User's Manual

990 | W-600 Series Controllers Dell Networking W-Series ArubaOS 6.4.x| User Guide
There may be more than one modem port; you can continue to send AT commands to determine which
ports are modem ports. If the port is not a valid modem port, a time out error is generated as shown in the
example below
Figure 231 Time out error example.
In the example below, the TTY port does not exist, or is busy with a previous PPP session.
Figure 232 Port I/O error
Once you find one (or more) modem TTY port, configure it in the cellular profile and test the port.
Testing the TTY Port
After your TTY port is correctly configured, the port is in the 'Device Ready' state.
Figure 233 Device Ready State
The 'Device Ready' state indicates the port has passed the diagnostic test and is ready.
You can also run extended diagnostics to displays more information about the modem.
Not all modems support the extended AT command set. If the modem hangs after sending an extended AT
command; removing the device and then re-inserting it usually fixes the problem
The AT+CSQ command queries is the modem's current signal strength. The first number represents the signal
ranging from 1 (poor) to 33 (excellent). In the example below, the strength is in the excellent range (31).
Figure 234 usb test extended.