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DP83TC811-Q1: signal strength vs. other T1 phys

Isee
Expert 5370 points
Part Number: DP83TC811-Q1
Other Parts Discussed in Thread: DP83TC811EVM

This request is not focused on TC811 only but more a general question

Are there differences in drive strengths between the different T1 PHYs we offer? 

Or is there possiblity to amplify the signal because they don`t need to meet the standard?

At longer cable lenghts customer notices a strong damping of communication channel

T1L isn not an option due to lower data-rate.

Is there a particular PHY that you would recommend?

Regards

Andreas

  • 0
    TI__Mastermind 19596 points

    Hi Andreas,

    All of our 100Base-T1 and 1000Base-T1 PHYs support cable length of 15m as defined by the IEEE specification. Switching PHYs would likely not provide an improvement. How long of a cable is required in your application?

    Regards,

    David

  • 0 in reply to David Creger
    TI__Expert 5370 points

    hi David,

    Need about 1.5m only but the damping is high due to a transformer being inbetween. Starting at 2m the damping is getting too high and communication breaks down.

    Regards

    Andreas

  • 0 in reply to Isee
    TI__Expert 5370 points

    The customer tested with DP83TC811S on a DP83TC811EVM.

    The primary side winding is a bit stretched which leads to a higher leakage inductance. 

    What they are doing is not a standard use-case - they can controll the sending and receiving side, also need to follow no standard.

    So is there a way to e.g. amplify the signal?

    thx!

  • 0 in reply to Isee
    TI__Mastermind 19596 points

    Hi Isee,

    Can you share a block diagram or image of the setup? What is the intention for placing transformer in between EVMs? 

    When you say "communication breaks down", does this mean bit errors or link drop?

    Would like to understand the application a bit better before recommending a path forward.

    Thanks,

    David