Questions › Category: Optical Transceiver › How does the SERDES interface on SFPP-T cope with auto negotiaion on the 10GBASE-T interface?
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Ludvig Vidlid asked 6 years ago

Hi,
I have a question regarding SFPP-T, but it is probably relevant for all your 10GBASE-T SFP+ modules.

  1. Because SFPP-T supports 10GBASE-T, it also auto-negotiaties with its partner (by Clause 28). Does this mean that it can negotiate to run at a lower speed, for example 1000BASE-T?
  2. Because SFPP-T is compliant with SFF-8431 MSA, the SERDES interface (running e.g. 10GBASE-R) has no auto-negotiation. Is this correct?
  3. If 2 and 3 are true a transmission may cause data to be pushed to SFPP-T ten times faster than it can be sent on the twisted wire. Is there any way to make sure that data isn’t lost?

 
Thanks in advance!
Ludvig

1 Answers
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Cosmo17 Staff answered 6 years ago

Thanks for your question.

  1. Yes, it supports auto-negotiation
  2. That’s right
  3. Please make sure they with the same rate on the transmit and receive side of the twisted wire