Xiaomi AX9000 tri-band wireless router disassembly

Xiaomi AX9000 tri-band wireless router disassembly

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Good big box, the antenna can not be completely put away so this package.

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Inside the box, a bit like a nuclear weapon remote control launch code suitcase.

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Open the box

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Take out the body and accessories, the physical look of this Xiaomi AX9000, and not as ugly as the effect of the picture, the physical look is OK.

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This larger than the body of the foam box do not throw it, you sell used, how do you want to package it to protect the 4 groups of antennas. Throw away such a large foam, but also not environmentally friendly ah.

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Power output power 12V/4A, it is necessary, three frequency well, and this Xiaomi AX9000 standby power 12.6W. If the tri-band high-speed transmission, is bound to exceed 20W, how much is not clear, no actual measurement! I guess not more than 30W. power supply power reserved for a large number of less heat, the output is more stable.

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The size of Xiaomi AX9000 is really big, the unfolded antenna side length reaches 28.5CM.小米AX9000拆机

The body is heavy, reaching 2KG.

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There are four Gigabit ports and one 2.5Gbps network port (blue).

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There is a USB 3.0 port and MESH button.

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A simple measurement of the USB3.0 port read and write speed can be how much.

Bottom of the fuselage.

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This angle is harder to see.

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The bottom of the feet tear off, the label also tear off, a total of 10 screws, take out the shell can be pried open, see a cooling fan in the center, 6CM fan.

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Does this look like a cannibal flower?

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Heatsinks are also larger in size, increasing the ability to passively dissipate heat, the fan does not often start, to maintain silence, I DIY soft routing is also the idea.

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First disassemble this huge size of the radiator, also remove the fan firmware bracket, the purpose is to measure the weight of this radiator.

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Weighed, a full 500 grams, accounting for a quarter of the weight of the entire body.小米AX9000拆机

After taking off the heatsink you can see the motherboard:

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Antenna housing can also be removed, first look at the antenna it. The three frequencies are 4x4mimo, each group of antennas in the antenna must have three frequencies. As shown in the figure below.

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2.4G antenna next to the high-band 5G antenna, the 5G antenna below is the low-band, which is the so-called gaming-specific 5G that supports 160MHz. according to Xiaomi’s logic, all three bands can be called gaming. But the fact is also true, you connect all the devices at home on the high-frequency channel, you own a cell phone connected to the low-frequency 5G, so that other devices do not affect you when transmitting. This is exactly one of the benefits of tri-band routing, you may ask, I take two dual-band line? Yes, but do not put too close to the distance, the focus is to two 5G set in the low channel and high channel, respectively, the effect is similar to a tri-band.

The two 5G bands in the tri-band wireless router can be said to be 0 distance away, if you do not do any measures, will interfere with each other. It is a good professional look. I do not know if it’s right, not right please propose.

Note that the two 5G antennas, the plane of the PCB antenna is perpendicular to each other, as shown in the following figure.

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Such a design is perhaps one of the physical measures to prevent mutual interference. For the other physical measure, read on.

Taking the motherboard out.

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The bottom of the body is covered with antenna feeder, because the shell size is huge, some of the feeder length is too long, which may lead to signal attenuation, theoretically the shorter the feeder the better. But the volume, there is no way to avoid it. But the alignment is very neat, and the three frequencies are indicated by different colors.

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The red box in the picture below is the AIoT antenna, affixed to the inside of the body, which is a dual-band antenna. Its position is also careful, not closer than 15CM with adjacent 2.4G and not closer than 7CM with 5G.小米AX9000拆机

Turn the motherboard over and look at its bottom, which I define as the back of the motherboard:.

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Can be seen in front of the motherboard also has a large piece of aluminum cooling plate, remove this aluminum plate:

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There are also several metal shields on the back. The yellow area in the red circle in the picture below has dense protruding points that serve to enhance the heat dissipation in the local area of the motherboard.

