connecting two computers together

7/29/2019 Connecting Two Computers Together

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Cat 5 crossover

Cat 5 Crossover

category 5 crossover cable

Overview

An Cat 5 crossover cable is a type of Ethernet cable used to connect computing devices

together directly where they would normally be connected via a network switch, hub or

router, such as directly connecting two personal computers via their network adapters. Inother words, wherever two-way communication is necessary. Typical uses are router-to-

router, switch-to-switch, hub-to-hub, computer-to- computer, and router-to-computer

connections. Note that home routers already have a built-in adapter, straight-through cable

can be used directly in those circumstances.

In contrast to a straight-through cable, which has the same wiring scheme at both ends, a

crossover cable has one set of pin assignments at one end, and a second set of pin assignments

at the other end. This is how crossover cables are able to allow two-way communication.

IMPORTANT: Control surfaces, such as Digidesigns Control|24 and D-Command, fall

under the category of "computing device" for the purpose of this discussion. Think of thecontrol surface and the host computer as like devices. Two like devices, when connected

directly, require a crossover cable. Because a control surface connects to a host computer via

its Ethernet port, a crossover cable must be used. The control surface will not operate

properly if a straight-through cable is used because the straight-through cable will not enable

two-way communication between the two devices.

Description

Cable

Like a straight-through cable, Cat 5 crossover cable includes four twisted pairs of wire in a

single cable jacket. This is known as unshielded twisted pair (UTP) cable. Each pair is
https://www.brucetambling.com/wiki/File:Cat_5_Crossover_med.jpg


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represented by a specific color. Pair 1 is Blue, Pair 2 is Orange, Pair 3 is Green, and Pair 4 is

Brown. In each pair, one wire is a solid color, and the other is predominantly white with a

color stripe.

Cat 5 crossover cable is used for hub to hub, computer to computer connectivity wherever

two-way communication is necessary. All gigabit ethernet equipment, and most new10/100Mb equipment, supports automatic crossover, meaning that either a straight-through or

crossover cable may be used for any connection. However, older equipment requires the use

of a straight-through cable to connect a switch to a client device, and a crossover cable to

connect a switch to a switch or a client to a client. Crossover cables can be constructed by

wiring one end to the T568A scheme and the other end with the T568B scheme. This will

ensure that the Transmit (TX) pins on both ends are wired through to the Receive (RX) pins

on the other end.


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The 10BASE-T and 100BASE-TX Ethernet standards use one wire pair for transmission in

each direction. The Tx+ line from each device connects to the tip conductor, and the Tx- line

is connected to the ring. This requires that the transmit pair of each device be connected to the

receive pair of the device on the other end. In a network port, pins 1 and 2 are for transmit,

while pins 3 and 6 are for receive. So data received on the receive pins (3 and 6) at one end of

a crossover cable transmit the data out pins 1 and 2 on the other end. This applies for data

travelling through the crossover cable in either direction.
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When a terminal device is connected to a switch or hub, this crossover is done internally in

the switch or hub. A standard straight-through cable is used for this purpose where each pin of

the connector on one end is connected to the corresponding pin on the other connector.

One terminal device (e.g., a computer) may be connected directly to another without the use

of a switch or hub, but in that case the crossover must be done externally in the cable. Since10BASE-T and 100BASE-TX carry data on wire pairs 2 and 3, these two pairs must be

swapped in the cable. This is a crossover cable. A crossover cable must also be used to

connect two internally crossed devices (e.g., two hubs) as the internal crossovers cancel each

other out. This can also be accomplished by using a straight-through cable in series with a

modular crossover adapter.

Cat 5/5e/6 Modular Crossover Adapter

Note that a crossover adapter should be used only at one end of a straight-through cable.

Using crossover adapters at both ends of a straight-through cable would result in the

crossovers cancelling each other out.

Connectors

Because the only difference between the TIA/EIA-568-A and T568B pin/pair assignments are

that pairs 2 and 3 are swapped, a crossover cable may be envisioned as a cable with one

connector following T568A and the other T568B. Such a cable will work for 10BASE-T or

100BASE-TX.

10BaseT/100BaseTX Crossover

two pairs crossed, two pairs uncrossed

PinConnection

1

Connection

2

Pins

Positions

Pair Wire Pair Wire
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1 3whit

e/green2

whit

e/orange

2 3gree

n2

oran

ge

3 2whit

e/orange3

whit

e/green

4 1 blue 1 blue

5 1whit

e/blue1

whit

e/blue

6 2oran

ge3

gree

n

7 4whit

e/brown4

whit

e/brown

8 4bro

wn4

bro

wn

Certain equipment or installations, including those in which phone and/or power are mixed

with data in the same cable, may require that the "non-data" pairs 1 and 4 (pins 4, 5, 7 and 8)

remain un-crossed.

