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DS92LX1621: About AC coupling capacitors

Part Number: DS92LX1621

Hello team,

Our customer is interested in DS92LX1621/2 and has inquiries about it. Inquiries are as below.

1) Is the coupling capacitor necessary on both the serializer and deserializer sides?

2) They plan to use a connector to connect the serializer and deserializer.  Should the coupling capacitor be placed near the serializer or deserializer, or near the connector?

3) When connecting a serializer or deserializer to an SFP module, is a coupling capacitor necessary between them?
*There is a coupling capacitor in the SPF module.

Regards,

Masakazu