WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

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JimHelms
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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by JimHelms » Fri Mar 13, 2020 9:55 am

robonova wrote:
Fri Mar 13, 2020 9:07 am
Also, I'm not seeing a band locking tutorial, can you point me to a good one?
Try HERE.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by robonova » Fri Mar 13, 2020 11:02 am

JimHelms wrote:
Fri Mar 13, 2020 9:55 am
Try HERE.
Thanks again Jim. I made some edits to my last post and added some logging because my modem disappeared last night and I had to reboot it to bring it back. I was getting kicked off WiFi some too but I think I fixed it by disenabling "Dissassociate On Low Ack"

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by JimHelms » Fri Mar 13, 2020 11:23 am

The first thing I would do is disable Connection Monitor if it is enabled. Looks from the log it is:

Code: Select all

Connection Monitor: Start Connection Monitor for Modem 1
If you will look under Services tab, you will see LteFix Ping. Enable that and SAVE.

Then, do a hard (power off/power on) reboot.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by robonova » Fri Mar 13, 2020 11:44 am

If I go to "Connection Monitoring" in the default profile it says Connection Monitoring Status Disabled.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by robonova » Fri Mar 13, 2020 4:57 pm

JimHelms wrote:
Thu Mar 12, 2020 2:49 pm
This is what I would recommend.

Download the new release of the WiFiX version of GoldenOrb.

Use the Firmware Recovery Method to update with the WiFiX firmware.

Once it has updated, log into the router, and use the Web UI to update the router a second time with the WiFiX firmware.
So I did this yesterday and started seeing the same type of things happen with reboots and disconnects so today i did it again. It seems to work fine for a short time but then not and when I go to the login to the router I see this and I have to reboot:

/usr/lib/lua/luci/dispatcher.lua:234: /etc/config/luci seems to be corrupt, unable to find section 'main'
stack traceback:
[C]: in function 'assert'
/usr/lib/lua/luci/dispatcher.lua:234: in function 'dispatch'
/usr/lib/lua/luci/dispatcher.lua:127: in function </usr/lib/lua/luci/dispatcher.lua:126>

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BillA
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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by BillA » Mon Mar 16, 2020 4:47 pm

robonova wrote:
Fri Mar 13, 2020 4:57 pm
So I did this yesterday and started seeing the same type of things happen with reboots and disconnects so today i did it again. It seems to work fine for a short time but then not and when I go to the login to the router I see this and I have to reboot:

/usr/lib/lua/luci/dispatcher.lua:234: /etc/config/luci seems to be corrupt, unable to find section 'main'
stack traceback:
[C]: in function 'assert'
/usr/lib/lua/luci/dispatcher.lua:234: in function 'dispatch'
/usr/lib/lua/luci/dispatcher.lua:127: in function </usr/lib/lua/luci/dispatcher.lua:126>

The most common cause for random reboots, modem disconnects is an under powered router.
Either the power supply is unable to supply enough amperage despite what's on the label, or during load spikes (modem/WiFi transmissions) it's simply unable to keep up with sudden load increases. Try another 2.5Amp power supply, or better yet one with over 3amps.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by bigman247 » Fri Mar 20, 2020 10:33 pm

We ended up going the DMZ route on the WE826-T2 and buying a separate router. So far it's been rock solid. I never did figure out which device(s) were causing the WiFi to crash.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by zbigb » Wed Mar 25, 2020 3:00 pm

Depending on the LTE frequency and WiFi channel you are locked on to there can be interference. My modem is locked into Sprint band 41 (2496 MHz - 2690 MHz). The WIFI 2.4Ghz band ranges from 2401 MHz up to 2495 MHz depending on the WIFI channel the router locks into. After shutting the WIFI off in my WE826 and using a separate WIFI router nowhere near the modem, there are far less required modem reboots and a higher quality LTE signal. Higher LTE speeds as well. I believe the adjacent bands and adjacent transmitter/receivers did not play well.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by BillA » Wed Mar 25, 2020 8:50 pm

zbigb wrote:
Wed Mar 25, 2020 3:00 pm
Depending on the LTE frequency and WiFi channel you are locked on to there can be interference. My modem is locked into Sprint band 41 (2496 MHz - 2690 MHz). The WIFI 2.4Ghz band ranges from 2401 MHz up to 2495 MHz depending on the WIFI channel the router locks into. After shutting the WIFI off in my WE826 and using a separate WIFI router nowhere near the modem, there are far less required modem reboots and a higher quality LTE signal. Higher LTE speeds as well. I believe the adjacent bands and adjacent transmitter/receivers did not play well.

It seems to be the WiFi chips in the WE826 router along with the modem which sometimes create high load spikes depending on the transmitter power, thereby causing reboots. It kind of defeats the whole purpose of having an all-in-one router, but it can be mitigated with a higher than 2Amp power adapter. From my experience using a WG3526 with a 2.5Amp or higher power adapter works without reboots.

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Re: WiFi Dropping on WE826-T2 w/ Sierra Wireless MC7455

Post by zbigb » Thu Mar 26, 2020 8:37 am

Using a higher current supply definitely helps. Have you tried the 2.5 Amp power adapter with a WE826? The data sheets for the MT7620 wifi chip show it draws 840mA normally and can draw peaks up to 1400mA. The 7455 can draw 1100mA continuous when transmitting and can draw more momentarily. There are a lot of variables for current draw for both of these packages and the WE826 can easily use 2 amps under normal conditions. What also complicates things, is that many supplies don't really put out what they are rated for. I was running into disconnect problems, especially when running in aggregated mode so I switched to a 5 amp supply to clearly eliminate the supply question. I only mentioned the adjacent frequency band interference because I could see the RSSI and SNR change when the WIFI transmitter is near the LTE antenna. It does not matter if the WIFI source is from the WE826 or an external hotspot, the RSSI changes. Maybe that's just the price to pay for all in one convenience.
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