DP83TD510E: Question about Signal Quality Indicator(SQI)

Hidenori Shiraki

Part Number: DP83TD510E

Hello,

I have a question about DP83TD510E Signal Quality Indicator.

I have refered to both the data sheet of DP83TD510E and Application Report "DP83TD510E Cable Diagnostics Toolkit", and hope understanding it further.

The accumulation of mean-square error (MSE) is for those ternaly symbols ("-1","0","+1" ) during valid communication?

In the case 7.5MS/s ternaly symbol is marginal for identification ("-1" or "0" or "+1" ) , then the value become worse?

Or inserting a test signal for testing?

Or the number of invalid triple ternary symbol?

When the SQI shows the health of active link is "Good", even if the Return Loss does not meet the Link Segment requirement (>13dB @0.5<f<20MHz) ,

the link can keep working normally? as

Thanks.

0 Kallikuppa Sreenivasa over 4 years ago

Thank you for the query. The use case is provided in the below document.

4 Signal Quality Indicator 4.1 Application Need

What is the use case for the additional information. Is there some issue that you are facing. Please share details.

The implementations are typically driven by standards.

Regards,

Sreenivasa

0 Hidenori Shiraki over 4 years ago in reply to Kallikuppa Sreenivasa

Hi Sreenivasa，

The application does not requre to reach so long distance, 15m would be enough in the application I'm thinking of.

(but it does not requre 100BASE, 10BASE is enough)

But the cable is not ideal, the cable is not the special cable for IEEE802.3cg, 10BASE-T1L.

Therefore it can not avoid a certain level of return loss, cannot meet the standard.

Just like "4.1 Characteristic Impedance" in the application note below,

To accomodate the application the termination resistor needs to be adjuested.

But the caractaristic of the cable would varies,

even if adjusting the termination resister, it's difficult to fulfill the return loss requirement all the time,

and wondering if SQI helps evaluate the health of the link in this case.

Thanks!

+1 Kallikuppa Sreenivasa over 4 years ago in reply to Hidenori Shiraki

This should be fine.

Please refer to the link for additional info,

Regards,

Sreenivasa