Technical data

The Dial-In Watchdog
If dial-in is enabled, the DAS will also enable a “dial-in watchdog timer”. The “dial-in watchdog timer” will cause the DAS
to gracefully reboot itself if it fails to successfully initialize the modem to receive incoming calls at least once every 24
hours.
To be clear: The DAS does not need to actually receive a call every 24 hours, it simply needs to communicate with the
modem and successfully prepare to receive dial-in calls once every 24 hours.
The one exception to this is if the “Remain connected after upload” option is enabled in the “Dialout Setup” page – if the
DAS sees that the modem is in-use, it will ignore its “dial-in watchdog timer”.
This feature is intended to provide extra safety for DAS's installed in remote locations which are not easily serviced, where
dial-in may be the only means of communication.
In normal operation, the “dial-in watchdog timer” should never trigger. The DAS will usually initialize the modem and
begin listening for an incoming call within 10 seconds of the modem hanging up from a previous call, and the DAS will
reinitialize the modem to receive incoming calls once every hour for safety.
Test Dial-In by Having Someone Call into the DAS
Once “dial-in” is enabled, you should test it by having someone call the AcquiSuite/AcquiLite, connect via PPP and login
using one of the 3 standard user accounts:
• admin
• operator
• user
The following messages will be shown on the AcquiSuite/AcquiLite's LCD when a call is received.
LCD Messages while Dialing-In
Ready for Incoming Call
Indicates the DAS has initialized the modem and is ready to answer a call:
Dial-in: Answering Call
The DAS has detected a “ring” and is attempting to answer the call
Page 26 USB Modem Addendum