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TLK10081: CTC for Multiple Devices

Art Mecina
Genius 16505 points
Part Number: TLK10081

Hello Guys,

Good day.

One of our customer wanted to connect 4-7 ethernet devices on TLK10081. He wanted to know if the device internal CTC (clock tolerance compensation) function will be able to take care of the individual ethernet device asynchronously/synchronously?

Thanks to confirm!

Art

  • 0
    TI__Mastermind 19135 points

    Related to: He wanted to know if the device internal CTC (clock tolerance compensation) function will be able to take care of the individual ethernet device asynchronously/synchronously?

    • I believe the customer is correct, given that each low speed data line has its own CTC FIFO

    Regards,

    Rodrigo Natal

    HSSC Applications Engineer

  • 0 in reply to Rodrigo Natal
    TI__Genius 16505 points

    Thanks Rodrigo!

    I will inform the customer of this and will let you know in case they have follow-up inquiries.

    Art

  • 0 in reply to Art Mecina
    TI__Genius 16505 points

    Hi Rodrigo,

    Below are the response from our customer. Appreciate your support on this.

    1) "So you can confirm that TLK10081 can transfer up to eight completely independent gigabit ethernet streams? And that there is no need to do any synchronization before - as the chip can do that on its own."

    2) "So I could use e.g. 8 media converter chips (PHYs) that convert 8 individual 1000 BASE-T RJ45 to serial and connect via one 10G fiber optic cable to a similar box on the opposite side - fully bidirectional and without any impact from one to the other GigE Link?"

    3) Do you have any reference design exactly for this setup? Or, to be more precise, do you have an RJ45/media converter breakout board for the existing TLK10081 reference design?

    4) Finally, I would also ask you about the life cycle of TLK10081 since it is available since 2013 - is the chip still preferred? 

    Thanks in advance!

    Art

  • 0 in reply to Art Mecina
    TI__Mastermind 19135 points

    Hi, see my inputs below:

    1) "So you can confirm that TLK10081 can transfer up to eight completely independent gigabit ethernet streams? And that there is no need to do any synchronization before - as the chip can do that on its own."

    • This is my understanding. System level testing is required to confirm it for your application

    2) "So I could use e.g. 8 media converter chips (PHYs) that convert 8 individual 1000 BASE-T RJ45 to serial and connect via one 10G fiber optic cable to a similar box on the opposite side - fully bidirectional and without any impact from one to the other GigE Link?"

    • No, I would not expect such an application case to work. The TLK chip is a simple link aggregator not a SerDes PHY. 10G Ethernet is 64B/66B encoded data, wile 1GE is 8B/10B encoded.

    3) Do you have any reference design exactly for this setup? Or, to be more precise, do you have an RJ45/media converter breakout board for the existing TLK10081 reference design?

    • No, we do not. We have EVM plus supporting collateral.

    4) Finally, I would also ask you about the life cycle of TLK10081 since it is available since 2013 - is the chip still preferred?

    • As I understand it this TI part number is still active and shipping in production

    Cordially,

    Rodrigo Natal

    HSSC Applications Engineer

  • 0 in reply to Rodrigo Natal
    TI__Genius 16505 points

    Thanks Rodrigo!

    I have relayed your answers to our customer. I might direct the customer to this thread in case he have further clarifications to explain his use case better.

    Art

  • 0 in reply to Art Mecina
    Prodigy 65 points

    Dear Rodrigo,

    thanks for being able to contact you directly.

    Could you please comment on my reply to Art this morning for a start.

    Best regards

    Philipp

    Dear Art, thanks for your answers, we just need to make sure to have a correct understanding before we start. Alas, I think you got question 2 wrong... Media converter chips like IP1103A from IC+ actually generate a 1.25G bitstream out of a 5PAM ethernet signal. Each media converter has exactly one 1.25G RX and one 1.25G TX bitstream - which should work with TLK10081. My question was referring to if it is better to run all media converters from one single clock (ensuring their clock is in phase) or they could also run from their own oscillators, which means all bitstreams are running at slightly different rates and do not have a fix phase relation. However, we would like to try out the chip with the demo kit - how do we get hold on a set? Ideally we would also need the SMA adaptor board to get started more quickly. Finally, arrow provided us with a direct contact to Nelson.Ong@ti.com and pengyu.song@ti.com. Are we talking to the same people in the background? Cheers Philipp

  • 0 in reply to Philipp Mittendorfer
    TI__Mastermind 19135 points

    Hi,

    My question was referring to if it is better to run all media converters from one single clock (ensuring their clock is in phase) or they could also run from their own oscillators, which means all bitstreams are running at slightly different rates and do not have a fix phase relation. 

    • These bit streams should have phase relation, so single clock is preferred

    We would like to try out the chip with the demo kit - how do we get hold on a set?

    Cordially,

    Rodrigo Natal

    HSSC Applications Engineer

  • 0 in reply to Rodrigo Natal
    Prodigy 65 points

    Dear Rodrigo,

    alas the request button for the DemoKit leads to a dead website.

    What can I do here?

    Cheers

    Philipp