This is a cesium-beam primary standard oscillator/clock with long-term stability better than 7x10^-13 (about 60 ns per day). It produces various outputs which can be used by the UTC to provide a precise frequency and time reference when used in conjunction with a timecode receiver. Used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond even after all contact with a reference source has been lost well over the expected life of the beam tube, which is about ten years.

This is a rubidium-vapor resonance cell secondary standard oscillator/clock with long-term stability better than 2x10^-12 (about 170 ns per day). It produces various outputs which can be used to provide a precise frequency and time reference when used in conjunction with the UTC timecode receiver. Used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond even after all contact with a reference source has been lost well over a year.
“Table 1-2, Synchros Clocks” on page 5.
Used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond even after all contact with a reference source has been lost over three months. This is an oven-stabilized synthetic oscillator with stability better than 1x8^-10 (about 7 us per day). It produces various outputs which can be used to provide a precise frequency reference when used in conjunction with a timecode receiver.
A micro-stabilized quartz oscillator with stability better than 1x10^-8 (about 0.9 ms per day) is the most common. It produces a 5-MHz output which can be used to provide a precise frequency reference when used in conjunction with a timecode receiver. The UTC used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond even after all contact with a reference source has been lost over one day.
This is an oven-stabilized quartz oscillator with stability better than 1x10^-10 (about 9 us per day). It produces various outputs UTC which can be used to provide a precise frequency reference when used in conjunction with a timecode receiver. Used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond even after all contact with a reference source has been lost over three months.
It produces a 5-MHz output which can be used to provide a precise frequency reference when used in conjunction with a timecode receiver. Used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond even after all contact with a reference source has been lost over one day.
This is an oven-stabilized quartz oscillator available in three grades: 1x10^-9, 1x10^-10 or 5x10^-11 per day (equivalent to about 90 us, 9 us or 4 us per day, respectively). Used to stabilize frequency with the NTP local-clock algorithms, a time server will ensure accuracy to a millisecond UTC even after all contact with a reference source has been lost over 10 days, 3 months or 6 months.
This is a LORAN-C receiver with stability and accuracy determined by the propagation characteristics of the LORAN-C signal. It produces various outputs which can be used to provide a precise frequency and time reference when used in conjunction with a timecode receiver. When used with domestic U.S. LORAN-C chains, it provides accuracies in the order of 100 ns.