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Abnormal Signal in Auto-negotiation process from Home Hub using Quacomm PHY
lawrence1
Join Date: 2 May 24
Posts: 1
Posted: Tue, 2024-05-14 02:32
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Hi, I am using Home ethernet Hub (Linksys MR7350 with Qualcomm PHY IPQ4018) 

During Test with embedded IoT devices, I found Auto-Negotiation fail.

When I try to figure out the reason, I measure PHY TX/RX signals from Linksys side.

Then I found an Abnormal Signal from Linksys before Auto-Negotiation done.

Usually, during send and receive FLP for Auto-MDIX & Auto-Negotiation, there is no Data signal.

But the wave looks like Data signal and Linksys outputs it.

(Abnormal signal detected from Linksys hub)

https://www.dropbox.com/scl/fi/rnu7emv9oj1ihcaeqbihd/qualcomm-phy-wave-1.png?rlkey=qsdf7aormb59o2i8tckvrjr4d&st=moi096o9&dl=0

(Auto-Negotiation works but embedded PHY do not send any ACK in FLP)

https://www.dropbox.com/scl/fi/d49aw8py005gmc97fkglb/qualcomm-phy-wave-2.png?rlkey=ju6bzmhra6w873chywmx6oc5u&st=yasxgj1d&dl=0

https://www.dropbox.com/scl/fi/77e8var5o9p873l905enw/qualcomm-phy-wave-3.png?rlkey=dtg4tnlxlc7b5pcvgwrrldbrr&st=q13rbhk9&dl=0

Most embedded Devices has Link-up with the abnormal signal.

But few devices cannot Link-up on Auto-Negotiation mode.

Is there any reasom why I detected the Data signal from Qualcomm PHY?

Is it any other algorithm for Auto-MDIX or FLP process ?

 

You can check the whole post in Reddit too.
https://www.reddit.com/user/StrainVisual3979/comments/1ct6ttj/the_abnormal_signal_detected_during/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

 

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