Check Cellular Signal Strength; Verify Serial Connectivity - Digi TransPort LR54 User Manual

Diagnostics and troubleshooting

Check cellular signal strength

1. While the internet link is still connected from following steps in
access the command line interface. See
2. Enter the show cellular command. In the output, view the values displayed for the Signal
strength and Signal quality fields:
digi.router> show cellular
SIM Status
--------------------------------------------------------------
1-1 Up
1-2 Down
2-1 Up
2-2 Down
3. Check that the signal quality is roughly what you normally get with the same antenna in the
test location, which should be +/- 10 dBm. If the signal strength is much worse than normal:
Swap the antennas with another set.
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Insert a SIM card from a different carrier.
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4. Ideally, repeat the test on a known working TransPort device that contains the same type of
radio module in the same location. Make sure this known working TransPort device is
connected using the same antenna and the same provider. If it does, and the signal strength is
much better (+ 10 dBm) than the suspected bad router, contact
the following subject line and problem description: Cellular signal strength low.

Verify serial connectivity

Problem
When using the command line interface, command output displays unusual or garbled characters.
Probable causes
Serial cable is bad.
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Wrong type of serial cable is being used for the serial connection.
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Wrong pinout being used for the serial connection.
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The baud rate setting for serial communication is set to different rates on either end of the
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connection.
Solution
Test the serial connection.
1. Using a straight-through serial cable, connect a PC serial port to the TransPort device. For
pinout details, see the hardware reference guide for your model.
2. Open a terminal application such as PuTTy, with the following serial port configuration:
Digi TransPort WR Routers User Guide
Access the command line
APN Signal Quality
broadband Good (-93dBm)
vzwinternet Good (-102dBm)
Troubleshooting
Verify cellular connectivity,
interface.
PIN Status
No PIN needed
Unknown
No PIN needed
Unknown
Digi Technical Support, with
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