和目 CMIOT-AX18拆机

The cheapest Qualcomm WiFi6 router so far: CMIOT-AX18 disassembly

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The box has the logo of China Mobile, because this product is China Mobile’s own, right?

和目 CMIOT-AX18拆机

Brand new machine, fully packed with accessories, with super category 5 network cable.

和目 CMIOT-AX18拆机

Power output specification: 12V/1A.

和目 CMIOT-AX18拆机

The sleek lines of the body.

和目 CMIOT-AX18拆机

Four Gigabit ports and a physical button for one-touch mesh networking on the far right.

和目 CMIOT-AX18拆机

There are tiny heat sink holes on both sides, which are not very useful.

和目 CMIOT-AX18拆机

Bottom label, device model: CMIOT-AX18

和目 CMIOT-AX18拆机

Unpacking the housing.和目 CMIOT-AX18拆机

Saw a piece of aluminum cooling plate on the motherboard.

和目CMIOT-AX18拆机

This is definitely hand-welded.

和目 CMIOT-AX18拆机

Back of the motherboard.

和目CMIOT-AX18拆机No major chips on the back, there is no heatsink, but covered with tin dots to help dissipate heat, the tin dots partially enlarged:

和目CMIOT-AX18拆机

Back to the front of the motherboard, remove the cooling aluminum plate, there are four pieces of thermal conductivity silicone spacers:

和目CMIOT-AX18拆机

First look at the CPU, the model is Qualcomm’s IP6000, quad-core 1.2GHz, A53 architecture (quad-core Arm Cortex-A53 processor @ 1.2GHz processor), integrated with a single-core 1.5G NPU (network acceleration engine).

It has a magnesium memory chip on the left, model MT41J128M16JT-107:K, with 256MB capacity.

On the left is a flash memory chip, model number F59D1G81MB, with 128MB capacity.

和目CMIOT-AX18拆机

 

The CPU has a QCA8075 on top, which is a five-port Gigabit PHY chip. Connected to the IPQ6000 via SGMII (2.5Gbps bandwidth), there will be no bottleneck of gigabit rate.

QCA8075

The two wireless chips are QCN5052 and QCN5021.

QCN5052 is a 5G wireless chip with 2x2mimo, 80MHz bandwidth and a maximum rate of 1201Mbps in WiFi6 mode.

QCN5051 is a 2.4G wireless chip with 2x2mimo, 40MHz bandwidth and a maximum rate of 574Mbps in WiFi6 mode.

和目CMIOT-AX18拆机

QCN5051 first time I saw, Redmi AX5, Xiaomi AX1800 these are QCN5022.

QCN5051 really has this model, I also paid to download a QCN5051 DATA SHEET.

The QCN5021 integrates a low noise amplifier (LNA) and power amplifier (PA) and supports
20/40 MHz 802.11ax/ac/b/g/n. It is a 28 nm band-specific WLAN AP radio frequency-integrated
circuit (RFIC) supporting 2 x 2/2-SS, UL/DL single-user and multiple-user multiple input
multiple output (MU-MIMO), and UL/DL Orthogonal Frequency Division Multiple Access
(OFDMA).
The maximum RF channel bandwidth per chain is 40 MHz.
The QCN5021 is a 2 x 2 RF companion chip to the IPQ60x8 SoC, which connects through two
I/Q interface pairs to the Wi-Fi BB in IPQ60x8, where the data converters lie. The QCN5021 has
an integrated LNA and PA for each chain. The QCN5021 provides the LNA_EN and PA_EN
digital signals necessary to control the Tx/Rx switch. The WLAN baseband digital (BBD),
ADC/DAC, and BB-PLL are all on the IPQ60x8.

 

QCN5021 functional block diagram:QCN5021 01

I wonder where the differences between QCN5021 and QCN5022 lie. From the picture above, QCN5021 is QCN5022 with integrated PA.

This China Mobile CMIOT-AX18 has no external independent FEM chip for 2.4G, only the QCN5021 built-in PA and LNA.

The 5G chip has an external FEM chip with 4555B silkscreened on it, the model number should be QPF4555B, but the model number is not found on the QORVO website, and there is no information on the whole network.

QPF4555B

Measured the size of the chip: 3x3mm.

和目CMIOT-AX18拆机

Then use a multimeter to find out all the pins of ground (GND) and come up with pins 3, 6, 7, 13, 15 and 16 are GND.

和目CMIOT-AX18拆机

According to the previous two conditions, the similar chip is QPF4506.

QPF4506

The parameters of QPF4506 are as follows.

5150 – 5925MHz
POUT = +15 dBm MCS11 HE160 -43 dB Dynamic EVM
POUT = +21 dBm MCS9 VHT80 -35 dB Dynamic EVM
POUT = +23 dBm MCS7 HT40 -30 dB Dynamic EVM
POUT = +25 dBm MCS0 HT20 Spectral Mask Compliance
Optimized for +5 V Operation
30 dB Tx Gain
1.7 dB Noise Figure
13.5 dB Rx Gain & 6.5 dB Bypass Loss
28 dB 2.4 GHz Rejection on Rx Path
Integrated Logarithmic DC Power Detecto

The amplification power of +21dBm in wifi5 mode and 80MHz bandwidth.

In wifi6 mode and 160MHz bandwidth placed at power +15dBm, this router’s 5G only supports 80MHz, so the power will be a little higher than this parameter.

This motherboard is not found on the CPU power management chip.

At this point, this China Mobile’s CMIOT-AX18 router disassembly is complete. The summary chart of all chip models is as follows.

和目 CMIOT-AX18拆机

The memory of Qualcomm AX1800 wireless will not be bad. Take the Xiaomi 4C rushed down to the first floor D point location, speed measurement as follows.

speedtest

About 40 Mbps, too bad, it is rare to see such a poor speed, is not the size of my measurement and measurement of pins with a multimeter when the FEM chip is bad?

Immediately replaced with a second unit without disassembling the machine, set 44 channels and 80MHz, the measured speed is still more than 40Mbps, not normal ah.

I saw that there is a region selection setting, may be the region is limited, set a U.S. region, and then measured, still more than 40 Mbps

CMIOT 地区设置01

Is the power in the low channel is low ah, change to high frequency channel 161 it, and then measured the speed. God, no change ah 。。。。。。。。 Disappointed to the extreme

Finally, I took the Xiaomi 10, and the band test was only 70Mbps, alas, not normal, very slow. Very bad. The 5G quality of this CMIOT-AX18 is not generally poor. The close distance is no problem, a meter away from the speed measurement 300 megabit telecom broadband can have more than 340Mbps, is a long distance D point position under the performance is very poor.

From the hardware, it can not be so bad ah, want to go online to update the firmware to see, but there is no online upgrade function, and did not find the official website can download the firmware to upgrade.

Summary.

20 dollars to buy this one hardware is quite worth it, but to buy this wireless quality is not worth it.

Support mesh function, the signal is not enough, the number to come together, but also can be used.

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