TPS2379, non-standard PoE with LLDP

Hirokazu Takahashi

Expert 8420 points

Other Parts Discussed in Thread: TPS2379, PMP7499, TPS23861, TPS2378

Dear Support team,

My customer is studying about PD of non-standard PoE like UPOE with LLDP.

They need 51W as PD.

In this case, can we proposal reference design of "PMP7499" with TPS2379 to customer?

http://www.ti.com/tool/pmp7499

I think that PD with LLDP needs to negotiate for over 25.5W with PSE.

The pmp7499 doesn't have any function for LLDP negotiation.

If customer will evaluate with pmp7499, can we provide any additional equipment, MCU board and software?

Can the PSE EVM as TPS23861 support non-standard PoE with LLDP negotiation?

Best regards,

Hiro Takahashi

over 10 years ago

0 Darwin Fernandez over 10 years ago

TI__Mastermind 40650 points

Takahashi-san,

It is not the function of the PD controller to communicate through LLDP to the PSE for high power. Instead, it is the load's software that must communicate through the data lines to the PSE.

You can demo the TPS23861 EVM to imitate this type of negotiation by using one of the two 4-pair connectors on the EVM and using the GUI to turn on one of ports after the other one detects and classifies the TPS2379. You can also change the current limit values in the GUI if more power is required.

If software is not desired, you can recommend the dual TPS2378 forced upoe design for 51W max at the input. See below link.

http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slva625&fileType=pdf

0 Hirokazu Takahashi over 10 years ago in reply to Darwin Fernandez

TI__Expert 8420 points

Dear Darwin-san

Thanks for your support.

I know that PD controller, TPS2379, does't have the function to communicate through LLDP.

I would like to confirm about 2 points below.

Q1. Can TPS23861EVM with MSP430 support non-standard PoE with LLDP?

Q2. If TPS23861EVM can do that, can we proposal total evaluation system like below?

PSE : TPS2386EVM+MSP430 --- PD : TPS2379EVM --- MSP430EVM

In this case, MSP430 in PSE communicates with other MSP430 connected to PD : TPS2379EVM.

As additional information, I have already suggest hard negtiation with dual TPS2378 for 51W.

But, Customer want to study non-standard PoE solution with LLDP.

Best regards,

Hiro Takahashi

0 Darwin Fernandez over 10 years ago in reply to Hirokazu Takahashi

TI__Mastermind 40650 points

Takahashi-san,

Yes, this solution would work.

0 Hirokazu Takahashi over 10 years ago in reply to Darwin Fernandez

TI__Expert 8420 points

Darwin-san

Thanks for your reply.

Do you have any MSP430EVM in side of PD and any software for it?

Best regards,

Hiro Takahashi

0 Darwin Fernandez over 10 years ago in reply to Hirokazu Takahashi

TI__Mastermind 40650 points

Yakahashi-san,

The PD itself does not support software nor does TI currently support software for LLDP. The customer will need to use their internal software team or use an external resource.

0 Hirokazu Takahashi over 10 years ago in reply to Darwin Fernandez

TI__Expert 8420 points

Darwin-san

Thanks for your reply and support.

Best regards,

Hiro Takahashi

0 Darwin Fernandez over 10 years ago in reply to Hirokazu Takahashi

TI__Mastermind 40650 points

Takahashi-san,

Below is a block diagram of a typical PoE solution at the PSE and PD ends. LLDP originates in the "Embedded Processor" blocks. The green blocks are the sections that we can support while the other blocks are for the end product software teams.

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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TPS2379, non-standard PoE with LLDP