The NFS-220 Pius from Brandywine Communications is a Time and Frequency Standard with Stability over Temperature 0.3 ppb, Output Power 13 dBm, Phase Noise -150 to -90 dBc/Hz, Short Term Stability 0.01 to 0.08 ppb. Tags: Rack Mount, Time & Frequency Standard. More details for NFS-220 Pius can be seen below.