Cadence began aggressively bundling the Allegro layout engine ( .BRD files) with OrCAD. This introduced mainstream users to high-speed design features, constraint managers, and advanced shape editing. The Persistent Challenges of Version 15.7 Today
If you are looking for a "solid" or comprehensive status report from your design, here are the primary reports you should generate in OrCAD 15.7: Design Rule Check (DRC): cadence orcad 15.7
Do you need help 15.7 files to a newer EDA tool? cadence orcad 15.7
While modern versions of OrCAD (like 17.2 and 17.4) offer advanced high-speed design features, version 15.7 retained a massive user base for specific reasons: cadence orcad 15.7