Why does the lte1 interface disappear after some time after connecting the Yota Wi-Fi modem to the Mikrotik RB951G-2HnD?

Question

Yota

Hello.
I have been unsuccessfully trying to connect my Yota Wi-Fi modem to the Mikrotik RB951G for several days now. After connecting, the modem may take some time (from 30 seconds to a minute), and then the lte1 interface starts blinking. It turns on, then it turns off. Firmware for Mikrotik updated to the latest from the office. site. Then I found 6.7 on the Internet, also installed it, but still it does not solve my problem. Could there be a power problem if the router itself can distribute Wi-Fi in this state.
In the Mikrotik logs, you can find the following message:

dhcp-client on lte1 lost IP address 10.0.0.12 - lease stopped locally

Tried this:

do this:
Remove the power from the board, unplug the modem, then plug the modem back to the
board and only then power on the board.
then check if the modem is recognized or not.
I have earned. and it gives enough power for any whistle.
you can also look in /system resource usb print if it's like this:
> /system resource usb print
# DEVICE VENDOR NAME SPEED
0 1:1 Linux 3.3.5 ehci_hcd RB400 EHCI 480 Mbps
1 1:11 HUAWEI Technology HUAWEI Mobile 480 Mbps
means everything is fine.

The terminal showed me my router. The first line was missing.

Answer 1

This happened to me when I used an extension cord.
Moreover, it didn’t work at all through an extension cord “with an amplifier”, through a long extension cord - the USB modem “blinked”, then it appears, then it disappears, and through a short extension cord it fell several times a day.
Through Mikrotik's NetWatch, I set up a system for fixing this problem - the script sent me an email about the crash and turned off the power on the USB port for 3 seconds.
================
/tool ​​e-mail send from="[email protected]" [email protected] server=smtp.domain.ru subject=("LTE Down") body=("LTE Down.\nTime and Date stamp: " . [/system clock get time] . " " . [/system clock get date])
/system routerboard usb power-reset duration=3
=== =============
UPD: I must say that after I set it up, I receive reports about the fall of LTE 2-5 times a day.
The power supply in the office is stable.
I found this connection option:
routerboard.com/5VUSB
I stuck it through it. Tried several different 5V power supplies.
But as before, LTE drops several times a day.
Theoretically, it may be that this does not drop LTE, but just a few pings are missed.
But the LTE connection in the office is good.

Answer 2

This happened to me when I used an extension cord.
Moreover, it didn’t work at all through an extension cord “with an amplifier”, through a long extension cord - the USB modem “blinked”, then it appears, then it disappears, and through a short extension cord it fell several times a day.

I confirm. Mikrotiks have some problems with USB termination on long lines. Connection with devices (tried on two different 4G modems) is very unstable, and unstable unstable, that is, it can constantly fall, or after a dozen or two power cuts it can rise for hours or more.
A simple USB hub as a repeater helps a lot. Better without external power to keep the possibility of a power reset, because the stability is still not one hundred percent.
This applies to the 951 series. It seems that on devices without the ability to reset USB power (mAP), everything works more stable, but also not perfect, and there is no way to restart.

Answer 3

mikrotik hap AC2 APPLICATION-HOUSEHOLD
For several days I suffered with a microt and connecting via yota lte modem (unstable connection)
saved the usb inj 5v cable. Apparently there is not enough power for the lte modem. most likely the converter does not pull from 12-28v to 5v. when connecting the adapter 5v 2.5A to the usb input, everything worked.
And if you disconnect the main power supply that comes with Mikrotik. the router continues to work, but the speed drops from 40 to 20 mb / s (maybe this is my subjective observation on speedtest)

Answer 4

where did you find firmware 6.7? www.mikrotik.com/download 6.15 latest at the moment.
Replace the USB extension cable I have had this ....

Answer 5

download.mikrotikindonesia.com/index.php?dir=Firmw...
Here

Answer 6

All Mikrotik firmware, if suddenly anyone needs it:
files.shelbybb.com/mikrotik

Answer 7

I have a modem without Wi-Fi, it also fell off constantly. I connected it via microusb connector (there are 2 of them on the modem - regular usb and micro) - for 3 days without freezes.

Answer 8

Here is the same thing happened. The main thing was that everything worked while I was testing it, but as soon as I installed everything on the roof and pulled the wires thoroughly, it stopped. The power wire is extended with a twisted pair (4 wires per pole), but during the test it was the same. Still, I sin on power, but I still don’t understand how to decide: power by POE, use a power injector or an active hub ...

Answer 9

At some point, Mikrotik stopped seeing the modem at all.
The following helped:
1. You need to set the USB power supply delay (Boot Delay)
at the time the device boots 2. Completely turn off the Mikrotik (do not reboot) and turn it on with the modem already connected