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DS250DF810: High speed 10G/25G signal delay consultation

Vayne Li
Intellectual 980 points
Part Number: DS250DF810
Other Parts Discussed in Thread: DS250DF230

Tool/software:

Hi Teams,

Customer uses DS250DF810ABVT and DS250DF230ZLST produces base station products,

and now there are two questions they want to confirm：

1.What is the delay of a signal passing through a retimer at high speeds of 10G/25G.

2.Does the eCRPI signal (with 1588 protocol) pass through the retimer and repeater, and have any impact on the 1588 timing?

  • 0
    TI__Mastermind 36153 points

    Hi Vayne,

    1. This is captured in the data sheet propagation delay specification:

    DS250DF810

    DS250DF230

    2. We would not expect any issues passing 1588 through the retimer.  1588 accounts for propagation delay through the network signal chain.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Intellectual 980 points

    Hi Drew,

    Thank you for your reply,

    There are a few more questions they would like to add

    1.Can the retimer be cascaded multiple times when the length is very long?

    2.Can the 25Gbps length be obtained by dividing this 35dB by the insertion loss per inch of the PCB?

  • +1 in reply to Vayne Li
    TI__Mastermind 36153 points

    Hi Vayne,

    1. Yes, the retimer can be cascaded multiple times in order to increase the length of a channel.
    2. Yes, you can calculate maximum length by doing this.  You might consider adding some margin, especially if going through connectors since these can cause reflections.

    Thanks,

    Drew