Raising an Alert ,when the Legacy system is down

Hi,

I want to raise an Alert or some thing when my Source Legacy system is down.

My scenario is File -to - IDOC . I'm getting all the XML files from the FTP server. so, My source system is FTP srever . Due to network problem or some other problem my FTP server is getting down very frequently. Now i want to send this information to respected persons in a automated way.

Is there any option that know the Legacy server status , How can we know that FTP server is down .

Please suggest me some solution for this type of prblems.

Regards

Jain