1000BASE-T4 (Gigabit crossover), which uses all four pairs, requires the other two pairs (1

and 4) to be swapped and also requires the solid/striped within each of those two pairs to be

swapped.

10Base-T/100Base-TX/1000Base-TX/T4 (Gigabit) Crossover

all four pairs crossed

PinConnection

1

Connection

2

Pins

Positions

Pair Wire Pair Wire
https://www.brucetambling.com/wiki/File:8P8C_Wire_42_brown.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_42_brown.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_41_white_brown_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_41_white_brown_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_32_green.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_22_orange.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_11_white_blue_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_11_white_blue_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_12_blue.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_12_blue.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_31_white_green_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_21_white_orange_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_22_orange.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_32_green.jpghttps://www.brucetambling.com/wiki/File:8P8C_Pins.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_21_white_orange_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_31_white_green_stripe.jpg


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1 2whit

e/orange3

whit

e/green

2 2oran

ge3

gree

n

3 3whit

e/green2

whit

e/orange

4 1 blue 4whit

e/brown

5 1whit

e/blue4

bro

wn

6 3gree

n2

oran

ge

7 4whit

e/brown1

blue

8 4bro

wn1

whit

e/blue

In practice, it does not matter if your Ethernet cables are wired as T568A or T568B, just so

long as both ends follow the same wiring format. It is just as valid to make a four-pair

crossover using T568A, or a two pair crossover using T568B, as it is to wire them the way

shown here. Typical commercially available "pre-wired" cables can follow either format

depending on who made them. What this means is that you may discover that one

manufacturer's cables are wired one way and another's the other way, yet both are "correct"

and will work. In either case, T568A or T568B, a normal (un-crossed) cable will have bothends wired according to the layout in the Connection 1 column.

Applications

Control surface-to-host computer connectivity

Router-to-router connectivity

Switch-to-switch connectivity

Hub-to-hub connectivity

Computer-to-computer connectivity

Router-to-computer connectivity

ETHERNET CABLE: COLOR-CODE STANDARDS
https://www.brucetambling.com/wiki/File:8P8C_Wire_11_white_blue_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_42_brown.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_12_blue.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_41_white_brown_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_22_orange.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_32_green.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_42_brown.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_11_white_blue_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_41_white_brown_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_12_blue.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_21_white_orange_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_31_white_green_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_32_green.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_22_orange.jpghttps://www.brucetambling.com/wiki/File:8P8C_Pins.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_31_white_green_stripe.jpghttps://www.brucetambling.com/wiki/File:8P8C_Wire_21_white_orange_stripe.jpg


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The information listed here is to assist Network Administrators in the color coding of Ethernet

cables. Please be aware that modifying Ethernet cables improperly may cause loss of network

connectivity. Use this information at your own risk, and insure all connectors and cables are

modified in accordance with standards. The Internet Centre and its affiliates cannot be held

liable for the use of this information in whole or in part.

T-568A Straight-Through Ethernet Cable

The T-568A standard is supposed to be used in new network installations. Most off-the-shelf

Ethernet cables are still of the T-568B standard; however, it makes absolutely no functional

difference in which you choose.

T-568B Straight-Through Ethernet Cable

Both the T-568A and the T-568B standard Straight-Through cables are used most often as

patch cords for your Ethernet connections. If you require a cable to connect two Ethernet

devices directly together without a hub or when you connect two hubs together, you will need

to use a Crossover cable instead.

RJ-45 Crossover Ethernet Cable


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A good way of remembering how to wire a Crossover Ethernet cable is to wire one end using

the T-568A standard and the other end using the T-568B standard. Another way ofremembering the color coding is to simply switch the Green set of wires in place with the

Orange set of wires. Specifically, switch the solid Green (G) with the solid Orange, and

switch the green/white with the orange/white.

Ethernet Cable Instructions:

1. Pull the cable off the reel to the desired length and cut. If you are pulling cables through holes,its easier to attach the RJ-45 plugs after the cable is pulled. The total length of wire segmentsbetween a PC and a hub or between two PC's cannot exceed 100 Meters (328 feet) for100BASE-TX and 300 Meters for 10BASE-T.

2. Start on one end and strip the cable jacket off (about 1") using a stripper or a knife. Be extra

careful not to nick the wires, otherwise you will need to start over.3. Spread, untwist the pairs, and arrange the wires in the order of the desired cable end. Flatten

the end between your thumb and forefinger. Trim the ends of the wires so they are even withone another, leaving only 1/2" in wire length. If it is longer than 1/2" it will be out-of-spec andsusceptible to crosstalk. Flatten and insure there are no spaces between wires.

