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Boot Remedy's USB 3.1 A-to-C cable has the correct CC termination! A great legacy SuperSpeed cable for your Type-C devices!
on January 26, 2016
Benson here again, continuing my reviews of USB Type C legacy cables. Today I am reviewing Boot Remedy's "High Quality USB Type C Cable for Nexus 5X, Nexus 6P, Lumia 950, OnePlus 2, Nokia N1 Tablet, Fast Charge USB 3.1 Type C to USB 3.0 Type A Male."
Let's talk about spec compliance. My test setup today include a Chromebook Pixel 2015, and a Chromium OS USB-PD Sniffer (codename Twinkie). Please check it out by searching google for "Chromium USB-PD Sniffer". This product is also available on Amazon here : Plugable USB 3.1 Type-C (USB-C) Power Delivery Sniffer
I got a comment in one of my previous reviews that I should be testing with a 2.4A capable power supply to demonstrate that the cable is of good enough quality to sustain 2.4A charging, so for this review, I am using one of Apple's 1st party power adapters with a 5.2V, 2.4A charging capability, specifically Apple's 12W iPad charger.
Running the ectool command on Pixel:
localhost ~ # ectool --dev 1 usbpdpower
Port 0: SNK Charger Proprietary 4643mV / 2400mA, max 5000mV / 2400mA / 12000mW
Port 1: SRC
In this case, the Pixel has negotiated up to 2.4A of charging through the Boot Remedy cable to the Apple charger.
Switching over to the USB PD sniffer, I'll run the "tw cc" command to get a voltage reading on both CC lines:
> tw cc
CC1 = 17 mV ; CC2 = 419 mV
The important number to look at here is CC2, which indicates a voltage of 419mV. If you refer to the USB Type-C Specification 1.1 Table 4-25.
Look at the row labeled vRd-USB, which indicates the legal voltage values to read from the CC pin in order to be categorized as "Default USB Power". The range is Min : 0.25V Max : 0.61V. For this cable, I measured a value of 0.419V right in the middle of this range, indicating that yes, this cable has a 56k' resistor and is within spec for CC termination.
One more command :
> tw vbus
VBUS = 4701 mV ; -2305 mA
The tw vbus command uses twinkie's current and voltage meter ability. As you can see, the laptop is pulling just around 2.4A of current at 4.701V from the Apple charger.
For a USB 2.0 High Speed data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the Boot Remedy Type-A to Type-C cable to test large file transfer via MTP. It just works, no problem!
For a USB 3.1 SuperSpeed data test, I've hooked up my Pixel C to my Chromebook Pixel using the Boot Remedy cable, and verified that it indeed enumerates at SuperSpeed by examining the device enumeration messages in dmesg (indicating new SuperSpeed USB device), and that large file transfers are stable. This is a great cable to have for MacBook users especially who want to use Target Disk Mode, which requires a SuperSpeed capable USB cable.
For other more subjective judgements of this cable : The Type-C plug on this cable is a stamped metal part that's been wrapped around to the shape of the plug. It does have a seam on one side. The tip of the cable is black plastic, which rounds off the top. Overall, good quality here, but not great.
In conclusion, this is a fine cable for your Nexus 6P/5X to use with all of your older USB Type-A chargers, hubs, and PCs. It also works great with Chromebook Pixel 2015 and will work great on USB Type-C spec compliant devices to come, as well as future proof for USB 3.1 SuperSpeed devices!