The 41800 Data Interface allows the Fireberd mainframe to test communications equipment and systems that comply with CCITT G.703, G.704, G.732, 2048 kbps, and Nx64 kbps signal recommendations for framed or unframed data. The interface allows any selection of Nx64 kbps timeslots within the 2.048 Mbps signal to be accessed for bit error analysis. This allows real-time analysis of any number of timeslots (up to 30 or 31, depending on the selected multiframing).