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What role does SerDes PLL play in transceiver?

Hi all,

   I have confused  about SerDes PLL in transceiver,I used to think that if the SerDes PLL got unocked, the transceiver would not establish the link successfully.But it is not in fact.

From the initialization log of transceiver,the serdes pll of JRX is unlocked and JTX is locked,the transceiver established the link well by the end.So what role does SerDes PLL play in transceiver or how does it work in transceiver?

Regards.