thank you for your reply.
Now I tried out another notebook.
The problem was not System Architect it was about hardware detection.
Dont't ask me why but the Fujitsu Siemens book detected the amp.
Finally I updated the Firmware via CLoader and I also checked System Architect for USB-Connection.
I see the amp in the network wizard, the buttons "Locate On" and "Locate Off) also works
(amp start/stop blinking).
After finishing this procedure by clicking on the finish button, System Architect don't add my amp as device.
A restart of SA also don't solve the problem.
A manual add of the device in the Venue View cause a "XTi - Offline"
Network Active, Devices: 1 Online:0 Offline:1
How can I get the amp online?