The difference between Mercury D191G and D191 is one letter, and the network port speed is ten times different.

The neighbor girl Xiao Zheng provided a router for the rental house. Send me the product link for verification.: There are two Mercury MAC1200Rs on the same page, the difference is 20 yuan. She asked me if she could buy the cheaper one, but I said don't rush to place the order yet - one of the two machines has a 100M port and the other has a Gigabit port, but the models are exactly the same.

The router model code is used by the manufacturer as the product number. We have to purchase the password to see it. This article will break down the Mercury model section by section and explain clearly, and then talk about Tengda’s rules. Once you understand it before placing an order, you can avoid the most expensive pitfalls.: After I bought the machine, I discovered that the broadband was choked by the network port.

Let’s first split the D191G into four sections. Each section has something to say.

The most classic naming format for Mercury is "letter prefix + two or three digits + optional suffix". Take D191G and split it into exactly four segments. Each segment has a meaning.:

My cousin’s D191G main router has been used for five years and is still working. The article about changing the LAN port IP The one in there was bought for 190 yuan back then, with three transmitters and three receivers, and all Gigabit ports. This foundation can be used today for a few more years. It is also the speed range of 19. The D191 without the suffix is ​​the 100M port version. It is plugged into Gigabit broadband and the speed is capped at around 94Mbit. The machine is not broken, but the physical upper limit of the network port is right there.

Let’s give two more examples of numbers.: 12 corresponds to AC1200 (2.4G 300M plus 5G 867M), D121G is this file ； 30 corresponds to AX3000 (2.4G 574M plus 5G 2402M), which belongs to the WiFi6 speed range. There is only one rule: the larger the number, the higher the wireless speed range, but it has no conversion relationship with the broadband megabytes. This matter will be discussed below.

The most annoying thing is the suffix G: One letter difference, network port difference ten times

Let’s settle the accounts first. The theoretical upper limit of 100Mbps port is 100Mbps, and the actual throughput is just over 90Mbps. ； The Gigabit port running Gigabit broadband can reach around 940 Mbit/s. The difference in the middle is not "faster and slower", but a tenfold relationship. As long as the broadband at home exceeds 100 Mbit/s, a 100 Mbit/s port will be a direct sentence of death, and the wireless signal will not be restored even if the wireless signal is full.

D191 and D191G, D121 and D121G are quite kind, at least the difference can be seen in the model. What really deceives people are old classics like MAC1200R: The same model was initially sold as a 100M port standard version, but later a Gigabit version was released without adding a single word in the model name. The twenty yuan price difference that Xiao Zheng saw was the two versions hanging on the page at the same time. Don't guess at this time, turn to the parameter table and look for the "Port" line - the one that says 10/100/1000Mbps adaptive is the Gigabit version, and the one that only says 10/100Mbps is the 100M version.

There is a more trouble-free test method. After you get it, plug in the network cable and wait for consultation.: The computer network cable is directly connected to the router LAN port. When Windows looks at the speed column in the Ethernet status, it shows that 1.0Gbps is a Gigabit port, and 100Mbps is a 100M port. I'm here for this move Write about Xiaomi 4A 100M version and Gigabit version I have also used that article. The backend interfaces of the two versions are exactly the same. It is most honest to plug in and watch the negotiation.

The pitfalls of second-hand platforms are even denser. Both D191 and D191G are now in circulation second-hand. The seller's title all states "Same model as Mercury D191G", but the pictures are taken from an angle without the tail label. I help people collect second-hand routers to develop a habit: Before placing an order, ask the seller to take a photo of the complete label on the back and read the model line before negotiating the price - the second-hand price difference of the 100M version and the Gigabit version is not big, but if you buy the wrong one, you will have to pay shipping fees when returning it.

By the way, I would like to remind you that the network port on the optical modem also has the same problem. I have seen the installer plug the network cable into the IPTV port more than once. The symptom is also capped at 93 MB. The identification article of optical modem Mou There is a special comparison table.

The number is the wireless speed range, don’t use it as the broadband megabyte number.

「The words "Wireless 1200M" are the most popular ones on e-commerce pages, but they are completely different from "Broadband 1200M". AC1200 refers to the theoretical speed of the two frequency bands of 2.4G and 5G adding up to 1167M. If a mobile phone can actually run 500Mbps or 5G with 5G, it is good, and there will be further discounts if the wall is blocked. Broadband refers to the speed of the line that the operator pulls into your home. 300 Mbits is 300 Mbits, and you don’t get more than one Mbit.

