2000M broadband speed measurement only 943 Mbps? It's not the carrier that scams people—they check every four checkpoints, from the optical modem to the network card

Friday night, Da Liu sent me two screenshots on WeChat: one was the package page for the service hall app, 2000M; One is the wired speed test result, 943 Mbps downstream. It followed with three question marks, plus the sentence, "Isn't this just blatant robbery?"

I witnessed the entire broadband turmoil of the

Liu family. Last year, when he upgraded to Gigabit, the technician came to replace it for free with a Huawei HN8145X6 10G Optical modem. At that time, I even accompanied him the differences between the two generations of ; Mid-year, to connect remotely with the NAS and the Switch at home, he to dig up the optical modem's DMZ and it again. This time, the 199 yuan fusion package was speeding up; paying an extra 20 yuan a month could raise the amount to 2000M. He got it on a whim. On the day of the process, I took the speed test, 943.

plan mentions 2000M, speed testing is still 943

I replied: Don't call the complaint number yet, the number 943 sounds too familiar. The gigabit main gate is this number—after deducting protocol overhead for a 1000M link, the actual take-home cost is around 940. I had already crossed this before when writing about gigabit or hundred-megabit . A 2000M broadband connected to a gigabit port means an eight-lane highway connects to a single-lane toll station, and the vehicles coming out of the exit are still the same.

troublesome thing is that the gigabit port may be hidden in four places: the optical modem's LAN port, the router's WAN port, the router's LAN port, and the computer network card. Of the four checkpoints, one is Gigabit, and your 2000M is right there. Da Liu's computer is a desktop. I told him not to touch anything else and to pass through each checkpoint one by one.

threshold one: Optical modem, PON is 10 Mbps, but the network port is 2.5G

the next day, he called 10,000, which means he upgraded to 2,000M, and asked if he needed to switch to the optical modem. When the technician came to check, the problem was here: his HN8145X6 had a PON port with 10 Mbps and could receive 2000M signals without issue, but the internal network port was a full gigabit version. Someone online has made the same mistake—the optical modem is called a 10-Gigabit modem, with both upstream and downstream gigabit ports, all four LAN ports are gigabit, wired tests show 940, WiFi can run 1,800-900, because wireless doesn't use those gigabit ports at all.

technician replaced it with a new cat with a 2.5G LAN port. Here's one thing you have to keep an eye on: after changing the cat, glance at the screen mark next to the network port on the device, make sure it's marked 2.5G, plug the router's incoming cable into it, and don't casually plug in port 1. Many people get used to plugging in the first port of the network port, but after replacing the cat cable, they plug it back in the original position, which is basically a wasted replacement. Also, the standards for cat replacement in the 2000M range vary by region. Some offer free service, others require a deposit. Before the technician arrived, he called to clarify, and Da Liu didn't charge the money.

switching cats also dealt him a collateral damage: he lost both DMZ and static bindings, so he took the super password and set it again. For those who have struggled with bridge or DMZ systems, switching to a new cat is like restarting your configuration—be mentally prepared. Before leaving, the technician also did the inspection inspection: the PON light stayed on, the light degradation was read down on the weak current box sticker for later comparison—replacing the cat was essentially a reassembly, and all the key components you had to watch during assembly couldn't be skipped.

Threshold 2: Network cables, no need to replace Category 5

Da Liu was most anxious about the cable in the wall. In 2021, his family's renovation was covered in Category 5, but when he heard it was 2000M, he asked if he would have to smash the wall and reinstall Category 6. I showed him the standard: IEEE 802.3bz released in 2016, full name 2.5G/5GBASE-T, clearly stating that 2.5GBASE-T can stably run 100 meters on Category 5 lines. In other words, when the 2.5G speed project was initiated, it was designed according to the already implemented Category 5 systems worldwide, with no intention of requiring you to re-wield the cables. To get 5G, you need Category 6, and for 10Gbps, Category 6 must be kept within 55 meters.

I dare to write this because so many people have tested it. Posts online about Category 5 running 2.5G are everywhere, and the conclusion is basically consistent: stable within 100 meters. Two exceptions need to be explained: first, fake cables—copper-clad aluminum, four-core wires—can't even run gigabit wires, don't expect 2.5G. how to identify fake wires by scraping and burning them, I've written before; Second, the crystal connector may oxidize and the wall connector may age, so it won't be able to negotiate with 2.5G and automatically downgrade to gigabit. You can check the speed at a glance in the router's backend or computer network card status. The Da Liu family line was genuine during renovation, about ten meters long, and it passed the test directly.

