The company I work for, we import both DC files from a TSC3 collector as well as a CAL file from our new TSC7 tablet. When we import the DC file we are able to see the base station location that the calibration came from as well as the vectors. When we import the CAL file all we see are the calibration points and no base station info or vectors. The TSC7 does export a DC file but it seems there is nothing in it unless I am doing something wrong. I like to be able to see the base station info because our foremen need it to set up there own base station when on the site and need the info from that setup. I attached 2 pics, one with a DC file imported and the other with a CAL imported. The red circle in the "DC" file one is our base station location and setup.
I assume you are running SCS900 on the TSC3 and SiteWorks on your TSC7? I'm not all that familiar with Construction field software, however I would recommend you talk to your dealer or work colleagues and find out the correct workflows for getting data from SCS900\SiteWorks into TBC. The DC file format dates back to Survey Controller and did originally contain the entire job (points, vectors, coordinate system, site calibrations, etc). I'm not sure what SiteWorks exports in the DC file but from your description if could just be the calibration parameters.