Spontaneous drops of the LTE interface in Mikrotik Chateau LTE12 with the EG12-EA

Dear Quectel representatives!
When will the problem with spontaneous drops of the LTE interface in Mikrotik Chateau LTE12 with the EG12-EA module be finally solved? Now it has firmware revision EG12EAPAR01A11M4G, but the problem has not disappeared.
The problem occurs with different SIM cards, different mobile operators.

09:04:32 lte,async,raw lte1: rcvd +QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,250,99,BC6A607,333,1301,3,4,4,28A,-92,-12,-62,17,-,150,-
09:04:32 lte,async,raw lte1: sent AT+QCAINFO
09:04:32 lte,async,raw lte1: rcvd +QCAINFO: “pcc”,1301,75,“LTE BAND 3”,1,333,-91,-12,-58,15
09:04:32 lte,async,raw lte1: rcvd +QCAINFO: “scc”,3300,50,“LTE BAND 7”,1,999,-118,-15,-93,0
09:04:32 lte,async,raw lte1: rcvd DL
09:04:32 lte,async,raw lte1: sent AT+QXPOWER
09:04:32 lte,async,raw lte1: rcvd +QXPOWER: -80,210,-32768,50
09:04:32 lte,async,raw lte1: sent AT+QNETINFO=“cmr”
09:04:32 lte,async,raw lte1: rcvd +QNETINFO: “cmr”,9,3,1,2
09:04:32 lte,async,raw lte1: sent AT+QRSRP
09:04:32 lte,async,raw lte1: rcvd +QRSRP: -94,-90,-140,-140
09:04:32 lte,async,raw lte1: sent AT+QNWCFG=“lte_rx_power”
09:04:32 lte,async,raw lte1: rcvd +QNWCFG: -61,-57,0,0
09:04:35 lte,packet,raw lte1 mbim: wdm >>> recv #0
09:04:35 lte,packet,raw 07000080 48000000 00000000 01000000
09:04:35 lte,packet,raw 00000000 a289cc33 bcbb8b4f b6b0133e
09:04:35 lte,packet,raw c2aae6df 0a000000 1c000000 00000000
09:04:35 lte,packet,raw 01000000 00000000 00000000 00000000
09:04:35 lte,packet,raw 00000000 00000000
09:04:35 lte,debug lte1 mbim: >>> N service: connect, command: packet service
09:04:35 lte,packet lte1 mbim: status data:
09:04:35 lte,packet 00000000 01000000 00000000 00000000
09:04:35 lte,packet 00000000 00000000 00000000
09:04:35 lte,debug lte1 mbim: packet service: attaching class: 0 nwe:
09:04:35 lte,debug lte1 mbim: state 16=>14
09:04:35 lte,account lte1 session: 89546s 5303094716/1280192518 bytes 4275272/1983497 packets
09:04:35 interface,info lte1 link down

But at this time, the modem correctly responds to the AT + QPING command
[admin@MikroTik] > interface lte at-chat lte1 input=“AT+QPING=1,“netfiles.ru””
output: OK

Then, after a few minutes, the LTE interface spontaneously link up and Internet access appears again.

Technical support from Mikrotik could not establish the cause of the fall of the LTE interface.


图片

Thanks for you query in Quectel forums.
According to the AT log screenshot you provided above, the signal quality of the current module test environment is not very good, and the return result of QPING service will be very slow in an environment with poor signal quality. It is suggested to move the module and antenna to a better signal quality environment for testing, and verify whether there is effect in this way first. If you still have problems, you can grab a copy of the QXDM log to provide us with the recurrence problem. You can find the log capturing tool and procedure document at support@quectel.com, thank you.

Hi Kerr.Yang-Q!
I moved the module and antenna to a better signal quality environment for testing. But spontaneous link down LTE interface continue every 12-18 hours. Sometimes, lte1 link down after running Spedtest by Ookla (speedtest.net).
I received a response from a Quectel representative (Andrey Cherepanov | Field Application Engineer | Russia, Moscow) to my request on May 19, 2020 at support@quectel.com.
How can I get a copy of the QXDM log from a Mikrotik Chateau LTE12 device?
If it possible, please provide me with special software and instructions for obtaining the QXDM log.
I’m sorry, but I don’t have a wired internet connection. Only 3G / 4G from a mobile operator, no static public IP address.
Best wishes,
Dmitry.

1 Like

Hi,

I’ve the exact same problem with the firmware EG12EAPAR01A11M4G - EG12-EA modem on Mikrotik Chateau LTE 12.

Before the upgrade of the firmware was working good, but now i’m experiencing continuous disconnections every 4/5 hours. From the web interface the LTE module seems to be connected but without any internet connection. Moreover when it occour, there’s no more CA and only the B7 is connected.

Waiting for some news,

Luca

Hi Luca!
Quectel has informed me that they are aware of the problem and are working on a fix. I recommend that you write an official request to technical support with a description of the problem at support@quectel.com.
Dmitry