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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1279777/faq-dp83826i-how-do-i-debug-a-phy-issue-within-an-ethercat-network
e2e.ti.com/.../3644.How-to-debug-PHY-level-issues-in-EtherCAT-networks.pdf
