MDIO Physical Port Addresses. These control pins are used for the system to address all of the CFP2 ports contained within a host system. PRTADR0 corresponds to the LSB in the physical port addressing scheme. The 3-wire Physical Port 3 The MSA recommends host termination resistor value of 560 Ohms, which provides the best balance of performance for both open-drain and active tri-state driver in the module. Host termination resistor values less than 560 Ohms are allowed, to a minimum of 250 Ohms, but this degrades active driver performance. Host termination resistor values greater than 560 Ohms are allowed but this degrades open-drain driver performance. Address lines are driven by host to set the module Physical Port Address which should match the address specified in the MDIO Frame. It is recommended that the Physical Port Addresses not be changed while the CFP2 module is powered on because this will result in unpredictable module behavior.
MDIO Physical Port Addresses. These control pins are used for the system to address all of the CFP ports contained within a host system. PRTADR0 corresponds to the LSB in the physical port addressing scheme. The 5-wire Physical Port Address lines are driven by host to set the module Physical Port Address which should match the address specified in the MDIO Frame. It is recommended that the Physical Port Addresses not be changed while the CFP module is powered on.
