Before someone asked me what chip is MIFON X1? I read the product description, tri-band total rate AX6600M (573+1201+4804), with 2.5GbE network port, CPU quad-core 1.8GHz, I immediately thought is not the BCM6755+BCM43684+BCM4908, BCM4908 is quad-core 1.8GHz. BCM4908+BCM6755+BCM43684, this combination is strange, how to use two CPUs on one router. The BCM4908+BCM6755+BCM43684, this combination is strange, how a router with 2 CPUs, is I think too much? In order to find the answer, I ordered one and came back to dismantle it to see what I mean.
The outer packaging.
Open again and again.
And then again and again open, finally see the fuselage, a bit like a UFO.
Take out the body and all accessories:
The MIFON X1 looks a bit like the Netgear RAX80, RAX120, TP WDR8600. there are two feet at the bottom of the body, propping up the body and helping to dissipate heat at the bottom, in fact the heatsink is down.
The network cable is very thick, a closer look at CAT6, Category 6 network cable.
The power supply is also very large, and the output specification is 12V/3A, Mosaic power supply, very good. The standby power of the wireless router is 11.9W, 11.1W after turning off the LED light bar in front of the body.
The front of the fuselage is as follows.
Fuselage upside down.
The interface on the back of the body, there is an orange Game port, three ordinary LAN ports, these four are gigabit ports, a WAN port speed is 2.5Gbps. there are actually two USB3.0 ports. The rightmost is the LED switch on the fuselage.
The top of the unit has a display that shows the download rate, the number of connected devices online, and the game port on/off.
The display is shown below. It would be rich if the number of connections for each band was also shown.
Now open, there are four soft rubber plugs at the bottom of the fuselage, pry out with force, there are screws underneath, relatively deep:
After removing the four screws, it is customary to find the location near the mesh and start prying it open. There are a lot of jaws, but also relatively tight.
Disassembled into two parts: the upper and lower.
The lower half has four pieces of thermally conductive silicone that are connected to the heat sink on the motherboard.
The following figure shows the aluminum sheet in the red circle.
The motherboard is in the upper half of the body.
There is a large heatsink on top of the motherboard, not one, but two, with a slit in the middle.
The side of the motherboard, see a large capacitor, not many routers removed, the first time I saw 25V 2200μF, 2200μF ah. I guess it is for the power supply of the display above the body.
There is also a black capacitor 25V 470μF. There is a row of wire plugs that are connected to the display. Dial it and all the antenna plugs, ready to take out the let board. Antenna are hidden in the fuselage on both sides of the “wings” within the PCB antenna, the antenna is not removed, the main look at the motherboard.
Two USB 3.0 ports, no shielding done.
2G-0, 2G-1, 2G-2. do, re, mi, one, two, three, not like the BCM6755 ah. From the circuit the wireless chip is supported 3x3mimo, but only 2x2mimo is used.
Hurry up and take apart to see what’s going on.
This is the upper part of the fuselage.
The middle piece of display, not removed.
The three-piece set is as follows.
The main character comes out, the front of the motherboard.
Back of the motherboard.
See another capacitor, but can not see the parameters, there is a fixed adhesive, slowly pick open, let it stand up, see 16V 1000μF, I guess for the front of the body of the LED light bar power supply.
There is a shield on the back of the motherboard, lift it, there is no chip inside, there is a dense chip capacitors , this location is estimated to be under the CPU, for the CPU circuit to do shielding.
Turn over the front of the motherboard, unscrew all the screws on the heatsink and prepare to rip off the two heatsinks.
Two heat sinks separated from the motherboard.
Between the shield and the heat sink there is a large pad of thermally conductive silicone, a lot of adhesive force, so the word “rip” is used in front.
The central position of the motherboard has a flash memory chip, model MX30LF4G18AC-TI, capacity 512MB.
Below the 2.5G network port, there is a network chip, model BCM54991E, Broadcom 2.5G network chip.
After half an hour of effort to finally disassemble the four pieces of shielding:
The shield is thicker, so it is difficult to pry open, but also worried about the loss of the board at the point of impact.
The upper left corner is the CPU and memory, both have heat-conductive silicone pads, the remaining three are wireless chips, the wireless chips have heat-conductive silicone pads. no heat-conductive silicone pads on the FEM chips.
This angle is more beautiful to look down on.
Let’s start with the CPU, model BCM4908, quad-core 1.8GHz, and the previously mentioned 2.5G network chip BCM49914E connected with the “SGMII+” interface bus, the bandwidth of SGMII+ is twice that of SGMII, that is, 2.5Gbps.
Simple parameters of BCM4908.
Low power quad core B53, 64-bit ARM @ 1.8 GHz
1MB shared L2 cache w/ ECC
IPSEC Crypto support
3x PCIe Gen2, USB3, SATA3
2.5G-phy support (SGMII+)
5 Integrated GE PHYs and switch
A 5-port gigabit switching chip is also integrated.
The memory model is…. Magnesium memory particles, to check the code D9SHD on the silkscreen first, we learned that the model number is MT41K256M16TW-107:P, DDR3L 512MB, two composed of 1GB RAM.
