Why does the Telecom optical modem keep disconnecting from the internet? I kept a monthly outage schedule, and four categories of patterns were assigned accordingly

Last September, my broadband had a flare-up, disconnecting three or four times a day, each time just a minute or two before I could get back to life. I called 10,000 to request repair, the technician came twice to the door, and the network was fine. The light decay and speed tests were normal, and after finishing, he just said 'observe and observe' and left. The third time, I didn't rush to call, but I dug out an old notebook and made a note each time it was disconnected: what time, how long it was off, what light the optical modem was on, and who was using the internet at home. After a full month of memorization, I opened the notebook and found that the internet disconnection had a routine—two sets of patterns were clear, and by following the patterns, I checked them one by one, and within a week, the root of the problem was suppressed. This article will explain the method of "keeping time records."

Step 1: Spend the whole night figuring out which layer is broken

many people talk about "internet disconnection," they are actually not the same thing. Before you start recording, spend the night separating three key issues: WiFi disconnection, broadband disconnection, and single-device disconnection.

only three movements to judge. When it was disconnected, I checked whether the WiFi icon was still there. The icon was gone, which was a wireless issue, a dispute between the router and the optical modem; If the icon turns in the bottom right corner and can't access the internet, then the broadband cable is broken. Looking at the light modem's light, LOS flashing red means the light path is faulty. I wrote an article comparing light signals, LOS the red light and PON light face each other , you can tell if the light modem is dead or dead in five minutes. Third, ask your family: Is it the whole family that disconnects at once, or is it just his device? If only one device is disconnected, it's usually a problem with the device itself. For example, the phone's WiFi module is faulty. I've written about troubleshooting ideas before, but WiFi the full bars but can't get online half of the time is about it.

after layering, start recording the broadband layer. This is what my form looks like:

can't remember the color of the light, that's okay; write 'didn't notice' truthfully, and by the second week, you'll start watching the light yourself. When this watch is written all around, the pattern will naturally emerge.

Pattern 1: Interruptions from midnight to early morning are probably due to configuration push

those records from after 2 a.m. in my watch, just cut off for a minute and you're fine, and the next day you'll have no issues online—this is the least worry-free. Telecom's ITMS platform is used to uniformly issuing configurations and firmware rolls between 2 and 5 a.m., and during the process, the optical modem needs to restart some services, which can result in flash outages lasting just a few minutes. I suffered a big loss before: the bridge I had modified overnight was reverted back to routing mode. Tracing it back, it was caused by this late-night push. How exactly to prevent it? ITMS the midnight push configuration article was very detailed. If you have a bridge at home, it's worth reading.

it's not hard to confirm. Using the useradmin account on the back of the optical modem to log in to 192.168.2.1, most models have system logs under the "Status" or "Management" menu. If you check the time of disconnection and see records labeled TR-069 or ACS, it means it is running. For some models, you need super permissions to view the menu fully. If you can't see the logs, don't be so stubborn. If you have a minute of flashing in the early morning and a full day of normal during the day, you can basically make a definitive judgment.

By the way, if your home is using a router for dial-up, the router's scheduled restart function can also cause "on-time disconnection." The reset I set for my parents' home was every Wednesday at 4 a.m. My mom used to get up early to go online, complaining that Wednesdays always disconnected. When I checked the time, it was the restart window. How to set up a scheduled restart, how to set up the appropriate frequency settings, the article on router scheduled restarts with route lists for various brands.

Pattern 2: Nothing happens during the day, but at night it must stop, with light decay jumping on the critical line

my second set of rules is striking: all internet disconnections are squeezed into around 9 p.m., and almost no breaks during the day. This is almost certainly a light decay line.

Light decay isn't a cliff-like thing. My Huawei HS8145V5 has a backend lighting power of -26.5dBm, which looks fine during the day, but it's already stuck to the -27 health line. At night, when the temperature drops and the connection fluctuates, the bit error rate rises. The modem starts repeatedly trying to resync, but outside, the WiFi icon is still there, the webpage spins everywhere, and after two minutes it works again. The healthy range is -8 to -27dBm; below -28 degrees, it's weak light, and biting errors and disconnections are common. How to read this number, how to divide into four levels, and what to do about light decay. There is a tiering table in the article just read your own numbers.

three simple self-inspection tips: trace the leather line along to check for dead bends caused by furniture pressure, leaving a bend radius of at least five centimeters; Unplug the fiber optic plug, wipe it with anhydrous alcohol, then plug it back in; When reinserting, I heard a click. I did a full set, and the light degradation dropped from -26.5 to -24.8, and the number of disconnections at night dropped by more than half.

there's another kind of 'night lag' to distinguish: if the line is off, it's slow. If latency spikes during the evening rush hour, it's congestion in the area, not your home's problem. Speed measurement methods are described in broadband speed measurement . Disconnection and slowing down are two different things; don't mix them up for repairs.

