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Link integrity problem with Ethernet transceiver -TLK105L

Anil Sharma1
Prodigy 60 points
Other Parts Discussed in Thread: TLK105L

Hi,

We have designed the board with TLK105L.

We are unable to make this board compatible(link integrity fail) to other Ethernet board.

Our board with TLK105L is failed in link integrity (LED does not glow) with following board/device.

1. Surecom Nway Switch    - device used - Realtek   RTL8309SC

2. Valiant's   TDMOIP  - device used Marvell 88E6065B-XX-LAJ1I00    

3. Valiant TDMOIP      - device used Broadcom  BCM5387KFBG and BCM5464RA1KFBG

Our board with TLK105L is success fully(Integrity LED glows) working with following system.

1. Tried with 3 PCs - ok.

2. Surecom Hub EP608 -ok

3. Surecom Switch 5port 10/100 Mbps  -ok

What could be probably reason behind the intermittent behaviour of our design.

Please note that we are using the Ethernet transceiver in Default mode.

We are attaching the schematic diagram for your reference.

Please help us out asap as our shipment is stuck up due to this problem.

In past we have used many Ethernet transceiver and switch like. Intel- LXT971, micrel KSZ8995xa etc.

We have never experience this problem with those devices   

Thanks

Anil Sharma

Softech Consultants

Mobile 9818421003

  • 0
    TI__Intellectual 1500 points

    Hi Anil,

    Can you please re-attach the schematic?
    I can't see it attached.
    First phase for debug would be to review the schematic.

    Thanks,
    Noam

  • 0 in reply to Noam Sadan
    Prodigy 60 points

    Hi Noam,

    We could finally locate the problem.

    In one of the your application note "slva531a_layout", a 100nF capacitor is shown parallel to the

    Rbias(4.87KR) resistor. Although after showing the capacitor, IGNORE was mentioned.

    We have assembled the PCB with 100nF capacitor.

    When we removed the capacitor, every thing become ok.

    Now our Ethernet card is working with all other Ethernet physical devices/switches.

    You may close this issue.

    Thanks.

    Regards,

    Anil Sharma

    Softech Consultants

    Mobile:+91-9818421003 

  • 0 in reply to Anil Sharma1
    TI__Intellectual 1500 points

    Hi Anil,

    Thanks for the update! I'm glad everything works fine now.
    As you wrote, the parallel capacitor to the RBIAS resistor should be ignored and not connected on most of the applications.
    We will update the document to remove it from schematic and avoid confusions.

    Thanks,
    Noam