Colleagues, Can someone give me a lay mans explanation of each of the lines of output from my ntpdc -c kern command please? [root@tock /usr/local/etc]# ntpdc -c kern pll offset: 8e-07 s pll frequency: -2.289 ppm maximum error: 0.006736 s estimated error: 1e-06 s status: 2107 pll ppsfreq ppstime ppssignal nano pll time constant: 4 precision: 1e-09 s frequency tolerance: 496 ppm pps frequency: -2.289 ppm pps stability: 0.011 ppm pps jitter: 1.564e-06 s calibration interval: 256 s calibration cycles: 1646 jitter exceeded: 345 stability exceeded: 1 calibration errors: 1 [root@tock /usr/local/etc]# Thanks! Ron -- Ron Hahn, EI2JP Rosslare Strand, County Wexford, Ireland