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What exactly is the "4 independent FEMs" mentioned in teardown reviews? FEM is the front-end module of the router's wireless transceiver, containing the power amplifier PA for transmitting and the low-noise amplifier LNA for reception, essentially acting as a speaker and ear for signals. Routers with the same chip have a 70MB difference in barrier walls, and the difference is often just these few small chips. This article breaks them down and explains them clearly....

The line in the phone's specs sheet says "supports 802.11 a/b/g/n/ac/ax" isn't garbled text, it's a WiFi genealogy. 802 is the name of the IEEE committee established in February 1980. 11 is the group that manages wireless within the family, with the letters following the generation number. n stands for WiFi 4, ac for WiFi 5, and ax for WiFi 6. The nickname WiFi 6 was only invented in 2018; before that, the whole world called it 802.11ax, but no one remembered it. After reading this, you'll be able to read the string of letters on the router's detail page and the specification sheet....

The mobile WiFi details say -65dBm, the optical modem backend -23dBm, and the router power 20dBm—all in the same unit. Why are they all negative? The difference between -60 and -70 is ten times, not ten? I brought the five points at home into the formula and checked the accounts, even calculating why light decay is -27 and considered healthy....

The living room speed test was 940 Mbps, but by the bedroom it was just over 200 km/h left, and the signal icon had only dropped one bar. After searching for half a night, I finally understood: the grid count is about whether you can hear it, while the internet speed is about whether you can hear clearly. The router and phone secretly switch QAM settings every few tens of milliseconds according to the bit error rate. Every 6dB difference in signal-to-noise ratio requires a step down. The comparison table at the end of the article helps you locate which level your WiFi is stuck in....

My childhood friend upgraded to gigabit broadband, but the speed test was only 400 Mbps. The broadband technician's metering modem was directly connected to 940, so I told him to switch routers. I remotely checked their Mercury backend: it was a parental control set for my son's tablet, but the hardware NAT acceleration was disabled and reverted to the CPU software forwarding. Where are the switches hidden in each brand, and which features fail when the acceleration is turned on? This article explains everything clearly....

Ping isn't a phone call; it's shouting to the other end to hear the echo. I manually pinned all four servers with 32 bytes: 223.5.5.5 replied in 13 milliseconds, 114.114.114.114 all timed out, but its domain resolution still responded instantly. How to reverse the number of hops with TTL, web pages that won't open when ping is working, tracert using TTL to catch routers with hop-hop — this article explains everything with real-world test data....

Router LAN port aggregation and NAS dual network port binding—many people think that bundling two gigabit ports together can run 2G. I tested with a dual-port network card: single-threaded copying was still 110MB/s. Aggregation divides connections rather than bandwidth; multi-device concurrency is advantageous. The pitfalls of the foolproof switch in the middle and how to choose a 2.5G solution — this article explains everything in one go....

On the third day of using BT for protection, WeChat messages at home were still being received, web pages couldn't be opened, and restarting the router immediately revived it, but the next day it happened again at the same time. After checking, it wasn't broadband or WiFi, but the router's NAT session table was filled with connection counts. Three symptom characteristics, two viewing paths, four handling tips—this article clearly calculates the number of connections....

The network ports on the back of the router are divided into WAN and LAN, with one pipe for incoming and one for output. The night I plugged the fiber modem into the router cable, the whole house's WiFi was maxed out but I couldn't get online. This article clearly explains the difference between two mouths, three tips for identifying them, symptoms of inserting the wrong mouth, and how to fix it....

Even if your phone and computer are connected to the same WiFi, you can't find the TV when casting, and you can't find the other party when sending files, yet the internet is all normal—most likely because the router's AP isolation is working. I accidentally opened it once and explained the principle, the locations of each brand's switches, and the troubleshooting sequence in one go....