preface
Not long ago, the charging head network evaluated two chargers from Huawei, 65W and 25W, both equipped with a strange 3.3A data cable. It seems that its wire diameter is no different from the conventional 3A line, as to why this specification is used, the author speculates that it may be related to the proprietary protocol used by Huawei, and the 3A cannot meet the current requirements. So what will happen if you don't use this data cable, what is special about it, and the following will analyze its performance in detail for everyone.
Product Introduction
The data cable body is no different from similar products.
The terminal head and tail of the data line are integrally molded and molded, and the treatment is smooth and burr-free, and the workmanship of the large factory is still blameless.
The word 3.3A on the tail of the line is probably the biggest highlight of this data cable, which does not have a built-in E-Marker chip.
The length of the data cable is about 180.5cm, which is quite enough, and it is also very suitable for charging the notebook.
Wire testing
For the evaluation of the performance of the wire, there are no more than three kinds, whether it can be charged, whether it can transmit data, and whether it can transmit video signals. A little more advanced is whether to support fast charging, fast charging of transmitted data, bandwidth of transmitting video signals, etc. Let's test the data line attached to Huawei's 65W charger.
Fast charging
Here the Huawei 65W charger is used with the Huawei 3.3A C2C fast charging cable to charge the MacBook Pro 16 2021, the power is 19.74V 3.23A 63.88W, and the charging current has reached the transmission limit of the cable.
Try another charger, in the same scenario, the charger is replaced by a flash pole 140W gallium nitride charger, the charger outputs 20V voltage, the current is 2.96A, the power is 60.27W, and the upper limit of the current that the wire can carry has also been reached.
For the charging treasure that supports 100 watt input, the power is 20.31V 2.88A 58.56W.
Charge the 2019 MacBook Pro 16 with 20.31V 2.87A 58.34W.
brief summary
As a fast charging cable as standard for Huawei's 65W charger, this cable supports 3.3A transmission current, which can meet the output power of Huawei charger 20V3.25A 65W, and can also achieve a power output of about 60W with other high-power PD chargers.
Data transmission
Let's take a look at whether the cable supports data transmission, connect the cable to the hard disk box of the laptop and the internal hard disk, and the hard disk has been successfully read on the computer side.
In terms of speed, the measured write speed using the Disk Speed Test is about 36.6MB/s and the read speed is about 36.9MB/s. This speed is in line with the USB 2.0 data transfer standard, daily transfer of small files is still enough, if the transfer of large files is a bit stretched.
brief summary
About 36MB/s transfer speed, for daily transfer of small files is almost enough, after all, it can also let you transfer data, can not find other lines, take the temporary transfer of data should be an emergency or can.
Video expansion
In fact, this test module has probably guessed the test results before the actual test, and the 3.3A C2C fast charging line of Huawei does not support video transmission, after all, as a standard cable, it can be charged quickly and can transmit data.
Charging head net summary
In the actual test, this data cable data transmission is decent, after all, usb 2.0 specifications, thirty or forty megabits per second is basically enough, as for video transmission, don't think about it; and the charging power part has some small surprises, and predicted, it is prepared for the 20V3.25A this gear, the charging power up to about 63.8W, fully squeeze the potential of the charger, and as far as possible to reduce the cost, more than one watt waste, less than one watt of crime, positioning is quite accurate.