The 5071A from Microchip Technology is a Time and Frequency Standard with Frequency 5 MHz, 10 MHz / 100 kHz and 1 MHz, Frequency Stability ±1 ppb, Phase Noise -154 to -100 dBc/Hz, Short Term Stability 0.00085 to 0.012 ppb, DC Supply 22 to 42 V. Tags: Rack mount, Frequency Standard. More details for 5071A can be seen below.