DP83822HF: fiber connection problem

GARETH OU

Part Number: DP83822HF

1.Could you help check the below DP83822 schematic and any need to adjust

2.Two SPS-3120Gs are connected as shown in the fiber connection photo below, the Link light is on, but the normal connection transmission cannot be performed

When switching the DP83822HF of this board from the Strap mode to the copper cable mode with a resistor, use two RJ-45 copper cables to connect, and the normal connection transmission is now possible

over 2 years ago

0 James Lee over 2 years ago

TI__Intellectual 2260 points

Gareth,

I am not seeing any schematic; At earliest convenience, could you send this over? Thanks!

Sincerely,

Jason Lee

0 James Lee over 2 years ago in reply to James Lee

TI__Intellectual 2260 points

Also, here is our DP83822 Schematic Checklist; Please go through this and let me know any further issues!

DP83822_ Schm_Checklist_StrapTool (1).xlsx

Sincerely,

Jason Lee

0 GARETH OU over 2 years ago in reply to James Lee

Guru 11365 points

Hi Jason

sorry, The schematic is as follows

DP83822H.pdf

0 James Lee over 2 years ago in reply to GARETH OU

TI__Intellectual 2260 points

Gareth,

Thanks for sending this over! When you have the opportunity, could you send over the completed checklist?

Sincerely,

Jason Lee

0 GARETH OU over 2 years ago in reply to James Lee

Guru 11365 points

Hi Jason

The optical fiber module SPS-3120G has no problem receiving the signal and transmitting it to DP83822F, and the packets can be transmitted normally. Use an oscilloscope to measure the RD_P and RD_M energy of DP83822F to the carrier signal, but there is a problem when DP83822F sends the signal to other optical fiber devices through SPS-3120G , The TD_P and TD_M of DP83822F can’t measure the signal with an oscilloscope. Is there any mechanism or reason for DP83822F that causes TD_P and TD_M to fail to send TX signals?

0 James Lee over 2 years ago in reply to GARETH OU

TI__Intellectual 2260 points

Gareth,

What MAC interface are you using? Also, have you tried performing loopback testing?

Sincerely,
Jason Lee

Interface

Interface forum

DP83822HF: fiber connection problem