The cable that connects to my rj45 only has 4 cables, blue, orange, blue stripe, orange stripe. When I connect them to their corresponding ports, there is no internet connection.(Blue = 4, Orange = 6, Blue stripe = 5, Orange stripe = 3) How can I connect them so that I get a connection? Any help would be appreciated.


2 Answers 2


Your cable is not a proper UTP network cable as defined by TIA/EIA 568. In fact, the pairs used by the 10Base-T (10 Mbps) and 100Base-TX (100 Mbps) ethernet are 1-2 and 3-6. The 1000Base-T (1 Gbps) standard requires all four pairs (wired as 1-2, 3-6, 4-5, 7-8).

You must use a TIA/EIA wiring standard, either TIA/EIA T568A (normally used for home networking) or TIA/EIA T568B (usually used in business networking). Either wiring standard will work, but you probably want the cable wired straight-through. You may need a crossover (one side T568A and the other T568B) under certain circumstances.

This is the TIA/EIA 568 wiring (for both A and B):

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The bottom line is that your cable cannot be used for a network cable.

  • Hmm, when I connect to Blue 8, Orange 4, Blue Stripe 1, Orange Stripe 3, I get a connection Commented Dec 19, 2018 at 22:04
  • That will not actually work. If you really wired it that way, you cannot send data across that link.
    – Ron Maupin
    Commented Dec 19, 2018 at 22:08
  • Blue 8, Orange 6, Blue Stripe 1, Orange Stripe 3 worked with one of my desktops but not the other Commented Dec 19, 2018 at 22:37
  • Hmm strange. Confused, I have here a cable labeled (printed on the cable) as A/TIA -568-B 2 UTP CAT5E and has 4 wires. From left to right (looking at top of the connections with the head of the cable, the connector pins on top pointed to yourself): PIN1:NC, PIN2:NC, PIN3:RED, PIN4:NC, PIN5:NC, PIN6:ORANGE, PIN7:BLUE and PIN8:WHITE. This a crossover cable, bought it as crossover cable so on the other side it may be little different. CAT5E is rated for 1Gbps. So this old 90's cable is fake and not CAT5E? However, works great, just wondering.
    – Codebeat
    Commented May 31, 2021 at 2:00
  • Category-5e was published in 1999 (Category-5 was deregistered in 2001). There is a lot of crap cable sold, and many manufacturers have run into legal problems. You seem to have the pin numbers backward (1, 2, 3, and 6 are required for even 10 or 100 Mbps ethernet both straight-through and crossover). Those may be the only pins connected, but the other wires may be in the cable and cut off (not in the connector). The standard requires all four pairs (eight wires).
    – Ron Maupin
    Commented May 31, 2021 at 2:23

I finally got it to connect by following the 10BASE-T 100BASE-TX column that Ron posted. Blue strip 1, Blue 2, Orange Strip 3, Orange 6.

  • 1
    10/100 Base Ethernet only requires 2 pairs, 1000 Base Ethernet requires the 4 pairs. Commented Jan 25, 2021 at 14:12

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