USB vs USB-C: Understanding the Evolutions and Choosing the Right Connection

An essential standard for decades, the Universal Serial Bus (USB) has evolved significantly to keep pace with the growing speed and versatility demands of modern computer and audio-visual equipment. From traditional USB ports to the latest USB-C connectors, here is everything you need to know to optimize your connections.

Traditional USB (USB-A): The Historic Benchmark for Compatibility

First introduced on computers back in 1998 with USB 1.1, the USB interface quickly became the universal standard for connecting a vast array of peripherals: keyboards, mice, RS232 interfaces, network adapters, card readers, microphones, cameras, as well as audio/video capture and playback devices.

Speed Evolution Across Generations:

  • USB 2.0 (2000): Data transfer rates up to 480 Mbps.
  • USB 3.0: Speeds jumped to 5 Gbps.
  • USB 3.2: Rates reaching 10 to 20 Gbps depending on the variant.

Power Delivery Capabilities:

Traditional USB also supplies 5V power directly to lighter devices:

  • USB 2.0: Maximum power output of 2.5 W (5V / 0.5A).
  • USB 3.x: Maximum power output increased to 4.5 W (5V / 0.9A).

Thanks to its massive global install base, traditional USB remains the most universally compatible port for existing external peripherals.

USB-C: High-Speed Versatility

Now standard on modern laptops, smartphones, and monitors, the reversible USB-C connector represents a major technological leap by combining multiple signal streams into a single cable:

  • Ultra-Fast Speeds: Transfer rates ranging from 40 to 120 Gbps (via USB4 and Thunderbolt protocols).
  • All-in-One Functionality: Simultaneous transfer of data, high-definition video, audio signals, wired Ethernet connections, and laptop charging.

Major Limitation & Distance Constraints:

Due to high-frequency signals, USB-C is extremely sensitive to cable length—especially in professional AV and conference room environments. It is strongly advised to avoid cable runs longer than 2 meters (6.5 feet), as longer cables often cause signal degradation, display instability, or unexpected disconnects.

Best Practices for Meeting Rooms and Fixed AV Installations

If you want to use USB-C to connect a laptop to a room’s displays, cameras, and microphones, two main solutions are recommended:

  • The Docking Station Solution: Use a dedicated dock connected to the laptop via a short USB-C cable (under 50 cm / 20 inches). The dock charges the laptop while distributing audio/video signals (via HDMI) and peripheral controls (via USB 2.0/3.0 cables) under the table over longer distances to displays, projectors, cameras, and microphones.
  • The Dedicated Cable Solution (Separated Wiring): For fixed installations, whenever possible, combine a dedicated HDMI cable for display output with a separate USB 2.0/3.0 cable for peripherals (cameras, microphones, touchscreens). Running separate physical cables provides significantly higher stability over long-term use.

Summary and Conclusion

  • USB (USB-A): Guarantees universal compatibility with standard peripherals and rock-solid stability over typical cable lengths.
  • USB-C: Unmatched speed and versatility (video, power, data in one cable), ideal when paired with short cables or a dedicated docking station.