Cell Modem Connection Troubleshooting - Suspected SIM Card Issues
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Background
Section titled “Background”This guide is a landing page for Cell Modem Connection Troubleshooting.
Each Aircraft Compute Board has two sim cards, one for Compute A and one for Compute B.
This troubleshooting requires access to a log from the Aircraft.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
is-the-alarm-affecting-the-fleet-or-gen{"<small><b>Step 1</b></small><br/>Question: Is the alarm affecting the fleet, or ..."}
there-may-be-a-transient-issue-with-the{"<small><b>Step 2</b></small><br/>Question: There may be a transient issue with t..."}
return-the-aircraft-to-service("<small><b>Step 3</b></small><br/>Reference: Return the Aircraft to service.")
escalate-to-embedded-linux{{"<small><b>Step 4</b></small><br/>Escalation: Escalate to P2 Embedded Linux On Call."}}
open-up-a-log-from-the-aircraft["<small><b>Step 5</b></small><br/>Action: Open up a log from the Aircraft. Conf..."]
is-the-state-connected-not-registered{"<small><b>Step 6</b></small><br/>Question: Is the state CONNECTED_NOT_REGISTERED?"}
the-sim-card-issue-may-have-been-resolve["<small><b>Step 7</b></small><br/>Action: The SIM card issue may have been reso..."]
power-cycle-the-aircraft-power-cycle-ai{"<small><b>Step 8</b></small><br/>Question: Power cycle the Aircraft Power Cycl..."}
return-the-aircraft-to-service-2("<small><b>Step 9</b></small><br/>Reference: Return the Aircraft to service.")
check-the-network-registration-status-i["<small><b>Step 10</b></small><br/>Action: Check the network registration status..."]
is-the-state-registration-denied{"<small><b>Step 11</b></small><br/>Question: Is the state REGISTRATION_DENIED?"}
follow-sim-registration-denied-failures["<small><b>Step 12</b></small><br/>Action: Follow SIM Registration Denied Failu..."]
this-is-not-a-sim-card-issue["<small><b>Step 13</b></small><br/>Action: This is not a SIM card issue. Return ..."]
is-the-alarm-affecting-the-fleet-or-gen -->|Yes| there-may-be-a-transient-issue-with-the
is-the-alarm-affecting-the-fleet-or-gen -->|No| open-up-a-log-from-the-aircraft
there-may-be-a-transient-issue-with-the -->|Yes| return-the-aircraft-to-service
there-may-be-a-transient-issue-with-the -->|No| escalate-to-embedded-linux
open-up-a-log-from-the-aircraft --> is-the-state-connected-not-registered
is-the-state-connected-not-registered -->|Yes| power-cycle-the-aircraft-power-cycle-ai
is-the-state-connected-not-registered -->|No| the-sim-card-issue-may-have-been-resolve
power-cycle-the-aircraft-power-cycle-ai -->|Yes| return-the-aircraft-to-service-2
power-cycle-the-aircraft-power-cycle-ai -->|No| check-the-network-registration-status-i
check-the-network-registration-status-i --> is-the-state-registration-denied
is-the-state-registration-denied -->|Yes| follow-sim-registration-denied-failures
is-the-state-registration-denied -->|No| this-is-not-a-sim-card-issue
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style this-is-not-a-sim-card-issue fill:#dcfce7,stroke:#22c55e,color:#14532d Hover or focus a block to preview it. Select the block to keep the preview open.
1 question
Is the alarm affecting the fleet, or generally more than a single vehicle at the same time?
2 question
There may be a transient issue with the cell network.
Wait 10 minutes and then resend the mission. Did the issue resolve?
Wait 10 minutes and then resend the mission. Did the issue resolve?
3 reference
Return the Aircraft to service.
4 escalation
Escalate to P2 Embedded Linux On Call.
5 action
Open up a log from the Aircraft.
Confirm that the cell connection state is
Look at the
Confirm that the cell connection state is
CONNECTED_NOT_REGISTERED.Look at the
state field in the cell_modem_status message. 6 question
Is the state
CONNECTED_NOT_REGISTERED? 7 action
The SIM card issue may have been resolved, or was mis-identified.
Return to Cell Modem Connection Troubleshooting to continue troubleshooting.
Return to Cell Modem Connection Troubleshooting to continue troubleshooting.
8 question
Power cycle the Aircraft (Power Cycle Aircraft). Did that resolve the issue?
9 reference
Return the Aircraft to service.
10 action
Check the network registration status in a recent log from the vehicle or dock.
Look at the
If you are looking at a Zip, check this topic from both Compute A and Compute B because each compute has an independent cell modem.
Look at the
eps_network_registration_status.registration_status field in the cell_modem_status message.If you are looking at a Zip, check this topic from both Compute A and Compute B because each compute has an independent cell modem.
11 question
Is the state
REGISTRATION_DENIED? 12 action
Follow SIM Registration Denied Failures.
13 action
This is not a SIM card issue. Return to Cell Modem Connection Troubleshooting for next steps.
Resolution note
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