4. Hold the RJ-45 plug with the clip facing down or away from you. Push the wires firmly into theplug. Inspect each wire is flat even at the front of the plug. Check the order of the wires.Double check again. Check that the jacket is fitted right against the stop of the plug. Carefullyhold the wire and firmly crimp the RJ-45 with the crimper.

5. Check the color orientation, check that the crimped connection is not about to come apart, andcheck to see if the wires are flat against the front of the plug. If even one of these areincorrect, you will have to start over. Test the Ethernet cable.

Ethernet Cable Tips:

A straight-thru cable has identical ends.

A crossover cable has different ends.

A straight-thru is used as a patch cord in Ethernet connections.

A crossover is used to connect two Ethernet devices without a hub or for connecting twohubs.

A crossover has one end with the Orange set of wires switched with the Green set.

Odd numbered pins are always striped, even numbered pins are always solid colored.

Looking at the RJ-45 with the clip facing away from you, Brown is always on the right, and pin1 is on the left.

No more than 1/2" of the Ethernet cable should be untwisted otherwise it will be susceptible tocrosstalk.


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Do not deform, do not bend, do not stretch, do not staple, do not run parallel with powercables, and do not run Ethernet cables near noise inducing components.

Basic Theory:

By looking at a T-568A UTP Ethernet straight-thru cable and an Ethernet crossover cable

with a T-568B end, we see that the TX (transmitter) pins are connected to the corresponding

RX (receiver) pins, plus to plus and minus to minus. You can also see that both the blue and

brown wire pairs on pins 4, 5, 7, and 8 are not used in either standard. What you may not

realize is that, these same pins 4, 5, 7, and 8 are not used or required in 100BASE-TX as well.

So why bother using these wires, well for one thing its simply easier to make a connection

with all the wires grouped together. Otherwise you'll be spending time trying to fit those tiny

little wires into each of the corresponding holes in the RJ-45 connector.

Inainte sa vedem cum se face un cablu cross-over sa vedem cum functioneaza o retea din

punct de vedere electronic.

1. Functionarea unei retele UTP

La nivel fizic retelele UTP sunt formate din cabluri mufate cu mufe RJ45 conectate la

calculator sau switch. Probabil toti stiti cum arata un cablu UTP din exterior dar sa vedem in

interior ce se intampla. In interior, cablul UTP e format din 4 perechi de cabluri mai mici

rasucite. Perechile sunt formate dintr-un fir colorat (portocaliu, verde, albastru si maro) si un

fir alb cu o linie de aceeasi culoare.Concret, un cablu UTP arata asa:


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Din cele 4 perechi de cabluri, sunt folosite doar doua la alegere. Pentru tutorialul prezent am

ales verde si portocaliu, celelalte doua perechi fiind nefolosite. Pe cele doua perechi se face

comunicarea intre calculatoare sau intre calculator si switch. O pereche e folosita pentru

transmiterea semnalului (+/- Tx) iar cealalta pereche pentru receptionarea semnalului (+/-

Rx).Daca luati o mufa si priviti spre lamelele de contact veti vedea ca sunt 8 la numar. Fiecare din

cele 8 lamele are un rol bine determinat. In figura de mai jos se poate vedea mufa impreuna cu

cele 8 lamele.


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Acestea functioneaza in felul urmator: primele doua lamele/contacte sunt folosite pentru

transmiterea semnalului. Urmatoarea este folosita pentru +Rx, urmeaza doua lamele libere si

apoi inca una pentru -Rx. Dupa cum vedeti +Rx si -Rx sunt separate de doua cabluri (o

pereche) pentru a evita interferentele care pot aparea. Pe cele patru lamele/cabluri se face

comunicarea, restul fiind lipsite de importanta.

2. Comunicarea cross-over

Daca nu folositi un switch aveti nevoie de un cablu cross-over pentru a face doua

calculatoare sa comunice intre ele. Ce face cablul cross-over? Tine locul switch-ului.

