The Type-C end is plugged into Twinkie, acting as a pass through to Chromebook Pixel 2015. Picture attached!
First let's run the ectool command from Pixel's command line to check what Pixel thinks is happening on its USB-C ports : localhost ~ # ectool --name cros_pd usbpdpower Port 0: SNK Charger DCP 4713mV / 2000mA, max 5000mV / 2000mA / 10000mW Port 1: SRC
So far so good. Pixel identifies the charger as a DCP type adapter, and has negotiated 2A 10W of charging.
Let's see what Twinkie (the USB PD sniffer) says : > tw cc CC1 = 16 mV ; CC2 = 418 mV
The tw cc command reads the instantaneous voltage values from the CC pins. As you can see here, CC2_PD pin has a value of 418mV. Referring to the USB Type-C Specification Table 4-25 Voltage on Sink CC pins, this voltage falls right in the middle of the range allowed for vRd-USB, meaning that yes, this USB cable has the correct 56kΩ pullup resistor!
One more command : > tw vbus VBUS = 4741 mV ; -2031 mA
The tw vbus command uses twinkie's current and voltage meter ability. As you can see, the laptop is pulling just around 2A of current at 4.741V from the Dell DCP adapter.
For a USB 2.0 High Speed data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the Tecknet 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 Tecknet cable, and verified that it indeed enumerates at SuperSpeed by viewing the enumeration in dmesg, 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.
Now for more subjective judgments 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.
In conclusion : A high quality charging and data sync A-to-C cable from TeckNet! The cable is a great safe way to charge and sync newer USB Type-C devices such as Nexus 6P/5X or Pixel devices with your old Type-A equipment. It is future proof for fast charging USB Type-C devices to come, as well as future proof for USB 3.1 SuperSpeed devices!