Threshold Three: Router, a device worth 159 yuan determines success or failure

was where Liu was truly blocked. His router was a gigabit dual-band with a gigabit port and a gigabit WAN port, bought three years ago. After switching to a 2.5G optical modem, the section from the modem to the router was immediately plugged back to 940 by the WAN port. When choosing a router, choose one: at least one 2.5G WAN port, preferably with a LAN as well. His budget was just over 100 yuan. I pointed him to Xiaomi BE3600 2.5G version , 159 yuan, one 2.5G port plus three gigabit ports—2000M incoming line plugged into a 2.5G port, gigabit port connected to TV boxes or printers that can't reach gigabit capacity, so it worked out perfectly. The BE6500 with four ports above is a full 2.5G port, and above that is the BE7000, which has four solid 2.5G ports.

on the day you change routers, remember to copy the WiFi name and password the same device as before, seamless switching between all family devices, saving you from reconfiguring one by one. After the replacement, there's still one last hurdle: the computer for speed testing. Da Liu's desktop has an onboard gigabit network card. I happened to have a 2.5G USB network card in my drawer. something worth about thirty yuan, to plug it in. The business hall app's wired speed check is running—2350 Mbps.

stared at that number for a long time and said: This 2000M has been spent half a month ago, and my own device has been holding me tight.

after upgrading to 2000M, phones actually run faster than desktops

speed test, I casually discovered something interesting: my phone connected to the new router's 5G band and measured over 1300 Mbps; The desktop network cable is plugged in, 940. Mobile phones are faster than computers. The logic isn't complicated—desktop gigabit network cards capped at 940, and the phone negotiated with a WiFi 6 router for 2402 speed, you can get a 50-60% discount or 1300 yuan. So after upgrading to 2000M, I first tested wirelessly with my phone. The numbers look better than on a desktop—don't think it's just speed testing software leaking the rules. If you really want to add wired ones, a 2.5G USB network card is the cheapest option. There's another old rule for speed testing: the service hall app only recognizes this for internal network segments, the repair request. Lower rates for web versions and third-party apps don't count.

the extra 1,000 trillion, only three places would be useful

accounts must be honest. During the evening rush hour, FamilyMart's concurrency was laid out: three 4K streaming channels at most 75 Mbps, mobile games under 1 megabyte, NAS backups to the cloud taking up 30 megabytes, plus over ten megabytes from watching short videos and live streams, totaling around 120 Mbps—gigabit alone is a huge margin. With the extra 1,000 trillion, I counted it all over and over, and there are only three scenarios where I can really use it in daily life.

First, it is a major downloader. Less popular resources on the server side can still be slow, but big factory sources like Steam and system updates can really consume tens of MB per second. Taking a 200GB game as the standard: Gigabit max 110MB/s, finished in just over half an hour; 2000MB at full power at 250MB/s, if the server can handle it, it takes about fifteen minutes. If you download two major titles a month, spending twenty yuan is definitely worth it. Second, if you have a 2.5G internal network at home, the NAS should have a 2.5G port, and the computer should have a 2.5G network card. Internal network copying can go from 110MB/s to around 280MB/s, which is a real speed boost compared to broadband itself. Third, the NAS uses dual gigabit ports, so two cables run SMB multiple channels bundled together can still reach about 200MB/s. Besides that, the bitrate for watching videos and gaming data are already enough for 100MB in 2016, which has nothing to do with 2000MB. By the way, it's normal for the nighttime speed test to drop by 10% after upgrading to 2000M, and the shared temper at the exits won't change just because you speed up.

looking back the calculations I did before, the conclusion still holds for 2000M: 100 to 300 km is a qualitative change, 300 liters for most households don't feel anything, and 2000 gigabits for gigabit has a longer no-feeling range. If you really want to get it, I'll arrange the order for you: before applying for speedup, ask three questions on the phone—whether you can get a 2.5G optical modem, if you need to pay extra, and if the technician comes to replace it yourself; On the day of delivery, check the two marks—the 2.5G port of the optical modem and the 2.5G port of the router. Make sure not to plug in the wrong cable; for acceptance, test with a 2.5G network card wired or wirelessly with your phone. Don't be like Big Liu—just handle it first, then investigate—half a month of excitement was wasted.