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Ethernet Cables

1. What Is a Network Cable?

A network cable is a physical wire used to connect devices so they can communicate and share data.

Common examples:

  • Computer ↔ Router
  • Router ↔ Switch
  • PC ↔ PC (older setups)
  • NAS / Printer / IP Camera ↔ Network

In most homes and offices, when people say “network cable”, they mean an Ethernet cable.

2. Why Do We Still Need Network Cables?

Even with Wi-Fi everywhere, network cables are still important because they are:

  • Faster – higher and more stable speeds
  • More reliable – no wireless interference
  • Lower latency – great for gaming, servers, and streaming
  • More secure – physical access required

That’s why desktops, servers, switches, and access points usually use cables.

3. The Most Common Type: Ethernet Cable

3.1 Twisted Pair Cable

Almost all Ethernet cables today are twisted pair cables.

Inside the cable:

  • 8 copper wires
  • Twisted into 4 pairs
  • Twisting reduces electromagnetic interference

These cables usually end with an RJ45 connector.

4. Ethernet Cable Categories (Cat)

You’ll often see names like Cat5e, Cat6, etc. “Cat” means Category.

Category Max Speed Max Distance Common Use
Cat5e 1 Gbps 100 m Home, office (still very common)
Cat6 1 Gbps (10 Gbps short) 100 m (55 m @ 10G) Better shielding, newer installs
Cat6a 10 Gbps 100 m Data centers, prosumer setups
Cat7 10 Gbps 100 m Shielded, less common
Cat8 25–40 Gbps 30 m Data centers only

Beginner tip:

👉 For most people, Cat5e or Cat6 is more than enough.

5. Shielding Types (UTP, STP, FTP)

Ethernet cables may or may not have shielding.

  • UTP (Unshielded Twisted Pair)
    • Most common
    • Cheap and flexible
    • Perfect for home use
  • STP / FTP (Shielded)
    • Extra metal shielding
    • Better against interference
    • Thicker, harder to install
    • Needs proper grounding

Rule of thumb: 🏠 Home → UTP

🏭 Factory / noisy environment → Shielded

6. RJ45 Connector

The plastic plug at the end of an Ethernet cable is called RJ45.

  • 8 pins
  • Clicks into place
  • Used by Ethernet ports on:
    • Routers
    • Switches
    • PCs
    • NAS devices

You’ll usually see tiny LEDs near the port:

  • Blinking = data activity
  • Color may indicate speed (device-dependent)

* 7. Straight-Through vs Crossover Cables

Straight-Through Cable

  • Same wiring order on both ends
  • Used for:
    • PC ↔ Router
    • Router ↔ Switch

Crossover Cable

  • Different wiring on each end
  • Used for:
    • PC ↔ PC (old hardware)

💡 Good news: Modern devices support Auto MDI-X, so you almost never need to care anymore.

* 8. Ethernet Cable vs Other Network Cables

Ethernet vs Fiber

  • Ethernet (copper)
    • Cheap, easy
    • Shorter distance
  • Fiber optic cable
    • Uses light, not electricity
    • Very long distance
    • Very fast
    • More expensive

Ethernet vs Coaxial

  • Coaxial is used for:
    • Cable TV
    • Cable modem (DOCSIS)
  • Ethernet is used after the modem inside your network

9. How to Choose the Right Network Cable

For most beginners:

  • ✅ Cat6 UTP
  • ✅ Length under 30 meters
  • ✅ Factory-made (not hand-crimped)
  • ✅ Known brand

Avoid:

  • Ultra-cheap “flat” cables for long runs
  • Cat7/Cat8 marketing hype for home use

10. Common Mistakes to Avoid

  • Bending cables too sharply
  • Running Ethernet parallel to power cables
  • Using outdoor cables indoors (or vice versa)
  • Buying Cat8 for a 1 Gbps router 😄

11. Quick Summary

  • Network cables connect devices physically
  • Ethernet cables are the most common
  • Cat5e / Cat6 are perfect for beginners
  • Wired networks are faster and more stable than Wi-Fi
  • You don’t need expensive cables for normal use