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The appearance of all shields after they are removed.

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There is no major chip on the back of the entire motherboard, so put the shield and heat sink back on and now concentrate on the front of the motherboard. The shield has thermal silicone gaskets attached to the top, and the gaskets are directly below the location of the main chip.

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The shield are removed, visible below each piece of shielding also has a thermal conductivity pad.

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You may notice that among the three frequencies, only one shield has four small heat-conducting spacers underneath, allowing the FEM chip to enhance heat dissipation. Look at the antenna interface, is 2.4G. above the FEM chip can not just stick something, will affect the effect of FEM.

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So to the back of the FEM chip for heat dissipation. Maybe 2.4G impact less it, two 2 5G FEM chip above and did not stick on the heat sink spacer, is not a jerry-built approach.

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Let’s start by looking at the CPU. The CPU model of Xiaomi AX9000 is Qualcomm IPQ8072A, quad-core 2.2GHz, A53 architecture, 14nm process. Built-in dual-core 1.7GHz NPU, this NPU can reach 2.2Mpps packet forwarding rate. (I haven’t tested it)

There are 2 USXGMII buses (up to 10Gbps bandwidth), which can connect out 2 10GbE ports, if you have money.

If you don’t have enough money, you can turn the USXGMII into a lower rate SGMII+ (maximum bandwidth 2.5Gbps), for example, to connect out 2.5G network ports.

There is 1 PSGMII bus (maximum bandwidth 6.25Gbps), which is usually used to connect to QCA8075 (five-port Gigabit Ethernet PHY).

IPQ8072A

The CPU is next to two memory chips, the model is EM6HE16EWAKG-10H, DDR3L, capacity 512MB, two composed of 1GB. is the largest memory in the history of the Xiaomi route, right?

On the side of the memory is a 5G chip working at low frequency, model QCN9024, Xiaomi AX6000 is also used this newer 5G chip, supports 4x4mimo 160MHz, the highest rate of 4804Mbps, in 2x2mimo support 4096-QAM, so that the maximum rate of Xiaomi 11 can reach 2882Mbps.

QCN9024

The differences between the QCN9074, QCN9024, and QCN6024 5G chips are shown in the table below.

Xiaomi said OFDMA users up to 37, probably another 5G chip supported by the. This QCN9024 supports up to 16 OFDMA user terminals, which is definitely enough for home use.

The external four FEM chip, model QPF4588. xiaomi AX3600 and xiaomi AX6000 are used it.

The parameters of the QPF4588 are as follows.

5150 – 5925 MHz
POUT = +16dBm MCS11 HE80 -47dB Dynamic EVM
POUT = +18dBm MCS11 HE80 -43dB Dynamic EVM
POUT = +23dBm MCS9 VHT80 -35dB Dynamic EVM
POUT = +24dBm MCS7 HT20/40 -30dB Dynamic EVM
POUT = +26dBm MCS0 HT20 Spectral Mask Compliance
Optimized for +5 V Operation
33 dB Tx Gain
2 dB Noise Figure
16 dB Rx Gain & 7 dB Bypass Loss
30 dB 2.4 GHz Rejection on Rx Path
Integrated RF Power Detector Coupler as well as DC Power Detector

Compared to the SKY85747-11 used in the H3C BX54, which is 1dBm lower at -47dB Dynamic EVM, the QPF4588 is also considered high power.

In WiFi5 mode amplification power +23dBm = 200mW, not particularly strong.

The left screen printed with “5235″ is the media filter, a total of four. The two 5G RF circuits of the tri-band wireless router must have filters to prevent two 5G interference with each other, dual-band routers do not need to use it.

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The waveformer has a disadvantage, which is to cause signal attenuation, about 2dB. So the same chip solution of tri-band routing than dual-band 5G signal is weaker, for example, Netgear R8000 generally respond to some weaker signal than the R7000.