Pattern 3: Random disconnections and restarts are best, and the three hardware suspects are listed one by one

the kind of disconnection at three or four in the afternoon when no one is home, then the device doesn't recover after it and insists on unplugging and restarting—that's hardware causing trouble. Three suspects were listed according to the probability of being caught.

number one is overheating. The optical modem never shuts down year-round, and many people stack it with the router to fit it into a weak current box. In summer, the temperature inside the box easily reaches forty to fifty degrees. I tested my own low-voltage box: in September afternoon, the temperature was 45°C, and the modem shell was hot to the touch. High temperatures not only induce crashes but also reduce the lifespan of optical modules—the laser junction temperature remains high for a long time, power drops, and light degradation increases year by year, creating a vicious cycle. Take the optical modem out of the box, place it separately from the router, and avoid stacking it—it's the cheapest solution. How to place equipment in a weak current box, why is it recommended to place the optical modem in a low position? the article on weak current boxes includes Huawei's official . If you really want to relocate it, how do you coil the fiber cable and connect the flange? All the pitfalls I've made are recorded in the article on the modem repositioning .

number two is the power supply. The optical modem's adapter is plugged in for years. After the electrolytic capacitor ages, it reads normally when the load is off, but once the load voltage is off, it collapses. This can happen if the modem restarts at midnight, with all lights turning off and then fully on. I suffered this loss on my router before—measured only 9V, but after switching the head, it healed. the three switches in the power adapter article (same voltage, current only high but not small, polarity correct) also applies to the optical modem. I also replaced the old power strip; the oxidized contacts have poor contact, breaking with each vibration.

number three means the equipment itself is already old. Optical modems can be used for five to six years under heavy load, while consumer modules last five to eight years. After three years, laser power starts to decline. The signal is that light degradation is rising year by year—last year -23, this year -25. With frequent restarts and more frequent restarts, it's better not to fix it. Call 10,000 to report 'Aging modem with major light degradation.' Telecom usually doesn't charge for replacements before warranty expires. The process of firmware and device replacement was mentioned the article on upgrading the modem firmware update. The aging signal on the router's side is actually the same principle. how many years the router can last you can check the five-signal list in that article. Also, don't forget the network cable between the optical modem and router. The connector is oxidized, the internal cable is crushed, and the cutting method is random. The method to locate the cable is what to do if the internal wall cable breaks.

Rule 4: When it breaks, just check the light; LOS and PON won't lie

if the modem light moves during a network outage, things become easier to handle. LOS flashing red means the optical circuit is cut, the leather wire got caught in the door, or there was a problem on the splitter. The only thing I could try was to rewire the wire; if that didn't work, I just called for repair. The technician brought an optical power meter to test in sections. PON flashing means 'registering' and waiting three to five minutes for it to heal on its own, which is normal. If it keeps flashing and you need to call 10,000, it might be that the data center side has blocked your home port. The lights are all green but I just can't get online. Checking for outstanding fees and verification—I listed these in the five-light comparison chart the LOS red light article. If the internet is off, just take a photo to match the numbers.

How to use the

network disconnection record sheet: Stop saying "bad internet" when requesting repairs

"Failing to catch the situation in the right moment" is the most headache-inducing task for maintenance masters. The more detailed you describe, the easier it is for them. My third repair request was like this: Every night from 9:00 PM to 10:00 PM, there were two or three disconnections for one to three minutes, with a backend light reception power of -24.8. On September 12 at 21:47, LOS flashed red once, and at 2:00 AM, it still disconnected. After hearing this, the technician brought a photometer to my home and measured the corridor splitter at my home. He found that the cold joint was oxidized, and after melting the fiber, the light was -21 that night. After a month, it hasn't happened again.

can do this on your phone first: Xiaoyi Butler App one-click detection can locate fault segments and track work order progress inside—better than just waiting for a do. When it comes to making a call, just follow the full process and script template in the section on broadband repair.

Give a self-check order at the end, don't jump around randomly :

• 1. When the internet is off, check the light modem and take a photo to first identify which layer is
• 2. Keep recording the record sheet for two weeks, and mark the time pattern
• 3. If it disconnects right at dawn, check ITMS push notifications and router scheduled reboots—tolerate it if possible
• 4 If it definitely breaks at night, log in to 192.168.2.1 to check for light degradation. When attaching the wire, just straighten the wire, wipe the head, and replug it back into the
• 5. If it breaks randomly, check the temperature, replace the power strip, measure the power supply, and if that's not possible, check the network cable
• 6. Bring the record sheet and light degradation readings to request repairs. To be specific, it's all done in one go

month of solving cases taught me one thing: internet disconnections aren't scary; what's scary is that every time they end, the news just passes, leaving no evidence behind. If your light cat is also having a relapse, start recording the first stroke tonight.