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DP83TG720S-Q1: 1000BaseT1 type B

Dan Kraus
Prodigy 10 points
Part Number: DP83TG720S-Q1

Is 1000Base-T1 type B already addressed by TI (40m cable)? '  Is this “type B” support already available in TI PHYs?   Ie. are existing PHYs capable of such operation (ie. 720 or 721 PHYs) ?

  • 0
    TI__Mastermind 19150 points

    Hi Dan,

    Thank you for getting in touch with us.

    1000Base-T1 is neither qualified nor tested with typeB.

    However, we have observed that we are able to achieve 40m cable reach with shielded twisted pair cable.
    You can qualify your system with 40m STP in case you are okay with it.

    Please let me know if you need more details.

    --
    Regards,
    Gokul.

  • 0 in reply to Gokul Koraganji
    Prodigy 10 points

    Hi Gokul

    Type B is specified in IEEE 802.3 clause 97.6.2 for 1000Base-T1, so how do you exactly mean "1000Base-T1 is neither qualified nor tested with typeB." ?    Ie. you mean your PHYs are not qualified/tested for type B ?  

    When you're referring that your are able to achieve 40m, pls. to what PHYs is this information relevant?  Do you have any more details/papers on that that would let us asses if this is viable approach for series application? 

    Many thanks

    Regards

    Daniel

  • 0 in reply to Dan Kraus
    TI__Mastermind 19150 points

    Hi Dan,

    Yes, our product DP83TG720 is not tested with type B cable. It is tested and qualified only for type A cable.

    We have done some preliminary testing with DP83TG720 and 40m STP cable, and have seen good performance. However, we have not qualified it for the 40m performance. If you are okay with using 40m STP cable, you can qualify the device in your system.

    --
    Regards,
    Gokul.

  • +1 in reply to Gokul Koraganji
    Prodigy 10 points

    Hi Gokul

    Do you have any plans for future to officially support type B?  Ie. with other PHYs like 721?

    For 720 - do you have any test report or anything disclosing more details what you did and how? .....so we don't have to reinvent the wheel  :-)

    I was also wondering if you can say what would make a PHY type B compliant?  I.e.  assuming we have in our control only one side of the link and other end is some unknown ECU with unknown PHY, only claiming that it is "type B" compliant. What would you suggest that has to be done on our side of the link to be able to say that we're "type B" compliant? 

    Many thanks

    Daniel

  • 0 in reply to Dan Kraus
    TI__Mastermind 19150 points

    Hi Dan,

    We currently don't have a plan of officially supporting type B.

    For 720, no qualification tests are run for 40m cable reach and hence no tests reports are available. Some inhouse validation showed that we can support 40m STP.

    For testing type B compliance on your side, I suggest running the following tests.

    1. IOP tests (specifically the linkup and linkup timing tests)
    2. EMC tests (acc. to your required specification)

    --
    Regards,
    Gokul.