When a Tekron clock loses GNSS synchronisation, the clock will move into a Holdover state for a period of time before moving into an Out of Sync state. The amount of time that the clock will remain in Holdover for is dependent on the oscillator type fitted in the clock and the “Enable Holdover Timeout” setting configured on the clock.
All of the current Tekron clocks are fitted with a TCXO oscillator as standard. However, there are a few products where the oscillator type may be upgraded, for example, the NTS 03-G+.
The table below defines the oscillator types fitted.
| Clock Model | Oscillator Type |
| TCG 01-G | TCXO |
| TCG 02-E / TCG 02-G |
TCXO VCTCXO OCXO Rubidium (Rb) |
| NTS 02-E / NTS 02-G | TCXO |
| NTS 03-E / NTS 03-G/-G+ |
TCXO OCXO Rubidium |
| TTM 01-G / PTP Translator | TCXO |
The different oscillator types that are fitted in Tekron clocks have their own unique holdover characteristics. Some oscillators have better holdover performance than others.
Please note the holdover characteristics for each oscillator detailed below.
|
Oscillator Type |
Drift Amount |
Time |
Operating temperature |
|
TCXO |
± 600 µs |
24 hours |
25°C |
|
VCTCXO |
± 600 µs |
24 hours |
25°C |
|
OCXO |
±10 µs |
24 hours |
25°C |
|
Rubidium |
±1 µs |
24 hours |
25°C |