The telecom optical modem was plugged into the mobile broadband. The two modems were plugged into each other for one night and got stuck on the second lock.

My cousin's house was upgraded to Gigabit a while ago, and the master replaced it with a Shin Kong cat. The old Huawei HS8145V5 was retired, and he asked me if this thing can still be sold second-hand. I have exactly two broadband lines at home, one for Telecom's main line and one for China Mobile's secondary line - as mentioned in 819's article about dual broadband, China Mobile's line is given free of charge when signing up for a package, and is specialized in dirty work such as downloading and monitoring. I thought at the time that I might as well use this telecom HS8145V5 to replace the old cat on the mobile line. Anyway, it's all photoelectric conversion, so in theory it should work the same.

As a result, after plugging it in all night, the PON light flashed until dawn, and registration failed. After switching to the original mobile cat, the PON light stays on for two minutes and everything is normal. The same optical fiber, the same leather wire, the only difference is the cat itself. This article will clearly explain the "two locks" that I later figured out, saving you a whole night of wasted effort.

Declare the conclusion first: Cats don’t pick the operator, they pick the roster of the computer room.

Let me correct an assumption first: The optical modem hardware itself is operator-agnostic. What it does is photoelectric conversion, and anyone’s laser can do it. When you see “telecom-specific” and “mobile customization” online, what do you mean? Shell silk screen and access control in firmware , it is not that the hardware is born to recognize only one family.

What really stops you is the computer room. Each optical fiber is finally connected to the OLT equipment in the operator's computer room. The OLT holds a "roster" in its hand - which optical modems have registered ID numbers that can register for Internet access. The ID number of your Telecom cat is only registered in Telecom's OLT roster and plugged into the mobile line. If there is no such cat in the computer room, the authentication is straightforward.

Therefore, the answer to the question "Telecom optical modem plugged into mobile broadband" is divided into two levels.: Whether the physical layer can be connected depends on the format. ； Whether you can pass the registration level depends on the certification. It only works if you pass both floors. My HS8145V5 was stuck on the second floor.

first lock: If the system doesn't match, even light can't get through the door.

I am using the word "standard" The article about changing the optical modem Just mentioned it: The PON network is divided into two major systems: EPON and GPON. For upward upgrades, there is 10G-PON, which is further divided into two routes: 10G EPON and XG-PON (this is in Comparison between Tianyi Gateway 3.0 and 4.0 (Tear it down finely). The optical signal specifications of the two routes are different. The format is wrong and the physical layer is directly blocked. , the performance is that the LOS light flashes red or does not light up at all, which is a symptom of the fiber being broken.

What do you think of the format? Look through the sticker on the back of the cat and look for the words "GPON" or "EPON", which are usually printed near the model number. If there is no sticker, go to the background and check the PON mode in the system information. It should be noted that the same model often has two hardware versions. The model name alone is not accurate, you have to look at the sticker.

The standards of the three operators are not uniform across the country and are related to the history of network construction in each province. They may be different in different areas of the same city. So the first question when buying a second-hand cat is always: Which operator is your cat from, which province, and what standard is it? If you can’t answer the question, don’t buy it.

The night I took the actual test: The standard actually passed, stuck on certification

Let’s talk about that night. My cousin’s HS8145V5 sticker is marked GPON, and the central office of my mobile line happens to be GPON (most mobile areas started with GPON, and new communities directly connected to 10G XG-PON), so the first lock actually passed - the LOS light did not turn red, and the PON light began to flash long and rhythmically.

I have experience with this lantern language, If the PON light flashes for a long time, the optical path is clear and the registration is stuck. . My computer is plugged directly into the cat’s network port. 192.168.1.1 (This is the default address in routing mode, telecom version firmware). I looked at the "ONU registration status" on the status page, and it said "Registering" all night. I went to the network menu and flipped through the authentication information column. The authentication parameters written in this machine were still the authentication parameters of my cousin's home telecommunications. They didn't match the ones required by the mobile computer room. No matter how I flashed them, it was in vain.

