I have a GX450 with integrated MC7354 LTE module. I have an AT&T mobile hotspot plan active on the router, and have been experiencing a strange issue ever since I got the plan up and running.
Every half hour or so, the router will lose LTE connectivity. Signal levels remain fine, but the cellular state goes from “Connected” to “No Service.” Without any intervention on my part, after about ten minutes or so of being out-of-service, the radio re-connects and everything starts working again. This process has been ongoing the past few days.
In the logs, I see the following sequence every time the router looses service and reconnects:
Jun 22 23:32:51 notice ALEOS_LINKMGMT_linkmon: Current: RSSI=-51, RSRQ=-8, RSRP=-75, SINR=12.3 Jun 22 23:45:06 warning ALEOS_LINKMGMT_servicemon: Ping Test failed to reach 22.214.171.124, Cellular is not connected Jun 22 23:45:06 notice ALEOS_LINKMGMT_linkmon: Radio Connection State - No Service Jun 22 23:45:06 notice ALEOS_LINKMGMT_linkmon: New Link Status - No Service Jun 22 23:45:09 err ALEOS_EVENTS_dpRptSend: Sending report to server failed for 10 reason Operation not permitted Jun 22 23:45:14 alert ALEOS_CONNECTMGMT: IPV4 Disconnect Handled Jun 22 23:45:30 warning ALEOS_WEB_ACEmanager: 192.168.100.2 - - Invalid or missing session token Jun 22 23:47:16 err ALEOS_EVENTS_dpRptGen: GPGGA Number of Satellites field is empty Jun 22 23:47:51 notice ALEOS_LINKMGMT_linkmon: Current: RSSI=-51, RSRQ=-8, RSRP=-75, SINR=14.6 Jun 22 23:50:06 notice ALEOS_LINKMGMT_linkmon: Network Watchdog - No reboot, Network Watchdog disabled by application [ 5 minutes ] Jun 22 23:52:27 notice ALEOS_SYSTEM_SM: Swapping container, new container:'SnF21.smc'... Jun 22 23:55:06 notice ALEOS_LINKMGMT_linkmon: Network Watchdog - No reboot, Network Watchdog disabled by application [ 10 minutes ] Jun 22 23:55:06 notice ALEOS_LINKMGMT_linkmon: Radio Connection State - Connected Jun 22 23:55:06 notice ALEOS_LINKMGMT_linkmon: New Link Status - Network Link Down Jun 22 23:55:09 err ALEOS_EVENTS_dpRptSend: Sending report to server failed for 10 reason Operation not permitted Jun 22 23:55:15 notice ALEOS_CONNECTMGMT: *** Network Connection successful. WAN IP [Cellular] : 10.128.xxx.xxx Jun 22 23:55:15 notice ALEOS_CONNECTMGMT: *** IP UP 10.128.xxx.xxx : wwan0 Jun 22 23:55:15 notice ALEOS_CONNECTMGMT: Setting WWAN MTU size to 1430 Jun 22 23:55:16 notice ALEOS_CONNECTMGMT: GDNS is restarting dnsmasq Jun 22 23:55:25 notice ALEOS_LINKMGMT_linkmon: New Link Status - Network Ready Jun 22 23:55:25 warning ALEOS_SERIAL_HMC: not in tcp mode current mode 0 Jun 22 23:55:30 alert ALEOS_LAN: MTU Source Auto - Set DHCP option 26 MTU: 1430 Jun 22 23:55:30 alert ALEOS_LAN: MTU Source Auto - Ignore Opt 26 MTU size 1500
When the router is disconnected, a status query of the MC7354 yields the following information:
AT!GSTATUS? !GSTATUS: Current Time: 3094Temperature: 39 Bootup Time: 0Mode: ONLINE System mode: LTE PS state: Attached LTE band: B4 LTE bw: 10 MHz LTE Rx chan: 2000LTE Tx chan: 20000 EMM state: Registered Normal Service RRC state: RRC Connected IMS reg state: No Srv RSSI (dBm): -50Tx Power: 0 RSRP (dBm): -77TAC: 486C (18540) RSRQ (dB): -11Cell ID: 0478E217 (75031063) SINR (dB): 5.4 OK
RRC Connected but IMS state of No Srv seems to indicate something strange going on, but my lack of knowledge on the particulars of LTE leaves me with no obvious troubleshooting steps.
I’ve tried both the ATT-specific firmware for the MC7354, as well as the generic firmware. Both exhibit the same behavior.
I’m at a loss as to what the problem is. When the radio is connected, LTE speeds are good and no issues with connectivity occur. Any suggestions for additional troubleshooting or logs to collect would be appreciated.