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DS125DF1610: System architecture with DS125DF1610

Shaka Lee
Intellectual 835 points
Part Number: DS125DF1610
Other Parts Discussed in Thread: DS125BR820, DS280MB810

Hello TI,

Please let me have answer for below questions about DS125DF1610.

My customer is going to build OLT system as below block. They are going to build below 100G Card and Switch Card1/2. Their concern point is existing 10G Card which doesn't have retimer inside.

Questions.

1. Is there any problem on 10G Card for 10G-KR traffic?

2. Is there any issue for 10G KR Auto-Negotiation between 10G Phy and Main Switch which has only 1 Retimer on Main Switch? This needs to be done initialization on 10G Card.

3. Please let me know exact meaning of 'Non-blocking' in datasheet as below.

'Each quad has a 4x4 non-blocking analog cross point switch'

Best regards,

Shaka

  • 0
    TI__Guru* 93570 points
    Hi Lee,

    DS125DF1610 does not allow 10G-KR training to go through. Please take a look at DS125BR820 or DS280MB810 devices instead to see which parts meets your overall system requirements.

    Non-blocking means you can connect any input to any output. One connection path does not block any other connection path.

    Regards,,,nasser
  • 0 in reply to Nasser Mohammadi
    Intellectual 835 points
    Hi Nasser,

    Thank you for your answer. Few more questions for DS125BR820.

    1. When we use DS125BR820 instead of DS125DF1610 on the block diagram, there is only 1 Retimer on Switch Card 2 but there is no Retimer on 10G Card. It means only 1 path has retimer. Is there any issue for 10G-KR?

    2. Does DS125BR820 support 1000BASE-X (SGMII, 1GbE) and 2.5GbE (2.5G SerDes)? I couldn't find them on datasheet.

    3. Is there 16 channel Retimer?

    Best regards,
    Shaka
  • 0 in reply to Shaka Lee
    TI__Guru* 93570 points
    Hi Shaka,
    1). I believe this depends on your overall system jitter tolerance. It would be a good idea to model your line card pcb, backplane, connectors and then short trace to DS125BR820. This would help to see if the eye opening at the output of the DS125BR820 meets your system overall jitter tolerance/eye opening. You can request IBIS-AMI model for DS125MB820 at the following link:
    www.ti.com/.../snlm143.pdf
    2). DS125BR820 is just a signal conditioner and thus does not provide any SerDes functionality. Using IBIS-AMI model you can observe DS125BR820 signal conditioning at these lower rates.
    3). DS125DF1610 is the only 16 channels retime. However, this device does not pass through KR-link training seamlessly.
    Regards,,nasser