Network: How to Make CROSS & STRAIGHT cable

Discussion in 'Tutorials' started by 47shailesh, Feb 23, 2007.

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  1. 47shailesh

    47shailesh Security Exp

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    STEP 1: Choose the right cable…
    1. To Connect PC to PC à Cross Cable.

    2. To Connect PC to HUB/SWITCH/ROUTER
    à
    Straight Cable.

    3. To Connect HUB/SWITCH/ROUTER to HUB/SWITCH/ROUTER
    à
    Straight
    Cable

    STEP 2: Understanding CAT 5 Cables…

    Wires: CAT 5 Cable has 4 pairs of copper wire inside it.

    Colors: Standard cables has BROWN, BROWN WHITE, GREEN, GREEN-
    WHITE, BLUE, BLUE WHITE, ORANGE, ORANGE WHITE.


    STEP 3:
    Making Straight Cable…

    Nomenclature: let us first give a number scheme for cabling which we will
    follow throughout this tuto. BROWN (8), BROWN WHITE (7),
    GREEN (6), GREEN WHITE (3), BLUE (4),
    BLUE WHITE (5),
    ORANGE (2), ORANGE WHITE (1)

    Requirements: Two RJ45 Connectors, Crimping tool & CAT 5 cable of desired
    length(less than 250 meters).

    STEP 3.1:


    There are two standards adopted for Cabling EIA/TIA 568A & EIA/TIA 568B.

    When you use single standard (either EIA/TIA 568A or EIA/TIA 568B) on both the end of cable then the resulting cable is STRAIGHT CABLE.

    On the other hand if you use different cabling standard on the ends of cable then the resulting cable is CROSS CABLE

    I’ll use EIA/TIA 568B standard for creating cross and straight cable

    The figure below very well define the EIA/TIA 568B standard…

    [​IMG]

    1. Remove the covering of CAT 5 cable.
    2. Straighten the eight wires of the cable.
    3. Using Crimping tool’s cutter cut the end of wires so that they are of same length
    4. Arrange the wire in order 1, 2, 3, 4, 5, 6, 7 & 8 respectively as I have mention or as shown in the diagram.
    5. Insert the arranged cable in the RJ45 connector with clip pointing down exactly as shown in the figure.
    6. In crimping tool insert the head of RJ45 connector and crimp (press) it hardly.
    7. Follow same step with same color order for the other end of cable too.
    8. The wire you made by following these steps is a STRAIGHT cable.

    STEP 4: Making CROSS Cable…

    Of the Eight wires in Cat 5 not all are used for data transfer when using 100Mbps Ethernet card. Only 2 pairs of cable are used i.e. 2 wire for transmitting signal and two wires for receiving signal.

    Following diagram describes what I want to say:


    [​IMG]



    So now you can guess why we have to make CROSS CABLE for connecting same kind of devices. Because if use same color coding on both the side than transmitter of one m/c will send data to transmitter of another and data packets will lost, so we have to change wiring code so that transmitter of one connects to reciver of other and vice-versa.
    Reference diagram:
    [​IMG]


    Here are the Steps:
    Steps 1 to 6 are same as for STRAIGHT through cables
    7. Only difference is in color coding of other side of wire.
    8. Wire that is on 1st number on A-side (one end) should be on 3rd number on B-
    side (other side) & vice-versa.

    9. Wire that is on 2st number on A-side (one end) should be on 6rd number on B-
    side (other side) & vice versa.

    10. Now Crimp the RJ45 connector.
    11. Your CROSS wire is completed.

    digrams taken from net for representation
     
    Last edited: Feb 23, 2007
  2. shashank4u

    shashank4u New Member

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    nice work that will help the noobs out there..
     
  3. crystal_pup

    crystal_pup 101101

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    Good one dude...kip it up!!!!

    Cheers,
    Kunal :p
     
  4. sysfilez

    sysfilez Welcome To The Jungle

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    nice post.
     
  5. racevthme

    racevthme New Member

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    me tryin for this since a lot of days
    thanq
     
  6. caleb

    caleb New Member

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    I agree...good work
     
  7. stiffuser

    stiffuser New Member

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    Hai ! Buddy,

    Thanx's for your brief explaination of Network Cabling...

    ============>>>>100%
     
  8. topgear

    topgear Fast 'N' Furious Staff Member

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    old for me but very useful for newbies :D
    Anyway Nice
     
  9. NucleusKore

    NucleusKore TheSaint

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    Nice post
     
  10. Garbage

    Garbage God of Mistakes...

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    nice !!

    Thanks dear...
     
  11. QwertyManiac

    QwertyManiac Commander in Chief

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    Didn't he pull this one off Thinclients' site?
     
  12. sauravktr

    sauravktr New Member

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    Good work....thanks 4 ur effort
     
  13. gowtham

    gowtham New Member

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    tnx for the effort!
     
  14. nvidia

    nvidia -----ATi-----

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    Nice tutorial[​IMG]
     
  15. PraKs

    PraKs New Member

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  16. vaibhavtek

    vaibhavtek Guest

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