Modem Disconnecting

Sierra Wireless AirPrime Modem Card Topics
Cheburashka
Posts: 5
Joined: Sun Apr 15, 2018 1:39 am

Re: Modem Disconnecting

Post by Cheburashka » Sun Apr 15, 2018 7:30 pm

Actually I'm back to periodic disconnects.. :(

When it disconnects, it looks like the router admin page is also inaccessible.

I'll try cleaning the SIM card as well, although not sure how it could become dislodged.

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Jflex113
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Location: Small town in Michigan

Re: Modem Disconnecting

Post by Jflex113 » Tue Apr 17, 2018 5:00 am

Do you have the modem reconnect enabled? If you have it set to router reboot during a lose of ping then that can happen.

It should look like this when enabled with modem reconnect if you are using it.

Modem Reconnect 1.jpg


If the router reboots every time you loose internet connection then this setting (if it is selected) could be your issue.

Modem Reconnect 2.jpg


I would check this to eliminate one possible cause of the router not being accessible during a lose of internet.
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"If you're going to be ignorant, you'd better be rich." - Cody D.

Brady_ls
Posts: 8
Joined: Fri Mar 30, 2018 12:55 pm

Re: Modem Disconnecting

Post by Brady_ls » Wed Apr 18, 2018 9:35 pm

JimHelms wrote:
Sun Apr 15, 2018 7:17 am
Brady_ls wrote:
Sat Apr 14, 2018 6:24 pm
I tried re-flashing firmware and Configuring the MC7455. Same issue, but here is connection log and debug info from after ding this.

Sat Apr 14 23:18:36 2018 : /dev/ttyUSB1 AT+CGDCONT?
+CGDCONT: 1,"IPV4V6","r.ispsn","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
The logs you posted really does not tell much other than showing r.ispsn is the APN you are trying to connect to the network with. Need to copy and past the reset of the information with the antenna signals that will be in that same window.

I also assume your APN is r.ispsn on your hotpot as opposed to n.ispsn?



Hi Jim,

I ran through each step in the troubleshooting, and no dice... my APN is the r.ispsn not n.

Here is the copy paste from debug....

Code: Select all

Current Time:  1483		Temperature: 21
Reset Counter: 1		Mode:        ONLINE         
System mode:   LTE        	PS state:    Not attached 
LTE band:      B25    		LTE bw:      10 MHz  
LTE Rx chan:   8640		LTE Tx chan: 4294967295
LTE CA state:  NOT ASSIGNED
EMM state:     Deregistered   	Attach Needed  
RRC state:     RRC Idle       
IMS reg state: No Srv  		
PCC RxM RSSI:  -76		RSRP (dBm):  -109
PCC RxD RSSI:  -75		RSRP (dBm):  -106
Tx Power:      0		TAC:         5001 (20481)
RSRQ (dB):     -14.8		Cell ID:     0A001700 (167778048)
SINR (dB):     -2.6
OK

Code: Select all

Thu Apr 19 02:34:08 2018 : /dev/ttyUSB1 AT+CSQ
+CSQ: 19,99
OK
AT*CNTI=0
+CME ERROR: no network service
AT!SELRAT?
!SELRAT: 06, LTE Only
OK
AT+ECIO?
+ECIO: NOT IMPLEMENTED
OK
AT+RSCP?
+RSCP: NOT IMPLEMENTED
OK
AT!UMTSCHAN?
!UMTSCHAN: NOT IMPLEMENTED
OK

Code: Select all

AT!GSTATUS?
!GSTATUS: 
Current Time:  1494		Temperature: 21
Reset Counter: 1		Mode:        ONLINE         
System mode:   LTE        	PS state:    Not attached 
LTE band:      B26    		LTE bw:      5 MHz   
LTE Rx chan:   8763		LTE Tx chan: 4294967295
LTE CA state:  NOT ASSIGNED
EMM state:     Deregistered   	Attach Needed  
RRC state:     RRC Idle       
IMS reg state: No Srv  		
PCC RxM RSSI:  -66		RSRP (dBm):  -96
PCC RxD RSSI:  -67		RSRP (dBm):  -102
Tx Power:      0		TAC:         5001 (20481)
RSRQ (dB):     -15.6		Cell ID:     0A001F10 (167780112)
SINR (dB):     -1.6
OK

Brady_ls
Posts: 8
Joined: Fri Mar 30, 2018 12:55 pm

Re: Modem Disconnecting

Post by Brady_ls » Wed Apr 18, 2018 9:46 pm

Modem> Network Status> General Information> Modem jumps between "Sierra Wireless, Incorporated MC7455" and "no modem present."

"Does no modem present" refer to communication between the router and the card?

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Jflex113
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Location: Small town in Michigan

Re: Modem Disconnecting

Post by Jflex113 » Wed Apr 18, 2018 10:43 pm

Is your modem inside a router like a ZBT or is it in an enclosure? If it is in an enclosure I'm wondering if the usb cable is not good enough and that might be causing these disconnects possibly.
"If you're going to be ignorant, you'd better be rich." - Cody D.

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JimHelms
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Re: Modem Disconnecting

Post by JimHelms » Thu Apr 19, 2018 7:55 am

Brady_ls wrote:
Wed Apr 18, 2018 9:46 pm
Modem> Network Status> General Information> Modem jumps between "Sierra Wireless, Incorporated MC7455" and "no modem present."

"Does no modem present" refer to communication between the router and the card?
This is normal behavior when Connection Monitoring is enabled with Modem Reconnect, and the modem cannot stay connected to the network and/or its pings returned. When this happens, the modem is rebooted and will not be detected during the process.

Compare your logs to the image I posted earlier. Your issue also appears to be antenna/connector/signal related.

k9kfx
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Joined: Tue Apr 24, 2018 12:10 am

Re: Modem Disconnecting

Post by k9kfx » Fri May 18, 2018 5:50 pm

Same problem I have on sprint with the same setup. Apparently you have to have advisability perfect signal with a perfect 20 sinr to stand a chance. T-mob sim in exact same setup with worse signal and I get 2 bands 20mhz no disconnects for 2 days now. Hmmm.

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JimHelms
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Re: Modem Disconnecting

Post by JimHelms » Sun May 20, 2018 8:16 am

Same problem I have on sprint with the same setup. Apparently you have to have advisability perfect signal with a perfect 20 sinr to stand a chance.
A perfect SINR of 20 is not required. But it must be within acceptable levels to maintain a connection.
RSRQ (dB): -14.8
SINR (dB): -2.6
RSRQ (dB): -15.6
SINR (dB): -1.6
These reading are well below acceptable levels. Compare these readings to the chart below:


Signal Readings.png

Have you tried relocating the router to a different location in an attempt to approve the signal?
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