Have you ever wondered about the secrets hidden within your USB-C cables? Well, prepare to be enlightened! In a world where technology is ever-evolving, it's fascinating to uncover the truth about these seemingly simple accessories.
Today, I want to delve into a remarkable Mac app called WhatCable, which has revolutionized the way we understand our USB-C cables. This app is like a detective, revealing the inner workings of these cables and shedding light on their true capabilities.
Unveiling the Mystery
WhatCable, created by Darryl Morley, is a powerful tool that utilizes the data collected by your Mac's port controller chip. This chip handles USB Power Delivery negotiation, and with WhatCable, you can access this valuable information that Apple typically keeps under wraps.
Morley explains that when you connect a USB-C cable with an e-marker, the port controller sends a message to the cable's chip, receiving crucial details like vendor ID, speed rating, and current capabilities. This data is then stored in the IOKit registry, and WhatCable reads it using Apple's public APIs.
The Power of WhatCable
What sets WhatCable apart is its ability to provide real-time insights into your USB-C connections. It reads not only the e-marker data but also the actual negotiated connection speed and live voltage and current at each port. This means you can see what your cable and device claim to support and what's truly happening during the connection.
For instance, when I tested a Satechi cable with WhatCable, it revealed that the cable could charge at nearly 100 watts, even though it only offered USB 2.0 speeds. This level of detail is impressive and can help you make informed decisions about your cables.
Uncovering Cable Truths
One of the most intriguing aspects of WhatCable is its ability to identify problematic cables. During my tests, I discovered that a beloved cable of mine, the Supercalla with magnetic winding beads, was no longer performing as expected. WhatCable showed that the Mac wasn't treating it as a 10Gbps, 100W cable, indicating that it might be time to retire this old friend.
On the other hand, a recently arrived cable exclusively for 100W charging surprised me. While the company advertised USB 2.0 speeds, WhatCable revealed that its e-marker claimed 10Gbps USB 3 data. However, further testing showed that the cable couldn't deliver on this promise, highlighting the importance of such tools in identifying misleading claims.
A Free and Powerful Solution
What's truly remarkable about WhatCable is that it's free! Morley has ensured that the core functionality will always remain free, although a Pro version is available for those who want additional features like a real-time power monitor.
Unfortunately, due to hardware variations and limited API access, WhatCable is currently Mac-exclusive. Morley mentions that building a Windows version is challenging, and Android and iOS also lack the necessary low-level access. However, he's working on a Linux port, so stay tuned!
Final Thoughts
WhatCable is a game-changer for anyone curious about the capabilities of their USB-C cables. It provides an unprecedented level of insight and can help you make informed decisions about your devices. So, if you're a Mac user, give WhatCable a try and unlock the secrets of your cables!
Personally, I think it's fascinating how a simple app can reveal so much about our everyday technology. It's a reminder that there's always more to discover and understand in the world of tech.
