
Standards and Specifications
Timing and Frequency References
Timing and Frequency References
Parameter | Nominal | Minimum | Maximum | Notes |
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Internal reference | 19.44 MHz | −4.6 ppm | +4.6 ppm | stratum 3 source |
frequency |
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External reference | 1 MHz | −25 Hz | +25 Hz |
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frequency |
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Recovered clock | fo | −25 Hz | +25 Hz | fo = port 1 or 2 interface |
frequency |
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| pod rate |
1.544 MHz | −25 ppm | +25 ppm | applied to BITS input | |
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| connector |
64 kHz | −25 ppm | +25 ppm | applied to BITS input | |
composite clock |
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| connector |
reference |
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E1 reference | 2.048 MHz | −25 ppm | +25 ppm | applied to BITS input |
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| connector |
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