Important Info: Because of the trouble with github about the pressure to 2FA I will move to https://codeberg.org/
There are some documents in the directories english / deutsch ...
Look at:
https://www.aatis.de/content/bausatz/AS607_C5-PR-Modem-1k2-und-9k6
https://www.aatis.de/content/bausatz/AS296_USB-9k6/1k2-PR-Modem