Simplificand, switchul are rolul de a trimite impulsurile de pe Tx peRx si invers. Daca nu

exista un switch trebuie sa inversam cablurile inainte de a face mufarea pentru caRx-ul unui

calculator sa ajunga in Tx-ul celuilalt si invers. Dupa cum va dati seama trebuie doar sa

inlocuim locul perechii verzi cu locul perechii portocalii. Adica, daca la prima mufa am avut

cablurile de forma (numerotate incepand din partea stanga):

Code:[Select]1. Alb-Verde (+Tx)

2. Verde (-Tx)

3. Alb-Portocaliu (+ Rx)

4. Albastru

5. Alb-Albastru

6. Portocaliu (- Rx)

7. Alb-Maro

8. Maro

la a doua inversam perechile de comunicare, ca sa avem:

Code:[Select]

1. Alb-Portocaliu (+ Tx)2. Portocaliu (- Tx)


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3. Alb-Verde (+ Rx)

4. Albastru

5. Alb-Albastru

6. Verde (- Rx)

7. Alb-Maro

8. Maro

Restul culorilor si-au pastrat pozitiile pentru ca nu prezinta nici un interes din puct de vedereal comunicarii.

Dupa cum vedeti s-a creat o asociere:

Code:[Select]1. + Tx < -> + Rx

2. - Tx < -> - Rx

3. + Rx < -> + Tx

4. neutilizat

5. neutilizat

6. - Rx < -> - Tx

7. neutilizat

8. neutilizat

Adica, ce trimite un calculator receptioneaza celalalt. Suficient ca sa facem o comunicaresimpla intre doua calculatoare. Bun, acum sa vedem cum se face un cablu cross-over.

3. Scule necesare

Pentru crearea unui cablu avem nevoie de un cleste de sertizare, doua mufe pentru UTP

(RJ45) si o bucata de cablu UTP. Pentru o cablare corecta, cablul UTP va fi multifilar.

Intotdeauna in retelele UTP se foloseste cablu unifilar pentru crearea structurii si cablu

multifilar pentru conectarea calculatoarelor la prize sau la hub/switch daca distanta permite. In

tutorialul prezent folosesc cablu unifilar pentru ca doar asta am gasit pe aici, dar voi nu

trebuie sa faceti la fel


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4. Pregatire

Inainte de utilizare trebuie sa pregatim mufele si cablul. La un capat al cablului se scoate

izolatia folosind lama clestelui de sertizare.

Apoi, aranjam cablurile dupa cum am spus mai sus. La un capat ordinea cablurilor va fi:Code:[Select]1. Alb-Verde (+Tx)

2. Verde (-Tx)

3. Alb-Portocaliu (+ Rx)

4. Albastru

5. Alb-Albastru

6. Portocaliu (- Rx)

7. Alb-Maro

8. Maro

Iar la celalalt capat,

Code:[Select]1. Alb-Portocaliu (+ Tx)

2. Portocaliu (- Tx)

3. Alb-Verde (+ Rx)

4. Albastru

5. Alb-Albastru

6. Verde (- Rx)

7. Alb-Maro

8. Maro

Trebuie sa aveti grija sa nu lasati cablurile

mai lungi decat e necesar. Normal se


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pastreaza rasucite in interiorul izolatiei

pentru a nu aparea interferente. Daca

cumva ati scos prea multa izolatie, taiatidin cabluri lasand doar ~1.5cm de la

capatul izolatiei. Inainte de a insera

cablurile in mufa, ar trebui sa arate cam

asa:

5. Mufarea

Dupa ce aveti firele pregatite inserati-le in

mufa in asa fel incat o parte din izolatie sa

intre in interior pentru a fi prinsa. Ajuta

mult rezistenta rezistenta cablului, in mod


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deosebit daca e un cablu care necesita

utilizare in mai multe locuri si conditii.

Dupa ce ati introdus cablurile in mufa, cuatentie sa ajunga pana in capat, mufa se

introduce in clestele de sertizare pentru a

fi inchisa.

Dupa ce ati inchis mufa repetati opeatia si

la celalalt capat, bineinteles inversand

pozitiile cablurilor de comunicare.

La final ar trebui sa aveti un cablu cu

doua mufe, pregatit sa faca comunicarea

intre doua calculatoare.

Daca aveti nelamuriri, astept intrebari


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In functie de natura dispozitivelor ce

urmeaza a fi interconectate, se folosescuzual 2 tipuri de cabluri, straight-through

si crossover, dupa cum urmeaza:

* cablul de tip straight-through pentru

conectarea:

* Switch la router* Switch la PC sau server

* Hub la PC sau server

* cablul de tip crossover pentru

conectarea:

* Switch la switch

* Switch la hub

* Hub la hub

* Router la router

* PC la PC

Connecting Two Computers Together

September 23, 2011

The Fastest and Safest method to connect two computers together is by using the

crossover cable. You can then transfer files and data from one computer to another.

Here is a Detail Tutorial about Connecting Two PCs Using Crossover Cable.

Basic Requirement For Connection


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1. Two computers must have a network card installed on them.

