Brown |
|
|
X |
| 8 |
Brown/White |
Brown/White |
|
|
X |
- Pairs may be solid colors and not have the stripe.
- Category 5 cable must use Category 5 rated connectors.
Please see the origins of this page at Cabletron Systems.
Instructions for an Ethernet 10BaseT Crossover Cable
The pinouts for an Ethernet 10BaseT crossover cable are as follows:
Connector 1
Pinout |
Connector 2
Pinout |
![[Diagram of crossover pinout]](images/crossover.gif) |
| 1 |
3 |
| 2 |
6 |
| 3 |
1 |
| 4 |
OPEN |
| 5 |
OPEN |
| 6 |
2 |
| 7 |
OPEN |
| 8 |
OPEN |
pin 1 to pin 3, pin 2 to pin 6, pin 3 to pin 1, and
pin 6 to pin 2: All of the other pins are left open.
These instructions can also be used to purchase an Ethernet crossover cable
to network your computer and printer together. Don't just buy any RJ-45 cable;
the internal pinout for a crossover cable is different from the pinout of an
RJ-45 cable normally used in Ethernet. Make sure the packaging is clearly
labeled "crossover cable", or have someone create the cable for you.
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