UTP Cable Wiring Order (T568A/B)

For UTP cable wiring order, matching both ends to the same standard gives a straight-through cable, and using different standards gives a crossover cable. A UTP (Unshielded Twisted Pair) cable has eight wires twisted into four pairs with no outer shield, and an RJ45 connector, the standard 8-pin connector, goes on each end.

UTP cable wiring order comes in two standards, T568A and T568B.

✅ UTP Cable Wiring Order: T568B

The T568B layout is the most commonly used, mainly for a straight-through cable. A straight-through cable connects different kinds of devices.

White/Orange – Orange – White/Green – Blue – White/Blue – Green – White/Brown – Brown

✅ UTP Cable Wiring Order: T568A

The T568A layout is also used for straight-through cables and is preferred in some environments.
A crossover cable is wired with T568A on one end and T568B on the other, and communication between devices of the same kind is what it is used for.

White/Green – Green – White/Orange – Blue – White/Blue – Orange – White/Brown – Brown

✅ Recommended Reading

🧭 Networking articles 9 items

🔍 Lookup tools 3 📶 Network layers 3 🔌 Devices and connections 3

Tools · IP

Check My IP: Look Up Public IP and Location

After plugging in the cable, check the address you go out with. It shows results from three GeoIP databases side by side.

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Tools · Domains

WHOIS Domain Lookup · Nameserver Check

Look up a domain’s registrar, expiry date, and DNS records on one screen. Supports about 1,400 TLDs.

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Tool · Encoding

UTF-8 Converter: EUC-KR Conversion and Broken Korean Text Recovery

When Korean text is garbled in a device config file or log, paste it in to restore it. You can also save it in a different encoding.

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Layer 1 · Physical

Physical Layer: Converting Data into Electrical Signals

This is the layer UTP cable belongs to. It covers network cards, twisted-pair cable, and the straight-through vs crossover distinction.

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Layer 2 · Data link

Data Link Layer

The stage where the electrical signals arriving over the cable are grouped into data. It covers the roles of the network card and the switch.

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Overview · Layer map

OSI 7 Layers | TCP/IP 4 Layers

A map that splits communication into seven stages, from the cable to the application. A table also shows how it lines up with the four TCP/IP layers.

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Devices · Layer 1

Repeaters and Hubs (Physical Layer Devices)

Devices used at layer 1, the same layer as the cable. It covers repeaters, which regenerate the signal, and hubs, which split it across ports.

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Layout · WAN/LAN

Network diagram

A picture of where the cable you made actually gets plugged in. It uses a home network and a data center as examples.

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Cables · Video

4 Types of Monitor Cables (VGA, DVI, HDMI, DP)

The cable you handle most after the LAN cable. It covers the differences between the four connectors and what to do when the ports do not match.

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Collected by topic: lookup tools you can use right away, layer concepts, and devices and connections.

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