Safran's CDM-7 clock distribution and timing reference module is a PCIe card that provides 10MHz and 1PPS signals for up to seven devices that need precise synchronization. The CDM-7 is ideal for PCIe-based Software-Defined Radios (SDR) installed in rack-mounted or desktop PCs, and can also be used for. Manuals and User Guides for Safran CDM-7. We have 1 Safran CDM-7 manual available for free PDF download: User Manual Safran CDM-7 Pdf User Manuals.