BTS3900(a) Hardware Description for 2G&3G -> Does anyone have it?

Hello all,

I need to model BTS3900 and BTS3900a for both 2G's and 3G's configuration in a NMS system. I looked at the forums but the files that might contain these devices' hardware configuration were removed. And the documents I found on internet are not good enough to accurately model the device. Does anyone have anything to help me(hardware description, key technical points etc.)?

Thanks in advance.