Mean Time Between Failures (MTBF)
Mean Time Between Failures (MTBF) is a common way of measuring the reliability of a product. We calculate MTBF based on Telcordia SR-332, Issue 3.
Network Time Server
(25C Ambient / Ground Benign)
| Model | Options | Hours | Years |
| Sonoma D12* (GPS / CDMA) | None | 269,000 | 31 |
| Sonoma D12* (GPS / CDMA) | OCXO | 235,000 | 27 |
| Sonoma D12* (GPS / CDMA) | Rubidium | 138,000 | 16 |
* MTBF for Sonoma N12 without a front-panel display is even better.
PTP Grandmaster
(25C Ambient / Ground Benign)
| Model | Options | Hours | Years |
| Sonoma D12 | OCXO | 235,000 | 27 |
| Sonoma D12 | Rubidium | 138,000 | 16 |
| Meridian II | OCXO | 235,000 | 27 |
Precision TimeBase
(25C Ambient / Ground Benign)
| Model | Options | Hours | Years |
| Meridian II* | None | 265,000 | 30 |
| Meridian II* | OCXO & four 10 MHz | 227,000 | 26 |
* MTBF for Tycho II without a front-panel display is even better.
Distribution Chassis (e-Series)
(25C Ambient / Ground Benign)
| Model | Options | Hours | Years |
| All models | None | 263,491 | 30 |
| All models | Dual AC/AC | 197,660 | 23 |