Use the numbers in the Mercury model number to compare the broadband. My experience is this::

There is another place where it is easy to misunderstand: The 2402M of the AX3000 is a number that can only be measured with a 2x2 antenna under a 160MHz bandwidth. When the mobile phone is connected to 80MHz by default, it is negotiated to be 1201M. This does not prevent it from being called AX3000, nor does it affect daily use, but the big number on the promotional page is the account under the most ideal conditions. That thing about bandwidth I wrote an article before, and I won’t be anxious if I understand where the negotiation figures come from.

It is too common for Gigabit broadband to be equipped with a 100M port. One reason is that the optical modem is plugged into the wrong port, and another reason is that buying the wrong version of the router has the same symptoms. How many megabits of broadband should be installed at home and how to estimate this number? I wrote a special article before , go through the equipment list at home and you will have the number.

These codes are currently on sale. What are their respective positions?

Mercury currently has three major models on sale through e-commerce channels.:

Phantom and Light Shuttle are the name of the appearance series. The X30G, X301G, and X306G are all AX3000 speed ranges and full Gigabit ports. The difference lies in the minor changes in appearance and antenna layout. Look for "AX3000 plus full Gigabit" and you will not buy the wrong range. The M series is a Mesh suit. It uses a pair of M6G to send signals to the room, with a single speed of 1900M. The whole process of networking and troubleshooting of sub-routing red lights Wrote this before. The M series number also means the speed level. The larger the number, the stronger the unit.

One thing should be kept in mind: All X series products on sale have full Gigabit ports, and currently there are no 100M versions for sale, which saves worry. But the G of X30G is more like the tail of the series, and the usage of "G=gigabit" in D191G is not necessarily the same thing - it is uncertain whether the pattern can be extended to new products. Always read the parameter list when inspecting goods, and don't memorize the letters.

In addition, the same model is also divided into hardware versions, such as V1, V2, and V3. You must download the firmware and find tutorials accordingly. Where can I find the model number and hardware version? There is a special article about the firmware and hardware versions on Mercury’s official website. Firmware upgrade article I have also stepped on it.

Let's talk about Tengda: Its fault is not in the network port, but in the Pro

At the sort8 stall, Mercury Tengda is sold together all year round, and Tengda’s rules are explained clearly. Tenda looks at the prefix: AC is WiFi5, AX is WiFi6, BE is WiFi7, and the following numbers are also speed levels - AX3 is AX1800 (574 plus 1201M), AX12 is AX3000 (574 plus 2402M, and also supports 160MHz bandwidth), and AX3006 is the channel iteration of AX3000. The good news is that the network ports Tenda sells are all Gigabit, and there is no pitfall like Mercury's 100M and Gigabit versions.

Tenda’s own pitfall is the suffix Pro. AX12 and AX12 Pro are two solutions: The Intel solution used in AX12 has average heat control. ； The AX12 Pro has been replaced with Broadcom dual-core 1.3GHz and 12nm process, and its reputation is obviously better. Colleague Xiaolin’s AX12 ( Frequency division article There are no major problems with the one I have used there, but if I want to buy a new one now, I will just switch it to Pro. The price difference is not big and the solution is one generation ahead. Just like the G in Mercury, the suffix letter looks inconspicuous, but the difference behind it is all real things. How to choose between the two complete machines? Comparison of Mercury’s five-year development Write more carefully.

ending: Check your seat and get your hands on a three-step inspection

Give me a direct copy: For broadband within 100 Mbit/s and transition to rental housing, D121G or even the 100 Mbit/s version is sufficient. ； For mainstream families with 200 to 500 MB, D191G is available at clearance price or go directly to X30G ； Gigabit broadband and a lot of equipment, X306G or M6G pair Mesh. As the budget goes up, the Mercury brand is not the best solution. Tenda AX12 Pro or other mid-to-high-end products are more suitable.

No matter which one you buy, don’t worry about the three-step inspection after you get it.:

• Look at the model suffix: D lace without G, determine the network port at a glance ； If you encounter an old model with the same name as 100Mbps or 100Mbps, go to the second step directly.
• Turn to the line of the port in the parameter table: 10/100/1000Mbps adaptive is the Gigabit port
• Plug in the network cable to see the negotiated speed: If it shows 1.0Gbps, it’s done. If it shows 100Mbps, please contact us for return.

The last thing Xiao Zheng ordered was the X301G, which cost more than 160 yuan, and the rental house had a full 300Mb broadband. It was forty yuan more expensive than the 100M version she was originally struggling with, but the forty yuan bought ten times the upper limit of the network port, so it was not a loss no matter how you calculated it - if you could read half of the model code, you would already win over most people who placed orders with their eyes closed.