How to change the WiFi channel of the Telecom optical modem? It lags as soon as night falls. Don't just restart—first pin 2.4GB to 1/6/11

cousin's broadband was a China Telecom fiber modem provided by China Telecom. To save trouble, he didn't connect to his own router. The ChinaNet WiFi that came with the fiber modem was used for two years. A while ago, he complained to me that watching videos during the day was fine, but after 8 p.m. he started spinning in circles, his speed dropping from over 100 Mbps to 30 or 40 Mbps. He almost called 10,000 Mbps. I installed an app on his phone to check channels, and as soon as I scan, I understood: his fiber modem 2.4G automatically selects channel 11, and with about ten WiFi devices upstairs and downstairs, five or six are all crowded into channel 11. This issue has nothing to do with overdue payments or aging modems—it's just that the lane is congested.

First, figure out which WiFi your phone is connected to, and don't change it to the wrong location

confirm this before you start, you can avoid many detours. The optical modem provided by operators will broadcast a WiFi device itself, usually starting with ChinaNet-; The router you install later will broadcast a different name. Many people can't figure out which link their phone to, and after searching the optical modem in the background for a long time, they end up using a router every day.

your Android phone, open the details of the current WiFi and look for the "Gateway" or "Router" section. If it says 192.168.2.1, it means you are connected to the telecom optical modem (ONT) itself; if it says 192.168.31.1 or 192.168.1.1, that's the router. The channel needs to be changed in the router's backend. If the iPhone isn't that straightforward, just remember a simple trick: WiFi names start with ChinaNet, or if you see the same name on the optical modem back sticker, then it's basically optical modem WiFi.

if you have your own router at home and the optical modem WiFi is just an unused backup signal, then you actually don't need to read this article. Or go to the router's backend to modify it, WiFi channel interference article have general steps; Or you can conveniently turn off the optical modem WiFi to avoid competing with the router for signal every day. The method is written in the on how to turn off the optical modem WiFi at Telecom. Only those who actually use the ChinaNet signal will continue to watch.

access to the 192.168.2.1 backend, a regular account is sufficient

change the optical modem to WiFi channel, you don't need a super password; just use the regular useradmin account on the sticker. Open 192.168.2.1 in your browser, log in, and then find WLAN or the "Wireless Settings" section. The English word for channel is 'channel'. Some firmware localizes it to 'wireless channel'; if you recognize these two terms, you won't get lost.

the menu levels differ quite a bit between different optical modems. I've helped someone modify four of them and laid out the path:

if you can't find it, first check the backend menu map 192.168.2.1 and make sure to make sure the "Status, Network, Management" sections are clear, then come back and make your name accordingly. The menu isn't a hassle; the real worry is not knowing which function to belong to.

2. 4G isn't available for all 13 options; the only ones that truly don't compete are 1, 6, and 11

this is the easiest place to get confused. 2. 4G channels range from 1 to 13, which looks like a lot of choices, but each channel actually overlaps with adjacent channels. You pick 3, the neighbor picks 1 and 6, both sides get a bit of a dip, and no one can clearly say who is betting on whom. The only ones that truly don't interfere with each other are 1, 6, and 11. Imagine them as three separate lanes, while the other numbers are ridden between the two lanes.

so don't be blind to novelty when you believe in the Dao, and it's best not to believe in 'automatic' either. The original intention of the automatic mode is to let the optical modem find an empty spot on its own, but the home optical modem's automatic algorithm is quite rough; when there are many neighbors, it often gathers together. My cousin's car automatically chose 11, but the whole building was on 11. Manually nailing the emptiest one among 1, 6, and 11 is more hassle-free than automatic.

scan with your phone before changing for the most accurate results. For Android apps like WiFi Analyzer that check channels, find the 2.4G screen and check which of the three positions 1, 6, or 11 has a shorter waveform or fewer neighbors, and select it. After selecting Save, the wireless modem will restart for about ten seconds, and you just need to reconnect your phone.

here's another parameter to glimpse: 2.4G bandwidth. When neighbors are crowded, prioritize setting 20MHz for stable single-lane lanes, while 40MHz is faster but more likely to be squeezed by neighbors. 5G doesn't require much worry; there are many channels and poor wall penetration, so neighbors aren't as competitive as with 2.4G. 2. Whether to separate 4G and 5G, and how to reunite smart devices, I wrote a complete process in the setting up 2.4G and 5G for the Tianyi Gateway. If you want to do this together, you can check out that article first.

after upgrading to the optical modem WiFi, let's wrap up with these three items first

first, avoid the 12 and 13 numbers in the 2.4G channel; don't think that a big number makes you faster. Older phones, cameras, smart locks, and printers only recognize 1 to 11. If you choose 12 or 13, they might not find WiFi at all. My cousin's Xiaomi camera couldn't connect at all after changing the channel to 13, so I just switched back to 6.

second thing: don't expect a lifelong bond just once. Which new router in the building or neighbor changes the channel will change at night? My habit is to take it out and scan every one or two months, around eight or nine in the evening. If you find your own channel is clustered with neighbors, just go in and switch to another empty one, and that's it—two minutes.

third, don't replace the channel change with the "power supply for unplugging the modem." Occasionally, disconnecting and restarting can clear cache, but frequent power outages are bad for the laser, and after restarting, it might automatically use algorithms to reselect the blocked channel, leaving the root cause unaddressed. Once the channel is changed, next time you won't have to worry about it every day.

what situation should you avoid wasting time on the optical modem

Optical modem's built-in WiFi is basically a free gift—four small storefronts, enough but with a low ceiling. If you have dozens of smart devices at home or can't find 5G just outside two walls, then switching channels won't fix it—it's time to install a proper router. After connecting the router, turn off the fiber modem and WiFi, and the whole family can connect to the router, solving both evening rush and distance issues.

there are two other types of cards that aren't about the channel, so don't blame them entirely. One is slow both day and night, even wired computers are slow. First, check for light degradation and wired speed, and focus on troubleshooting the optical modem; The other is a device with only an IPTV card, set-top box with black screens and pixelated pixels. That's a matter of the IPTV private network, unrelated to the WiFi channel. First, clarify today's symptoms; don't set up a single channel to rigidly cover all diseases.

Taking the Role: Finish Five Steps and Finish the Job

order is simple: first confirm who is connected, then go backend, scan and pick the emptiest one from 1/6/11, save it, and retest during the evening rush hour. The night my cousin finished modifying his home, I saw on his phone that the waveform of channel 6 had dropped significantly, the video progress bar no longer spun, and his first words were, "Is it really that simple?" "Yes, many WiFi issues are this simple. The problem is no one tells you which line to look at.