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G.8266 Tone Frequencies for Tolerance and Transfer
The following table tables proposes the tone frequencies and amplitudes to be applied at the input, the attenuation due to the filter, and the tone amplitude expected at the output.
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The lowest tone frequency specified in Table 13 of G.812 is 0.000012Hz (12µHz), which has a period of over 23 hours. However, the longest observation interval specified in the MTIE mask (Figure 3) is 10000s, equivalent to a tone frequency of 0.000032Hz (32µHz). Therefore it is sufficient to make this the lowest tone frequency in the test, reducing the overall test time from 36 hours to about 13 hours.
Table 1: Tone Frequencies for G.8266 Type I Clocks
The parameters used to generate this table were:
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Frequency (Hz) | Amplitude (ns) | Test Time (Cycles) | Test Time (s) | Max. Gain (dB) | Max. Output Amplitude (ns) |
1 | 750 | 300 | 300 | -50.5 | 38 |
0.32 | 750 | 96 | 300 | -40.6 | 43 |
0.01 | 750 | 30 | 300 | -10.8 | 251 |
0.043 | 750 | 13 | 302 | -23.1 | 88 |
0.032 | 1000 | 10 | 313 | -20.6 | 129 |
0.016 | 2000 | 5 | 313 | -14.7 | 404 |
0.01 | 2000 | 3 | 300 | -10.8 | 610 |
0.0032 | 2000 | 3 | 938 | -3.3 | 1403 |
0.0008 | 2000 | 1 | 1250 | 0.2 | 2082 |
0.00032 | 5000 | 1 | 3125 | 0.2 | 5152 |
0.0001 | 5000 | 1 | 10000 | 0.2 | 5152 |
0.000032 | 5000 | 1 | 31250 | 0.2 | 5152 |
The filtering characteristic expected from the clock is shown in the following diagram. While there is no minimum gain specified, the frequency response is expected to be fairly close to the maximum.
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Tone Frequencies for G.8266 Type II and Type III Clocks
The parameters used to generate this table were:
Maximum bandwidth: 1mHz
Minimum bandwidth: none
Maximum gain peaking: 0.2dB
Noise generation allowance: ±35ns
(half the peak-to-peak high-frequency time error defined in clause 8.2)At least two points per decade
Frequency (Hz) | Amplitude (ns) | Test Time (Cycles) | Test Time (s) | Max. Gain (dB) | Max. Output Amplitude (ns) |
4 | 300 | 1200 | 300 | -72.0 | 36 |
1.26 | 301 | 377 | 300 | -62.0 | 36 |
0.4 | 303 | 120 | 300 | -52.0 | 36 |
0.126 | 308 | 38 | 302 | -42.0 | 38 |
0.04 | 325 | 12 | 300 | -32.0 | 44 |
0.0126 | 380 | 4 | 318 | -22.0 | 66 |
0.004 | 550 | 3 | 750 | -12.3 | 169 |
0.00143 | 1000 | 3 | 2100 | -4.8 | 609 |
0.0004 | 1007 | 1 | 2500 | 0.2 | 1066 |
0.000126 | 1029 | 1 | 7950 | 0.2 | 1088 |
0.00004 | 1097 | 1 | 25000 | 0.2 | 1158 |
The filtering characteristic expected from the clock is shown in the following diagram. While there is no minimum gain specified, the frequency response is expected to be fairly close to the maximum.
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