def METHOD_NAME(self, port_num):
    if port_num in self.qsfp_ports:
        # QSFP DOM EEPROM is also at addr 0x50 and thus also stored in eeprom_ifraw
        return None
    else:
        # Read dom eeprom at addr 0x51
        return self._read_eeprom_devid(port_num, self.DOM_EEPROM_ADDR, 256)