April 22, 2025

Wired Network

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What is a wired network?

A wired network uses physical cables — Ethernet, fibre-optic, or coaxial — to connect devices and transfer data. Unlike Wi-Fi, which relies on radio signals, a wired connection provides a direct physical link between devices, delivering faster speeds, lower latency, and stronger security. Wired networks are the standard for offices, data centres, and any environment where a reliable, high-performance connection is non-negotiable.

Key components of a wired network

Cables

Ethernet cables

The most common wired network cabling. Choose the right category for your speed and distance requirements:

Cable type Max speed Bandwidth Max distance Typical use
Cat5e 1 Gbps 100 MHz 100m Home / small business
Cat6 1–10 Gbps 250 MHz 55–100m Offices
Cat6a 10 Gbps 500 MHz 100m Data centres
Cat7 10 Gbps 600 MHz 100m High-security environments
Cat8 40 Gbps 2000 MHz 30m Data centres, server rooms

Fibre-optic cables

Transmit data via light pulses. Ideal for long distances, immunity to electromagnetic interference, and maximum throughput. Commonly used for building-to-building links and ISP connections.

Coaxial cables

Found in legacy setups and some broadband internet connections. Generally replaced by Ethernet in modern network infrastructure.

Networking hardware

  • Ethernet switches — connect multiple devices on a local area network (LAN). See our glossary: what is a networking switch.
  • Network router — routes data between your LAN and the internet. See: what is a networking router.
  • Modem — interfaces with your internet provider’s infrastructure.
  • Repeaters — extend the range of wired cabling runs beyond standard limits.
  • Network Interface Card (NIC) — required for desktop computers without a built-in Ethernet port.
  • DHCP server — automatically assigns IP addresses to devices on the network. See: what is a DHCP server.

How wired networks work

Data is transmitted as electrical signals through copper cables (or light pulses through fibre-optic). Devices communicate using two methods: full-duplex (simultaneous send and receive) or half-duplex (one direction at a time). Modern Ethernet is almost always full-duplex.

Common network topologies

  • Star — all devices connect to a central switch or router. The most common topology in modern offices. A single cable failure only affects one device.
  • Bus — devices connected along a single cable run. Legacy — rarely used today.
  • Ring — devices form a closed loop. Used in older Token Ring environments.

Types of wired networks

Ethernet (twisted pair)

The standard for most business and home networks. Uses Cat5e to Cat8 cabling with RJ45 connectors. Supports speeds up to 40 Gbps with Cat8. Easy to install, maintain, and scale.

Fibre-optic

Used for long-distance runs, building interconnects, and high-throughput environments. Immune to electromagnetic interference. More expensive to install but the performance ceiling is significantly higher than copper.

Legacy copper (coaxial, telephone line)

Older infrastructure including DSL and cable internet. Largely replaced by Ethernet and fibre in modern deployments.

Wired vs wireless networks

Feature Wired Wireless
Speed Higher, stable transfer speeds May fluctuate with interference or distance
Security Physical access required — harder to intercept Vulnerable to unauthorised access without strong encryption
Mobility Limited — devices must be cabled High — supports laptops, phones, tablets
Reliability Very reliable, no dead spots Can suffer from interference, dead zones
Latency Lower — better for VoIP, video calls, gaming Higher — variable depending on conditions
Setup complexity Requires cabling infrastructure Easier to deploy, harder to secure

For most Australian businesses, the recommended approach is a hybrid network — wired connections for desktops, servers, and AV equipment, with Wi-Fi for laptops and mobile devices. See our guide on managed IT services for help designing the right network for your business.

Setting up a wired network: step-by-step

Step 1 — Plan your network

  • Count how many devices need wired connections and where they’re located.
  • Choose a switch with enough ports (plus 20% spare capacity for growth).
  • Select a commercial-grade router that supports your internet plan speed.
  • Map cable runs before purchasing materials to estimate cable lengths accurately.

Step 2 — Choose and run your cables

  • Use Cat6 or Cat6a for most office deployments.
  • Run cables through walls, ceiling cavities, or cable raceways.
  • Keep runs under 90m (leaving 10m for patch leads).
  • Label every cable and endpoint — this saves significant time during troubleshooting.

Step 3 — Connect your devices

  • Plug Ethernet cables from your switch ports to each device.
  • Connect the switch uplink to your router’s LAN port.
  • Connect the router WAN port to your modem or NBN connection device.
  • Add a NIC to any desktop without a built-in Ethernet port.

Step 4 — Test and verify

  • Use a cable tester to confirm each run has continuity and no wiring faults.
  • Confirm devices are receiving IP addresses (via DHCP or static assignment).
  • Run a speed test from a wired device to verify throughput against your plan speed.
  • Check the switch port LEDs — solid or blinking green indicates a healthy link.

Advantages and disadvantages

Advantages

  • Consistent, high-speed connection with low latency
  • Stronger security — physical access is required to intercept traffic
  • No dead spots or signal interference
  • Stable performance under heavy network load
  • Supports PoE (Power over Ethernet) for cameras, phones, and access points

Disadvantages

  • Limited mobility — users must be near a network port
  • Cabling infrastructure adds upfront installation cost and time
  • Scaling requires additional switches and cable runs
  • Cable management can become complex in large environments

Best practices

  • Use Cat6a as the minimum standard for any new office cabling — it future-proofs against 10 Gbps adoption.
  • Deploy managed switches so you can monitor port utilisation, VLANs, and Quality of Service (QoS) settings.
  • Segment your network using VLANs to isolate guest Wi-Fi, IoT devices, and staff devices from each other.
  • Secure switch ports — disable unused ports and use 802.1X authentication in higher-security environments.
  • Document your network: cable labels, IP address assignments, and switch port maps save hours during faults.

Frequently asked questions

What is a wired network?
A wired network connects devices using physical cables — typically Ethernet — to transfer data. It delivers faster speeds, lower latency, and better security than wireless, making it the preferred choice for offices, data centres, and performance-sensitive environments.

Can I use a wired network with gaming consoles or smart TVs?
Yes. Plug an Ethernet cable directly into your console or smart TV’s LAN port for a faster, more stable connection than Wi-Fi — particularly useful for streaming 4K content or online gaming.

How many devices can I connect?
As many as your switch supports. A standard 24-port switch handles 24 wired devices, and additional switches can be stacked or daisy-chained to expand capacity.

What cable do I need for high-speed internet?
Cat6a supports 10 Gbps up to 100m and is the recommended standard for new office installations. Cat8 supports 40 Gbps but is typically reserved for short data centre runs.

How do devices get IP addresses on a wired network?
Your router runs a DHCP server that automatically assigns IP addresses when a device connects. For servers or printers, static IP addresses are manually configured for consistency.

Related glossary terms

Need help designing or upgrading your business network?

Enabla Technology designs, installs, and manages wired and wireless networks for Australian businesses. Whether you’re cabling a new office, upgrading aging infrastructure, or troubleshooting persistent network issues, our team handles it end-to-end. Get in touch to speak with a network specialist.

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