The NY Fed Payments Risk Committee (PRC) have published a paper giving guidance to users of CCPs, referencing the CPSS / ISCO standards. It's 48 pages, so will need a while to read, you can find it via the link below, or download here: report_130205 Payments Risk Committee – Federal Reserve Bank of New York. Also see: http://www.ft.com/cms/s/0/c1848d9a-6fa7-11e2-8785-00144feab49a.html (subscription)