The PULSE network remains the key driver of payments transaction volume for Discover Financial Services (DFS), growing 5% year-on-year (Y/Y) in the first quarter (Q1/2014) to $41.9 billion, representing 54% of Discover’s network total volume. Overall, DFS’ network volume is up 4% Y/Y to $77.38 billion. The most robust payments business for DFS is its Network Partners segment, up 6% Y/Y in Q1/2014, followed by the Proprietary segment, up 3%. However, DFS continues to struggle with its Diners Club international segment, which slipped down 2% Y/Y in Q1/2014.