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How to Choose the Right Length for Your LAN Cable

When connecting devices on a local area network (LAN), choosing the right length for your LAN cable is crucial. An overly long cable can introduce signal degradation and performance issues, while a cable that’s too short can limit flexibility and placement options. Here’s a comprehensive guide to help you select the optimal length for your LAN cable.

Factors to Consider

Device Placement

Determine the distance between the devices you want to connect. Measure the exact distance using a measuring tape or a cable tester. Avoid estimating or guessing the length, as this can lead to incorrect choices.

Signal Loss

LAN cables can experience signal loss over long distances. The longer the cable, the greater the loss. Cat5e and Cat6 cables can typically handle up to 100 meters (328 feet) without significant signal degradation. However, for longer distances, consider using a Cat6A or Cat7 cable, which can support distances of up to 150 meters (492 feet).

Cable Management

After accounting for the distance between devices, consider cable management. Longer cables can be more difficult to organize and can create unsightly clutter. Plan for sufficient slack to allow for cable movement and connections without excessive tension. Aim for a cable length that strikes a balance between device placement and ease of cable management.

Choosing the Right Length

Short-Distance Connections

For distances less than 5 meters (16 feet), a 3-meter (10-foot) cable is ideal. This provides sufficient slack for easy connections and avoids excessive cable management issues.

Mid-Range Distances

For distances between 5 and 15 meters (16-50 feet), a 10-meter (33-foot) cable is a good choice. It offers ample length for most applications without becoming overly cumbersome.

Long-Distance Connections

For distances over 15 meters (50 feet), consider a 20-meter (66-foot) or longer cable. Ensure the cable type you choose supports the distance required to maintain optimal signal quality. For distances exceeding 100 meters (328 feet), consult a networking professional for guidance.

Additional Considerations


Consider future needs and potential device additions. Choosing a cable slightly longer than the immediate requirement allows for flexibility and avoids the need for replacement in the future.

Cable Type

Different LAN cable types have varying distance limitations. Verify the maximum distance supported by the cable you intend to use. For example, Cat5e cables typically handle up to 100 meters, while Cat6A cables can support up to 150 meters.

Installation Environment

Consider the installation environment and any potential obstacles or limitations. Measure the exact distance along the intended cable path to ensure the cable length is sufficient. Allow for additional length if the cable will be routed through walls, ceilings, or conduit.

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