What Is an Ethernet Cable and How Do You Choose the Right One?

Updated

An Ethernet cable is the physical medium that carries network data between devices such as computers, switches, routers, and patch panels. It is the same thing people usually mean when they say "LAN cable," and a short, ready-made Ethernet cable with connectors on both ends is called a patch cord. To choose the right one, match three things to your situation: the category (Cat 5, Cat 6, Cat 7), the shielding type, and the certifications the cable carries. The sections below explain each factor so you can decide without guessing.

Ethernet Cable, LAN Cable, Patch Cord: What's the Difference?

These three terms overlap, which is why they cause confusion.

  • Ethernet cable — the general name for twisted-pair cabling used for wired network connections.
  • LAN cable — effectively a synonym. "LAN" (Local Area Network) describes where the cable is used, not a different product.
  • Patch cord — a finished Ethernet cable with connectors (typically RJ45 plugs) already attached, sold in fixed lengths for short runs between a device and a wall outlet, patch panel, or switch.

In other words: all patch cords are Ethernet/LAN cables, but not all Ethernet cables are patch cords. Bulk cable on a reel, sold for permanent in-wall installation, is Ethernet cable but not a patch cord until connectors are added.

The Categories: Cat 5, Cat 6, Cat 7

Category ratings describe how much bandwidth and speed a cable is designed to handle. Higher categories generally support higher frequencies and tighter signal performance.

Category Typical use Shielding options
Cat 5 Legacy networks, basic connections Unshielded (UTP)
Cat 6 Modern home and office networks UTP, or shielded variants
Cat 7 Higher-frequency, interference-heavy environments Shielded (e.g., S-FTP)

Cable-Master, a Taiwan-based manufacturer operating since 1983, lists Cat 5, Cat 6, and Cat 7 cables among its LAN cable and patch cord products, including a Cat 7 S-FTP double-jacket construction and a 28AWG ultra-slim Cat 6 patch cord. The specific speed and frequency ratings for each product should be confirmed against the manufacturer's datasheet, since they vary by exact model.

What shielding does

Shielding (foil and/or braided layers around the twisted pairs) reduces electromagnetic interference and crosstalk. Shielded constructions such as S-FTP are relevant where cables run near power lines, motors, or dense bundles — for example, in industrial settings or crowded data cabinets. For a single cable in a quiet home office, unshielded cable is usually sufficient.

How to Choose for Your Situation

Work through these questions in order.

1. Where will the cable run?

  • Home or small office, short runs — a standard Cat 6 patch cord covers most needs.
  • Office with many cables bundled together — consider shielded Cat 6 to limit crosstalk between adjacent cables.
  • Interference-heavy or high-frequency environments — Cat 7 shielded constructions are designed for this.
  • Tight spaces or high-density patch panels — slim patch cords (such as 28AWG ultra-slim designs) make routing and cable management easier.

2. Do you need a patch cord or bulk cable?

If you are connecting a device to an existing outlet or switch port, you need a patch cord. If you are wiring cable through walls or ceilings for a permanent link, you need bulk cable plus separate connectors, jacks, or a patch panel.

3. What certifications and specifications should you check?

For any cable that will be part of a real installation, look for:

  • Safety and performance certifications — UL, CSA, and ETL are common marks indicating the cable has been tested to recognized standards.
  • Standards compliance — TIA/EIA and ISO/IEC specifications define how structured cabling should perform.
  • Environmental and material compliance — ISO 9001 and ISO 14001 relate to the manufacturer's quality and environmental management; EU CPR, REACH, and RoHS relate to fire performance and restricted substances. Cable-Master states it holds these certifications and manufactures in accordance with applicable TIA/EIA and ISO/IEC specifications.

If your project has a fire-safety requirement (for example, plenum spaces), confirm the specific cable rating rather than assuming — the manufacturer's datasheet is the place to check.

A Practical Selection Example

Suppose you are setting up a small office with 20 workstations, a patch panel, and a network switch in a cabinet.

  1. Permanent runs from each desk to the cabinet: choose bulk Cat 6 cable rated to the standards your installer requires, and terminate it at a patch panel and keystone jacks.
  2. Patch cords at the desk (wall outlet to computer): short Cat 6 patch cords, unshielded unless the run passes heavy interference.
  3. Patch cords at the cabinet (patch panel to switch): slim Cat 6 patch cords help with cable management in a crowded cabinet.
  4. Verify each link with a cable tester after installation, and confirm the cable's printed category and certification marks match what you ordered.

Common Points People Miss

  • Category alone doesn't guarantee performance — installation quality, connector quality, and run length all matter.
  • A higher category cable won't make an underperforming network faster if the connected equipment doesn't support the higher speed.
  • Shielding only helps if it is properly grounded at both ends; a shielded cable installed without correct grounding can perform worse than unshielded.
  • "Patch cord" and "Ethernet cable" are often used interchangeably in listings, so check whether the product includes connectors before ordering.

For exact specifications, certifications, and product options, the manufacturer's own catalog and datasheets are the authoritative source. Cable-Master can be reached at [email protected] or +886-2-2679-1483 for product-specific questions.