The next day, I didn’t give up and took the original mobile cat back for comparison. The PON of the original cat is always on for two minutes, the background registration status is "Registered", and the parameters in the authentication mode column are completely different from those of the telecom cat. Only then did I give up: It’s not that the cat is broken, or that I did something wrong. This cat's "hukou" is in China Telecom, and the mobile computer room doesn't recognize it. .

The lining of the second lock: What exactly are the LOID, SN, and PLOAM passwords authenticating?

Let’s talk about the structure of this lock. It will be useful for you whether you want to replace a cat or buy a second-hand cat in the future. When OLT recognizes a cat, it recognizes a string of identity credentials. There are three common postures.:

I'm here for the LOID set Register your own optical modem Troublesome time: It's also a telecommunications company. If you change the cat and fill in the LOID, you can pass, because the roster recognizes the LOID number, not the cat machine. But it's different across operators. Telecom recognizes LOID, but the computer room on your mobile line may require SN and password. The two systems even have different "password formats", so there's no match at all.

What's even more troublesome is that even if both parties happen to use SN authentication, your SN must first be entered into the mobile ITMS backend before it counts. You can't do the inputting yourself, you have to have the installation and maintenance master or the sales office do it in the work order. in other words, Using Mode across operators is not a question of "can it", but a question of "who will go to the computer room to change the files for you?" ——And they have no obligation to change it for you.

Even if you get through it, there will be an ITMS behind you who doesn't know you.

Suppose you are lucky, the format is correct, the authentication is passed, the PON light is always on, and there is still a third level waiting. Successful registration only obtains the "qualification to access the Internet." The specific method of accessing the Internet - bridging or routing, which VLAN the IPTV uses, and where the voice port is registered - these business configurations are all remotely issued by the ITMS platform. I'm in ITMS's temper Pushing the configuration article in the middle of the night I wrote in it that China Telecom has its own ITMS, China Mobile has its own ITMS, and each only serves its own cat.

A cat that crosses over means it has no natal family: You registered but no one sent you the configuration. The broadband account, VLAN, and voice parameters all had to be filled in manually. If you make a mistake in filling in one place, you will be able to register without internet speed, or the IPTV screen will be black. It is easier to troubleshoot. Changing the bridge breaks IPTV Still around. I have seen a master on En Mountain actually succeed. The route is to telnet to escalate privileges to get super management, change the authentication mode, change the regional configuration, and then flash the firmware of the corresponding province. It takes half a day to complete the chain. You can play it, but that's something done by people who have fun in doing it.

Who can try, and who should give up as soon as possible?

It will be easier to make a decision once the accounts are calculated clearly. What are the benefits across carriers? Save money on a cat. Nowadays, second-hand optical modem of general-purpose models cost tens of yuan. The cats installed and delivered by the operator are originally rented to you (remember to return them when you cancel. The disassembly article Wrote an account for equipment compensation). In order to save dozens of dollars to upgrade the Telnet and flash the firmware, the time cost is completely upside down, and there is also the risk of bricking it - if it is really bricked, you have to disassemble the machine and solder the programmer, which is more expensive than buying ten cats.

There is a way that many people don’t know about: Use old optical modem without fiber optic plugs to connect them casually . Acting as an AP, a switch, or a small base station for an IoT private network. These methods do not require registration and have nothing to do with the operator’s half-cent fee. I wrote the details in The article about reusing old optical modem Inside. My cousin’s HS8145V5 was later used as a 2.4G IoT private network AP at my parents’ house, and it worked very well.

The order is also arranged for you.: First, turn over the sticker to confirm the system and ownership, and then decide whether you want to use it with fiber optic plug-in or without fiber optic plug-in. Don't force it if you can't keep up with the operators, while the latter can be directly transformed with zero threshold. A optical modem costs 30 yuan, don't compete with a PON light for one night - I'm the one who competes.