code: def max_bit_rate(self):
          
          status = self.fc.call_action('WANCommonInterfaceConfig',
                                       'GetCommonLinkProperties')
          downstream = status['NewLayer1DownstreamMaxBitRate']
          upstream = status['NewLayer1UpstreamMaxBitRate']
          return upstream, downstream
docs: Returns a tuple with the maximun upstream- and downstream-rate
          of the given connection. The rate is given in bits/sec.