| Optional Crystal Oscillators | |||
| Crystal Freq. (MHz) | Uniphase (MHz) | Biphase (MHz) | Part Number |
| 20 | 10 | 20 | 309 040 020 |
| 32 | 16 | 32 | 309 040 032 |
| 40 | 20 | 40 | 309 040 040 |
| 50 | 25 | 50 | 309 040 050 |
| 62.5 | 31.25 | 62.5 | 309 040 062 |
| 70 | 35 | 70 | 309 040 070 |
| 80* | 40* | 80* | 309 040 080 |
| *Factory Supplied | |||