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「シールド付きEthernetケーブルが必要」— 実際に重要な場面

STP vs UTP ethernetケーブル：ほとんどの家庭にシールドは不要で、不適切なシールドは状況を悪化させる可能性。

## The Myth

Shielded (STP/FTP) Ethernet cable is always better than unshielded (UTP).

## The Reality

For most homes and offices, **unshielded Cat6/Cat6a is fine**.

## When You DO Need Shielding

- Running cable parallel to power lines (within 30cm)
- Industrial environments with heavy electromagnetic interference
- 10 Gbps runs over 55m+ (Cat6a STP recommended)
- Data centers and server rooms

## When Shielding HURTS

Improperly grounded shielded cable is **worse** than unshielded because:
- The shield becomes an antenna for interference
- Ground loops between devices cause noise
- You need shielded jacks, patch panels, and proper grounding throughout

## Recommendation

- **Home/Office**: Cat6a UTP (unshielded) — sufficient for 10 Gbps
- **Near power cables**: Cat6a F/UTP (foil shield, simpler grounding)
- **Industrial/Datacenter**: Cat6a S/FTP with proper grounding

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