If you feel that the signal of Xiaomi AX9000 is somewhat inferior to Xiaomi AX6000 and Xiaomi AX3600, please do not be surprised, this is a reasonable fact, physical loss ah! Unless optimized properly, the PA output increased, but will increase the vector distortion, so that 1024-QAM becomes unstable.

Look at another 5G chip, that is, the chip responsible for high-frequency 5G, the model is QCN5054, supports 4x4mimo 80MHz or 2 × 2 160MHz, but in the 149-161 frequency channel, can only support 80MHz.

The external FEM chip is also QPF4588, which will not be repeated.

Printed with “5697” is the dielectric filter, also said earlier, not repeated.

QCN5054

2.4G wireless chip model is QCN5024, support 4x4mimo 40MHz, the highest rate of 1157Mbps, the highest cell phone 2x2mmo, so the cell phone 2.4G rate of up to 573.52Mbps, if the phone only supports the highest 20MHz, the highest rate is cut in half to 286.76Mbps, if there is a large interference in the environment The 2.4G transmission speed is only a few tens of megabytes, or even lower. This is the reason why I urge people to use 5G if they can use 5G.

QCN5024

The 2.4G FEM chip model is QPF4288, which is also the model often used by Xiaomi.

The parameters of QPF4288 are as follows.

2400-2500 MHz
POUT = +17 dBm HE40 -47dB Dynamic EVM
POUT = +22 dBm HE40 -43dB Dynamic EVM
POUT = +24.5 dBm MCS9 HT40 -35dB Dynamic EVM
POUT = +26 dBm MCS7 HT20/40 -30dB Dynamic EVM
POUT = +28 dBm MCS0 HT20 Spectral Mask Compliance
Optimized for +5 V Operation
33 dB Tx Gain
1.7 dB Noise Figure
15.5 dB Rx Gain & 7 dB Bypass Loss
>10dB 5 GHz Rejection on Rx Path
Integrated RF Power Detector Coupler as well as DC Power Detector

The power is considered high.

There is also a fourth wireless chip, responsible for automatic access to smart devices and synchronization of information, other brands of smart products are not compatible.

The model of this chip is QCA9889, supports 1x1mimo and 802.11ac, so 2.4G maximum rate of 150Mbps, 5G is a high speed rate of 433Mbps. QCA9889 is not only dedicated to AIoT, but also responsible for turning the AX8400 into AX9000, which is credited with the surface parameters, without which there would be no AX9000 and AX6000 and AX3600, without it it will become AX8400, AX5400, AX3000.

It can indeed facilitate your newly purchased Mijia smart devices, even if your family does not know how to operate, you can also use the APP to remotely help your family to operate to join the Mijia APP.

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Now comes the network interface circuit part, the IPQ8072A is connected to this QCA8075 (five-port PHY chip) through the PSGMII interface, so the network port is not like the Xiaomi AX6000 which only has 1G shared bandwidth. Xiaomi AX9000 like Xiaomi AX3600 doesn’t need to worry about this bottleneck!

IPQ8072A connects to the 2.5G PHY chip via SGMII+, model QCA8081, which is also used in Xiaomi AX6000. It can do WAN or LAN, either one, it is up to the user to decide.

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Gave you a 2.5G port, but also some people complain about less, there should be at least 2 2.5G port to good. This is not unreasonable, but this is only $ 150 ah.

Also, there is a flash memory chip near the memory, the model is W29N02GZSIBA, capacity 256MB.

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Advanced power management chip, Qualcomm PMP8074 (PMIC), manages the power supply to the CPU.

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The fan power supply is a four-wire, interface specifications are 1.25mm 4P, I do not know whether it is PH or SH. the top left corner of the picture below is a chip responsible for fan speed control, can also be seen as a fan power management chip it.

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USB3.0 interface shielding measures, an EMI shielding tape, formerly common on some models of network devices. Working in USB3.0 mode will generate a frequency of 2.4GHz, the external diffusion will affect the 2.4G WiFi and Bluetooth, so the interface location to be shielded.

