7
Troubleshooting your Internet Connection
This section will walk you through some troubleshooting steps if your USB
modem did not connect to the Internet. To do this you will need to install a
terminal program to talk to your modem if you do not already have one
installed. Windows users can use Putty and Raspberry PI users can use
Minicom.
If your modem is installed in an embedded Linux environment we
recommend that you install it on a Windows or Linux computer. This will help
you determine if the modem is at fault or if it’s an issue with your embedded
environment.
To use the modem with a terminal program, you will need to know what
COM port the modem is installed on. To determine the COM port, follow the
instructions for your OS below
Windows users: Type
Device Manager
in the Windows Run box and select
Device Manager. When Device Manager opens, click on
ELSx Modem
, then
right-click and select
Properties
. Click on the
Modem
tab, andthen the COM
port is displayed on this tab.
Raspberry Pi/Linux Users: Assuming you have no other modems installed,
then the modem should be on ttyACM0. To confirm this setting enter
dmesg | fgrep ACM
in your terminal window. The modem installs 5 ACM
devices. Use the first device in the list when configuring Minicom.
Now that your terminal is configured, we will walk through some
troubleshooting steps.
Step 1:
Confirm that the modem has a SIM correctly installed and the
modem can talk to the SIM. In your terminal window, first enter the
command
ATE1
to enable command echo so you can see what you are
typing. Next, enter the command
AT+CIMI
and press
Enter
. The modem
should return a 15 digit number. If it returns a 15 digit number continue to
Step 2
below. Otherwise, confirm that you have a known, working SIM card
installed. If you are sure the SIM card is good, it’s possible the problem is
with the modem. See
If you Need Help
below to contact Zoom support.
Step 2:
Check that your APN is configured correctly. Enter the command
AT+CGDCONT?
A typical response for the APN would be:
CGDCONT=1,
“IPV4V6”, “apn name”, 0
,
where apn name is the name of the apn supplied
