A while ago Ozymandias posted his code for a Cable Modem Check. I've also written similar code for my DSL modem. Both Ozymandias and myself use X10 (a home automation system .. x10.com) to power-cycle the modem. The particulars of detecting an outage and resetting your connection will vary based on too many factors to give you an absolute solution (DSL provider, protocol, modem brand/model, etc...). You may however be able to use the experiences of myself and Ozymandias as a starting point. My code works as follows: 
Ping the modem every 30 seconds
Ping the "internet" every 5 minutes
if either ping fails
    stop PPPOE process
    power-cycle modem
    while(modem not responding to pings for > 30 seconds after last po
+wer-cycle)
        power-cycle modem
    wait 10 seconds
    start PPPOE process
    wait 10 seconds
    ping internet
    if internet still not up, repeat entire process

[download]
I will be happy to post my complete code; if anyone is interested.

In reply to Re: Checking ADSL connection by lhoward
in thread Checking ADSL connection by JP Sama

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