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DS280BR810: The difference between DS280BR810 and DS280MB810

Rannie Zhou
Expert 4160 points
Part Number: DS280BR810
Other Parts Discussed in Thread: DS280MB810, DS280BR820,

Tool/software:

Hi expert,

My customer meet an issue with DS280MB810.

The background is: My customer design, like that of their competitor, uses the redriver to route the XGE signal from the Kunpeng 920 (CPU) directly to the optical module. However, they are having trouble getting the XGE link up, while their competitor's works fine.

The hardware difference is that the redriver my customer used is the DS280MB810, while their competitor's is the DS280RB810ZB.

So, I would like to ask: What's the difference in the redriver functionality between the DS280MB810 and DS280BR810? Is that a possible reason for the link failed issue?

BRs,

Rannie

  • 0
    TI__Mastermind 36173 points

    Hi Rannie,

    These devices are pretty similar.  A few key differences:

    - DS280MB810 does not have AC coupling capacitors on TX.  We actually expect this to improve performance relative to DS280BR810 since this difference is also the key difference between DS280BR810 and DS280BR820.

    - DS280MB810 just has a linear signal chain, while DS280BR810 has linear signal and limiting signal chain with TX FIR.  Depending on the channel, a limiting signal chain could be advantageous.

    - DS280MB810 has crosspoint

    Questions:

    - Has your customer tuned the CTLE on the DS280MB810?

    - Has your customer taken any eye measurements at the SFP port?

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    TI__Expert 4160 points

    Hi Drew,

    Could you please help to elaborate how to adjust the CTLE? in which direction?

    BRs,

    Rannie

  • 0 in reply to Rannie Zhou
    TI__Mastermind 36173 points

    Hi Rannie,

    Typically CTLE indexes are iterated through to identify the setting with the optimal eye diagram or BER.

    The procedure to adjust the CTLE is detailed in the "Adjust Equalization Level" section of the programming guide.

    Thanks,

    Drew