DP83848I: Max Trace length bwtween Phy and Ethernet Jack

EASHWAR ARIVAZHAGAN

Part Number: DP83848I

Dear Sir/Madam,

In my enclosed system design, I can not keep the Ethernet jack connector on board next to PHY IC. So signals between PHY and Jack must pass through connector P/N - 5100147-1 (CPCI J1 connector) and get connected to Ethernet Jack placed on Back plane.

If this topology is acceptable, then what is the maximum trace length between PHY and Ethernet Jack?

If the above topology is not acceptable, then can I place the transformer on board close to PHY IC and as told ethernet jack on back plane? If Ok, the kindly let me know the routing guidelines.

Kindly provide your support.

Regards,

A Eashwar

over 4 years ago

0 Gerome Cacho over 4 years ago

TI__Mastermind 39855 points

Hello,

Your initial configuration would work, but as this configuration has not been characterized before, you would be responsible for the characterization of the performance of the system.

Sincerely,

Gerome

0 EASHWAR ARIVAZHAGAN over 4 years ago in reply to Gerome Cacho

Intellectual 315 points

Dear Gerome,

Yes you are right, we are also using this topology for first time. So I put PHY on my processor card and ethernet jack on the mother board. then what is max. trace length for TD+/- and RD+/-?

Regards,

A Eashwar

0 Gerome Cacho over 4 years ago in reply to EASHWAR ARIVAZHAGAN

TI__Mastermind 39855 points

Hi,

I am going to look into this. I expect a response by Friday.

Sincerely,

Gerome

0 Gerome Cacho over 4 years ago in reply to Gerome Cacho

TI__Mastermind 39855 points

Hello,

After talking with the team, our general recommendation for MDI trace lengths is 2 inches or less.

Sincerely,

Gerome

Interface

Interface forum

DP83848I: Max Trace length bwtween Phy and Ethernet Jack