Look at the 4x4mimo 5G chip, the model is only BCM43684, 4x4mimo, support 160MHz bandwidth, the highest wireless rate of 4804Mbps. external four independent FEM chip, the model is SKY85743-21, as long as the silk screen on the chip did not write 85743-11, I think it is SKY85743-21, I do not know if I I don’t know if I’m wrong. From the experience of dismantling the machine is like this. If there is a mistake, welcome to leave a comment below to correct.
The right side of the FEM chip is a dielectric filter, tri-band must, to prevent two 5G interference with each other. Look at the number above is 694F, representing the high band 5G, then BCM43684 work on 5G2.
The parameters of SKY85743-21 are as follows.
Integrated high-performance 5 GHz PA, LNA with bypass, and T/R switch
Fully matched input and output
Integrated logarithmic power detector and directional coupler
Transmit gain: 32 dB typical
Supports 802.11ax: output power:
+21 dBm, -43 dB DEVM, MCS11
+22 dBm, -40 dB DEVM, MCS11
+24 dBm, -35 dB DEVM, MCS9
Conformally shielded part
Integrated, temperature-compensated log detector
Highly sensitive, jammer-tolerant (> +10 dBm IIP3),high gain (16 dB) LNA
Small (24-pin, 3 x 5 mm) conformally shielded package (MSL3, 260 C per JEDEC J-STD-020)
Power amplification parameters in Wi-Fi 6 mode: +21 dBm, -43 dB DEVM, MCS11
This looks like a lot of power, usually I like to separate the power at 160Mhz bandwidth and the power at 80MHz bandwidth in the parameters, and the power in these 2 states is related by 2 dBm, further information.
The result is that the amplification power is +19 dBm at 160 MHz bandwidth and +21 dBm at 80 MHz bandwidth. SKY85743-21 is a high power amplifier.
Popular knowledge: look at the left side of the figure below, a total of 8 RF circuits are led, of which 4 are responsible for transmitting and 4 for receiving, so it is 4T4R, each group of 1T1R consists of a spatial flow, 1x1mimio, 4 is 4x4mimo.
Look at another 5G chip, why do you think it must be a 5G chip? Because there is a filter ah. The number shown on the filter is 235F, representing the low frequency 5G, representing 5G1, the wireless chip model is BCM6710. not BCM6755, is BCM6710.
BCM6710 is the first time I’ve seen the Asus AX86U with a 2.4G wireless chip is also using BCM6710. yes BCM6710 can be 2.4G or 5G. introduction.
The BCM6710 is a 3×3 IEEE 802.11ax Wi-Fi 6 MAP/PHY/Radio system-on-a-chip (SoC) device. The device can operate in 2.4 GHz, 5 GHz and 6 GHz bands selectively. Taking advantage of multiuser technologies such as downlink and uplink OFDMA, the BCM6710 delivers better throughput and reach to consumer devices in a home network.
BCM6710 supports 3x3mimo, while this MIFON X1 only uses 2x2mimo, the highest rate of 1201Mbps. external two independent amplifier chip, the same model as the BCM43684 used: SKY85743-21.
Then, the 2.4G chip will also be BCM6710, also designed only two-way RF, 2x2mimio, the highest rate of 573Mbps, provided that your phone to support 40MHz WIFI6 will have such a rate, such as Xiaomi 10, Apple 11 words is 286Mbps. external independent amplifier chip, the model is SKY85337-11. Integrated PA, LNA and transceiver switch.
The parameters of SKY85337-11 are as follows.
Integrated high-performance 2.4 GHz PA, harmonic filter, LNAwith bypass, and T/R switch
Fully matched input and output
LNA with integrated bypass mode
High-performance SPDT switch to support Wi-Fi functions
Integrated positive slope power detector
Transmit gain: 33 dB
Receive gain: 14 dB
Small 16-pin, 3 x 3 mm laminate package(MSL3, 260 °C per JEDEC J-STD-020)
Output power in Wi-Fi 6 mode: MCS11, HT20-HT40, -43 dB DEVM +21dBm, which is medium-high power.
At this point, the MIFON X1 teardown is complete.
All of the individual chips are summarized in a larger image as follows.
MIFON X1 uses two BCM6710 responsible for 2x2mimo 2.4G and 5G1, a bit of a surprise. 5G all with a high power FEM chip: SKY8573-21, is also under the cost. Affordable price of more than a hundred dollars.
The same tri-band AX6600M ASUS AX6600, which uses BCM6755 for 2.4G and 5G1.
MIFON X1 can be seen as ASUS X86U complementary more than one BCM6710.
MIFON X1 2.5G network port can only be used as WAN port, can not automatically switch WAN / LAN.
The BCM43684, which supports 160MHz bandwidth, is used for 5G2 high-frequency channels and requires 100 channels to be set up for 160MHz bandwidth, which leads to some phones not seeing 5G2.
5G2 is used as a dedicated game acceleration channel, and the orange network port is also for game acceleration, so this is called a gaming route.
Need game acceleration service, to purchase additional related services. The advantage of the router using game acceleration services is that one copy of the matter, multiple shared use.
The three frequencies would have been suitable for users who play games, one of which is dedicated to 5G gaming.