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4.5.2 Modulation
The modulation employed shall be 2-level FSK shaped by an approximately Gaussian filter to meet the requirements of subclause 4.5.5. The peak frequency deviation under all possible data patterns shall lie between 14,4 kHz and 25,2 kHz.
A binary 1 shall be encoded as a frequency higher than the carrier frequency (fc+ f); a binary 0 shall be encoded as a frequency lower than the carrier frequency (fc - f). fc is the RF carrier frequency and f is the deviation.
5.1.1 Data rate
The nominal data rate shall be 72 kbit/s with a tolerance of ± 50 ppm at the CPP and ± 50 ppm at the CFP. The data clock may have drift and jitter up to the limits specified for the CCITT Recommendation G.823 [2] table 1, 64 kbit/s interface, but this does not override the long term frequency accuracy specified above.
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