2. Crossover cable (Yellow Cat 5 Cable, you can get it from a local computer shop).

Crossover Diagram

Cat 5 Cable

The Procedure For Connecting The PCs Is Given Below

1. First make sure both computers are switched off.

2. Connect one end of the crossover cable in the network card of computer 1 and the

other end in network card of computer 2.

3. Now turn on both the computers.

4. Log-in on both the computers using your user name and password and wait until

windows is loaded.

5. Now with the right mouse button, Click on My Computer ->Properties


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6. Click on Computer Name Tab and see the Workgroup Name Listed On Computer 1

(Usually MYHOME)

7. Now On Computer 2 we have to change the workgroup name similar to that of

Computer 1 i.e MYHOME.

8. On Computer 2 Click on the change button

9. Type the same workgroup name as listed in Computer 1 i.e MYHOME


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10. Restart both the computers and after that they will be in the same workgroup i.e

MYHOME.(Make Sure that they are in same workgroup by identifying the workgroup

name)

11. With the right mouse button click on Windows (C:) or Local Disk (C:) in My

Computer and click on sharing and security.

12. Now Click on the link that says If you understand the risk but still want to share

the root of the drive, click here


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13. After that Click on the link that says If you understand the security risks but want

to share files without running the wizard, click here.

14. Now Select Just enable file sharing.


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15. Now Select the checkboxes that says Share this folder on the network and Allow

network users to change my files. The hard drive name will be the default share

name.

16. A dialog box with Setting Folder Permissions will appear.

17. Now a hand will appear holding the hard disk drive, indicating that it is now shared.


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18. Now to view the other computer on your network go to control panel ->

Network Connections->My Network Places ->View Workgroup Computers

on the left side of the screen.

Connect Two Computers using a Crossover Cable

1

Hello friends!

Did you know? Connecting two computers together using a crossover cable is the fastest and

safest method of transferring your files and data from one computer to another via cable. Data

transfer through a direct crossover cable connection between two computers cannot be

intercepted like wireless signals can. If you have a lot of music, pictures or large files that you

want to transfer to (or share with) another computer, then using a crossover cable is an

excellent alternative to using pendrive or cds.

This cable can be used to directly connect two computers to each other without the use of a

hub or switch. The ends on a crossover cable are different from each other, whereas a normal

'straight through' cable has identical ends.

When connecting two computers together without the use of hub or switch a "crossover

cable" must be used.

Did you know? Using a crossover cable is the easiest and lowest cost method of home

networking. Easily connect two computers together by means of a single crossover cable.

Connecting Two Windows XP Computers Together using a Crossover Cable to Transfer or

Share Files Between them

Basic Requirements (what you will need to complete this

tutorial)1. Two computers with a network card installed in each one of them)

2. 1 Crossover cable (Category 5 or CAT5e cable).

Note: If you want to make a crossover cable then read this tutorial
http://www.trickstoday.com/2012/02/connect-two-computers-using-crossover.htmlhttp://unlimitedesolutions.blogspot.in/2012/02/how-to-make-crossover-cable.htmlhttp://unlimitedesolutions.blogspot.in/2012/02/how-to-make-crossover-cable.htmlhttp://www.trickstoday.com/2012/02/connect-two-computers-using-crossover.htmlhttp://unlimitedesolutions.blogspot.in/2012/02/how-to-make-crossover-cable.htmlhttp://unlimitedesolutions.blogspot.in/2012/02/how-to-make-crossover-cable.html


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Preparations

Step 1: Make sure both computers are turned off.

Step 2: Plug each end of the crossover cable into a network port on the back of each

computer.

Step 3: Turn both computers on (it does not matter which one you turn on first).

Step 4: Sign-in to Windows on both computers, as you normally do.

Step 5: Wait until both computers have fully loaded Windows and all startup programs (your

mouse pointer will be the normal arrow shape and the programs that load in the system tray

(usually located at the bottom right side of the screen, to the left of the time-clock) will all be

there when the system is ready to use for configuration).

Configuration

Step 6. Select one of the computers to complete the rest of the process.

Step 7. Open The Network and Sharing Center. Click "Start," then "Control Panel," then

"Network and Internet." Lastly, click "Network and Sharing Center."

Step 8. Double click the "Unidentified Network" icon.

If you have more than one network, this icon will be identified as "multiple networks."

Step 9.In Network, clickthe information bar. Next, click on "Turn on networkdiscovery

and file sharing." If you are prompted for a password or confirmation, type it in or provideconfirmation.

Step 10. Choose whether to make your network private or public. Generally, private is the

best option.

connecting two computers together

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