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Crossover Cables

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Over the years we have accumulated a database of crossover cable pin out diagrams, as well as straight through cables, that reaches into Millions of configurations, for all interface types and communications standards.

You can order such cable assemblies from stock or we can manufacture them custom to your precise specifications.

The basic concept in crossover cables is that when connecting similar devices such as a DTE to a DTE or a DCE to a DCE the cable needed for the job is of crossover design. On the other hand, when connecting a DTE to a DCE, the cable required is a straight through cable.

 

Our most popular crossover cables are:

Crossover Cable

Sample application

Ethernet Crossover Cables

Ethernet card to Ethernet card type

RS-232 Serial Crossover Cables

PC to PC, PC to Printer type

V.35 Crossover Cable

router to router type

RS-449/RS-422, X.21 and RS-530 Crossover Cables

DSU/CSU to DSU/CSU type

T1/E1 Crossover Cable

Switch to Switch, DSU to DSU, etc

Ethernet Networking and Ethernet Cables

Ethernet is the most popular and considered the networking topology standard for most computer connections. There have been many kinds of Ethernet, but the most popular is 10/100Mbps running over copper twisted pair wires. 100Mbps Ethernet is also called 100baseT and Fast Ethernet.

Older Ethernet standards ran on COAX cable and were referred to as 10base2 Thin Ethernet and 10base5 Thick Ethernet. Some hubs still have a coax connector to bridge together twisted pair and Thin Ethernet networks.

A newer Ethernet standard called Gigabit Ethernet or 1000baseT also can run over copper wire but hubs ands switches are VERY expensive.

10/100 Ethernet

Connections:

Connections between 10/100 Ethernet adapters are made using cables that run to an Ethernet HUB or Switch. Hubs electrically connect your computers together and switches act like traffic cops making your network more efficient.

When only two computers are present. A special kind of Ethernet cable can be used called a CROSSOVER cable.

Ethernet Cables:

10/100 Ethernet cables have 8 wires, of witch 4 are used for data. The other wires are twisted around the data lines for electrical stability and resistance to electrical interference. The cables end in RJ-45 connectors that resemble large telephone line connectors.

Two kinds of wiring schemes are available for Ethernet cables. Patch cables and Crossover cables. The crossover cable is special because with a single cable, two computers can be directly connected together without a hub or switch. If a cable does not say crossover, it is a standard patch cable. If you are connecting computers to a hub or switch, you need patch cables

There are also different grades of cable quality. The most common are CAT5, CAT5e and CAT6. CAT5 is good for most purposes and can transfer data at 100Mbps. CAT5e is rated for 200Mbps and CAT6 is rated for gigabit Ethernet. I like to run CAT5e whenever possible because there is usually not a cost difference from CAT5 if you look hard enough.

Crossover Cables Explained

Ethernet has two pairs of wires in a twisted pair setup: one pair for transmit and one for receive.

When you connect a bunch of machines together using a hub, the hub relays all the information from all the Transmit pairs to all the Receive pairs. That is, each machine sees on its receive pairs the information sent on every machine's Transmit pairs. The hub logically connects all the Transmit pairs to all the Receive pairs.

Ethernet crossover cables are often used in home networks when connecting two ethernet computers without a hub. An Ethernet crossover cable has it's send and receive wires crossed. When using a hub or switch, this is automatically done for you.

Unfortunately some devices like cable and dsl modems have their actual ethernet plugs reversed. This is to allow people to hook up a cable modem to a computer without a special crossover cable. When adding a hub into the mix, the issue can get confusing.

Maximum distances:

For all twisted pair Ethernet, 100Meters is your maximum distance.

Ethernet to Fiber

Ethernet to Fiber media converters are starting to come down in price.. When 100Meters is not enough distance, an Ethernet to fiber media converter can be placed on each end making the maximum distance something like 40Km. Another use for fiber is electrical insulation. Some people like to run cables underground between homes. If you run CAT5 cable, the homes have different 'ground potentials' and you will burn out network card during any electrical storm. The solution is fiber! Run fiber between the homes or run a pair of fiber converters on one end of the cable with a short fiber run. This will electrically separate the two homes.

Ethernet 10BaseT or 100BaseT Crossover Cable Diagrams

Here is the pin out diagram for building an Ethernet 10BaseT or 100BaseT crossover cable.

Connector 1
Pinout

Connector 2
Pinout

1

3

2

6

3

1

4

OPEN

5

OPEN

6

2

7

OPEN

8

OPEN


How to wire EIA 568-B Crossover Cables:

CONNECTOR 1

CONNECTOR 2

1 wht/org
2 org/wht
3 wht/grn
4 blu/wht
5 wht/blu
6 grn/wht
7 wht/brn
8 brn/wht

1 wht/grn
2 grn/wht
3 wht/org
4 blu/wht
5 wht/blu
6 org/wht
7 brn/wht
8 wht/brn


USOC crossover cables:

1 wht/brn
2 wht/grn
3 wht/org
4 wht/blu
5 blu/wht
6 org/wht
7 grn/wht
8 brn/wht

8 wht/brn
7 wht/grn
6 wht/org
5 wht/blu
4 blu/wht
3 org/wht
2 grn/wht
1 brn/wht

For product availability and to purchase, contact our Technical and Sales Support Team

 

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