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| V |
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| V11 |
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See RS422 |
| VCO |
Voltage Controlled Oscillator |
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Voltage controlled oscillator normally used in the OSA equipment (e.g. BVA 8695, OCXO 8665, etc.). |
| W |
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| WAN |
Wide Area Network |
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| Wander |
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Long-term non-cumulative variations of the significant instants of a digital signal form their ideal positions in time, expressed in seconds or in UI (unit interval). |
| X |
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| X.25 |
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Communication protocol for levels 1 to 3 in a WAN. |
| X21 |
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Interface electrically compatible with V11/RS422. |
| XINMAX |
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XINMAX is the TOM threshold for phase error which can be programmed by the user to a value between 1 ns and 60 us. See also TOM above. |
| XO |
Crystal Oscillator |
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| Y |
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| y(t) |
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Fractional frequency offset, normalised instantaneous offset from a reference, in function of time. |
| YINMAX |
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YINMAX is the TOM threshold for detection of fractional frequency difference. YINMAX can be programmed by the user but is normally set to a value equal to the OCXO's pulling range. |
Oscilloquartz