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MDIO addressing

When using a configuration as in figure 46-1, how does one address the
individual PCSs (the PCS of the DTE-XS, the PCS of the PHY-XS and the PCS of
the "PHY" device going to the optics).

Given that each PCS could be configured in a different fashion in each
device, how is this handled within the Management Interface?

Also, what does the PCS device #3 in Table 45-1 refer to?
Which of the PCSs (referring to figure 46-1) does it comprise?

Stefan Wurster
Dir. Engineering
TDK Semiconductor