Technical data

Note: If dial-in or dial-out is enabled but the DAS does not find a modem of the expected type or the modem fails to
initialize, the DAS will report this inconsistency as an error on its LCD and in its web administration pages, and continue
trying to detect and initialize the modem. If this error condition persists for an entire day (24 hours), the DAS will
gracefully reboot itself in a “last-ditch” attempt to fix any possible communication problem with the modem. This should
never occur in any normal operation or configuration scenario.
If any special Modem Setup string is needed, enter it here and press “Apply.”
Most “POTS” modems do not require any special setup string.
If the Modem is not found, use “USB Devices” page
If “Scan for New Modem” did not find the modem of the expected type, use the DAS's “USB Devices” page to verify the
modem is connected and “seen by” the DAS.
Here is an example of how the Radicom and TrendNET modems appear in the DAS's USB Devices page – unfortunately, the
brand and model number on the case is often different than the details available to the DAS via USB.
This example shows the MultiTech MTCBA-G-U-F4 GSM/GPRS modem as it appears in the USB Devices page:
If the modem does not appear in “USB Devices”, connect the modem to a PC and follow the modem vendor's instructions to
verify proper operation.
If the modem appears in the “USB Devices” list, but is not assigned a Port beginning with “ttyUSB...” or “ttyACM...”, this
means the DAS could not properly initialize the USB modem hardware. Typical reasons for this are:
1. The modem is defective – Connect the modem to a PC to confirm this. If the modem's vendor provides drivers and
support for their modem with a PC operating system such as MacOS or Windows, please attempt to determine if
the modem works properly with a PC when following the vendor's instructions.
Page 16 USB Modem Addendum