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TLK10002: About SLVS-EC signal extender using TLK10002 and SFP+

yutaka takasaki
Prodigy 10 points
Part Number: TLK10002

I am considering an SLVS-EC signal extension circuit using TLK10002 and SFP+.

The electrical signal of SFP+ (10Gbps) is CML and NRZ.

The input level of TLK10002 can receive SLVS-EC (5Gbps) signals.

I don't think there will be any electrical problems if you use these.

Please let me know if there are any problems with the protocol.

  • 0
    TI__Mastermind 28110 points

    Hi,

    I think using a redriver or retimer to improve signal quality may be a much simpler solution for reach extension than using TLK10002 with SFP+ modules. Our retimers/redrivers are typically much simpler to implement than our TLK transceivers/aggregators, have smaller packages, and are lower cost. Is SLVS-EC (5 Gbps) aggregation to SFP+ (10 Gbps) a requirement for your system? Or are you open to simply improving signal quality on 5 Gbps SLVS-EC channels to extend reach?

    Best,

    Lucas

  • 0 in reply to Lucas Wolter
    Prodigy 10 points
    Hi, Lucas.

    Good day!!

    Thank you for your valuable comments.

    The system requirement is to use TLK10002 and SFP+ module.
    The communication distance is approximately 30m, and the purpose is to reduce the weight of the coaxial cable.

    The best way is to connect to an FPGA and use 10GBASE-SX(LX).
    However, this method deviates from system requirements.

    Best,

    Yutaka

  • 0 in reply to yutaka takasaki
    Prodigy 10 points

    Hi, Lucas.

    FPGA cannot be implemented as a system requirement
    Specifically, the following configurations are possible.

    Senser(SLVSEC_Tx_5Gx16Lane)→TLK10002(x4)→QSFP_TX_40G(x4)→Optical(30m)→QSFP_Rx_40G(x4)→TLK10002(x4)→(SLVS-EC_Rx_16Lane)

    Best,

    Yutaka

  • 0 in reply to yutaka takasaki
    TI__Mastermind 28110 points

    Hi Yutaka,

    Thank you for the clarifications about your system requirements. Note that I am not an expert on SLVS-EC and TLK10002 was not designed to support this interface. Despite this, I think it may be possible to use TLK10002 in this application.

    This is my understanding of SLVS-EC. I understand you are using a data rate of 5 Gbps. Please let me know if any information is incorrect or missing.

    Since SLVS-EC is 8b/10b encoded and has 100 ohm differential termination, I believe it can work with TLK10002. Note that LS inputs will need to be AC coupled externally to remove common mode voltage. Note that LS outputs will need to be AC coupled externally and connected to a termination network to add the 200mV common mode voltage back to the signals.

    Best,

    Lucas

  • +1 in reply to Lucas Wolter
    Prodigy 10 points

    Hi, Lucas.

    good day!!

    Sorry, I seem to have written the quantity of each part incorrectly. The following is correct.

    Senser(SLVSEC_Tx_5Gx16Lane)→TLK10002(x8)→QSFP_TX_40G(x2)→Optical(30m)→QSFP_Rx_40G(x2)→TLK10002(x8)→(SLVS-EC_Rx_16Lane)

    AC coupling is used for all signals.
    I also intend to use 0.1uF as stated on the evaluation board.

    We sincerely appreciate your response.

    Best,

    Yutaka

  • 0 in reply to yutaka takasaki
    Prodigy 10 points

    Senser(SLVSEC_Tx_5Gx16Lane)→TLK10002(x4)→QSFP_TX_40G(x2)→Optical(30m)→QSFP_Rx_40G(x2)→TLK10002(x4)→(SLVS-EC_Rx_16Lane)

    The LK10002 has two internal functional blocks.

  • 0 in reply to yutaka takasaki
    TI__Mastermind 28110 points

    Hi Yutaka,

    Thank you for the clarification.

    I thought of one more thing you should look out for. Make sure your QSFP modules support 10 Gbps data rate. This is different from 10 GbE which is 64b/66b encoded and runs at a line rate of 10.3125 Gbps.

    Best,

    Lucas

  • 0 in reply to Lucas Wolter
    Prodigy 10 points

    Hi, Lucas.

    good day!!

    I am grateful to you.


    I have already developed an optical module in my company that operates at multi-rate in the NRZ from 1 Gbps to 32 Gbps. And PRBS signals operate from 7 to 31.

    I am happy if the TLK10002 can be used as envisaged.

    Best,

    Yutaka

  • 0 in reply to yutaka takasaki
    TI__Mastermind 28110 points

    Hi Yutaka,

    Great, thank you for the confirmation!

    Best,

    Lucas