CCS/DS100DF410: CDR cannot be locked

Hi  

1. At present, it is found that the CDR cannot be locked by repeatedly plugging and unplugging the MPO interface fiber, causing the interface to lose packets. Close and open the CDR interface again to communicate normally without packet loss. Please help me look at this problem. Is there any configuration to solve this problem? ?
2. Can the bypass function be used when using 10g? ? How to configure, if you only turn off the fifth bit of 0x09 and change it to 1, it is to enable this function, but if I configure it, the port cannot be up. Is there a configuration sequence, or this function cannot be enabled in 10g mode? ?


Please let me know if you have any questions.

Thank you very much for providing the solution. At present, mandatory CTLE can solve the problem. I have a question that our design also includes RX plus retimer, so packet loss will not occur in the same configuration.The only difference is that the wire length is different. Is there any requirement for the wire length to be increased by RX retimer?

Hi Rodrigo

Thank for your reply, could please help to follow up next question？

Can you clarify what you mean by wire length? What is the retimer input channel insertion loss for each of your application cases?

Thanks,

Rodrigo Natal

RX plus retimer if there was any constraints, SFI (SFP +) walk line length, now I have two projects, is RX increased the retimer, configuration as another project board plug will be lost package, according to the method of you provide close CTLE will solve the problem, but two different design are increased retimer configuration, one must be closed CTLE in order to solve the problem of plug lost package

Hi,

My apologies, but I still don't understand what the issue is. Can you provide more detailed explanation, and if possible include customer system block diagrams for all retimer use cases?

Cordially,

Rodrigo Natal

HSSC Applications Engineer

retimer 拓扑.doc

I have uploaded a topology. The difference between the two designs is that the switching chip is different, and the length of the wire between the switching chip and the Retimer is inconsistent.The configuration parameters of the Rx Retimer are the same.

Ok, thank you very much