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DP83848Q-Q1: Does it generate 30kHz clock inside the IC for some purposes?

Part Number: DP83848Q-Q1

When we measure Tx and Rx lines by a spectrumanalyzer, a lot of harmonics of 30kHz are observed from around 20MHz to around 100MHz.

Does it generate 30kHz clock inside the IC for some purposes?

(DC/DC switching frequency supplied to the IC is 1MHz)