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Finally, a summary chart of chip models.

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By this point, Xiaomi AX9000 disassembly into.

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I was most interested in knowing how much read and write speed it could have with its USB 3.0 interface, led by a quad-core 2.2GHz. So I took out the high priced M2 mobile hard drive case and plugged in the SM961 256GB ssd. One computer with an AQC107 network card was connected to the 2.5G LAN port of the Xiaomi AX9000 and directly copied a single large file using fastcopy software at the following speeds.

小米AX9000USB3.0速度

Read speed 103.9MB / s, write speed 43MB / s, this speed and I expected a big contrast, a little disappointed!

This is the first Xiaomi WiFi6 wireless router with USB interface, and the CPU is IPQ8072A, the frequency 2.2GHz ah, you give me the write speed is only the level of Netgear R7000 ah?

The same IPQ8072A MX5300, although only a gigabit port, but also 111MB / s write speed ah, a lower frequency IPQ8174 (quad-core 1.4GHz), MX4200, write speed also has 111MB / s.

Read speed is also unsatisfactory, read and write are not as good as the Asus AX86U and XDR6060.

Finally, the router put upstairs, in the downstairs D point location speed test, take Xiaomi 4C, Xiaomi 10, Xiaomi 11 the three cell phones for speed test to see, broadband 300 megabytes. The three frequencies were connected to speed test three times!  This is just a teardown article, not a review article, so this is just to teardown the winding down.

Point D is a medium to long distance, the speed measurement results are as follows.

测速

From the Xiaomi 4C speed measurement, 5G game band, that is, the low channel 44, measured speed of about 220, which is equivalent to the level of the Redmi AC2100, a little slower than the Xiaomi AX6000;

Xiaomi 10 measured speed at about 300, the highest 311, the average value is also a little lower than the Xiaomi AX6000.

Xiaomi 11 measured speed, well. 200, I have said countless times, Xiaomi 11 than Xiaomi 10 WIFI weak, Xiaomi 11 has been replaced by a new machine. Still the same!

2.4G don’t look anymore

Poor performance on high frequency 5G (161 channels). If you find that 5G is not good, you may be connected to exactly this 5G band, it is not recommended that the two 5G names are the same, it is recommended to use them separately, to high speed to be able to low-frequency channel of that 5G, especially in the middle and long distance.

Xiaomi AX9000 does not use 2.4G and 5G together antenna, so that you have to use duplexer, duplexer will also cause signal attenuation, here to avoid, but the two 5G inevitably have to use the media filter, signal attenuation a little, is also normal, the high-frequency part of the attenuation more. There may be 3dB loss.

Xiaomi 4C in D point measurement channel 149 above the 5G, sometimes dropped, usually poor signal will only have this situation , Xiaomi 4C rarely weak to drop, in D point.

 

Summary.

Xiaomi AX9000 is the cheapest model you can buy that uses IPQ8072A, and it’s still tri-band, and gives you 2.5G network port and USB 3.0. $150 for such hardware is not a bad deal. Unless there is a cheaper than Xiaomi appear later! Usually this is very unlikely, if you do not need the U port does not need tri-band, Xiaomi AX6000 on the line, if the 2.5G port also does not need, AX3600 will be able to meet, so you now use the AX3600 and AX6000, to consider the needs clearly before considering AX9000, do not expect AX9000 in the signal brought about by the change, will not!

USB3.0 interface, read and write speed well let me down, optimization issues or cost issues?

The problem of high-frequency 5G is obviously weak and needs to be optimized. But you can not take the high-frequency 5G speed to compare the low-frequency, so unfair, most environments and most models, low-frequency 5G is significantly faster, so I have been using the 44 channel to test, but also recommended that you use 40 and 44 channels to get a better signal quality.

Low frequency 5G I think no problem, a little worse than the Xiaomi AX6000 is reasonable.

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