# Decoding USB Ports: How to Identify Speed and Capabilities Learn to interpret USB symbols and color codes for optimal device connections. - **Source:** [Engadget](https://www.engadget.com) - **Published:** 2026-08-15 - **Original article:** - **On Brifing:** https://brifing.si/s/3d237587-7d27-46cd-aebb-df8d90f62fc4 ## The Evolution of USB Standards USB 2.0 launched in 2000 with 480Mbps bandwidth - adequate for peripherals like mice even today. USB 3.0 arrived in 2008 as 'SuperSpeed' with 5Gbps, followed by USB 3.1 (10Gbps) in 2013 and USB 3.2 (20Gbps) in 2017. Each iteration delivered exponentially faster data transfer speeds. The naming was simplified in 2022 to USB 5Gbps/10Gbps/20Gbps respectively, eliminating confusing 'Gen' designations from earlier versions. ## Understanding USB Symbols The classic trident logo typically indicates USB 2.0. USB 3.x versions add 'SS' (SuperSpeed) markings with speed ratings (5/10/20Gbps). USB4 features the trident alongside numbers (20/40/80) and a half-circle. Thunderbolt connections use a lightning bolt with arrowhead logo and operate over USB-C. These visual cues help identify port capabilities at a glance without consulting manuals. ## Color Coding Explained Black/white ports usually signify USB 2.0, while blue typically indicates USB 5Gbps (formerly 3.0). Red ports denote either 10Gbps or 20Gbps speeds and often provide power when the system is off. Yellow ports offer similar always-on power functionality. Purple ports are manufacturer-specific. However, color coding isn't standardized - symbols provide more reliable identification of USB capabilities. ## The USB4 Revolution Introduced in 2019, USB4 delivers 20Gbps or 40Gbps speeds. USB4 2.0 (2022) pushes this to 80Gbps. For perspective, transferring 100GB takes 28 minutes over USB 2.0 but just 20 seconds via USB4. Note that USB4 exclusively uses USB-C connectors, though not all USB-C cables support these speeds - the underlying standard matters more than the physical connector type. ## Thunderbolt Advantages Thunderbolt connections use USB-C physical interface but guarantee higher performance. For example, Thunderbolt 4 mandates dual 4K display output capability - a feature USB4 doesn't guarantee. While Thunderbolt cables cost more, they deliver up to 40Gbps speeds, video output, and intelligent charging - making them premium solutions for power users and professionals. ## Power Delivery and Video Features A battery icon or 'PD' marking indicates Power Delivery support, enabling smart charging based on device needs. For video output via USB-C, look for DisplayPort Alt Mode support, often marked with the DisplayPort logo. These features demonstrate USB's evolution beyond data transfer into a comprehensive connectivity standard handling power, video, and high-speed data simultaneously. ## Purchasing Considerations When buying USB cables, carefully check packaging for specific speed ratings (5Gbps, 10Gbps etc.). Quality cables clearly state specifications, while cheaper options may use vague terms like 'high-speed'. Thunderbolt cables command premium prices but guarantee 40Gbps performance and features like video output. Matching cable capabilities to your devices' requirements ensures optimal performance. ## Future Compatibility While USB standards continue evolving, backward compatibility is maintained. Older devices work in newer ports but require matching standards for full performance. For example, a USB 2.0 device in a USB4 port will operate at 480Mbps. What began as a universal connectivity dream has grown into a complex but powerful ecosystem, with USB-C emerging as the unifying physical connector for future-proof systems. ## Sources covering this story - https://www.engadget.com/2234239/what-usb-trident-symbol-for-how-to-know-port-type/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._