If retransmission is not used in a given transmit direction, this parameter reports the actual net data rate at which the bearer channel is operating in L0 power management state, and in L1 or L2 states, the parameter contains the net data rate in the previous L0 state. If retransmission is used in a given transmit direction, this parameter reports the Expected Throughput(ETR) at which the bearer channel is operating in L0 power management state, and in L1 or L2 states, the parameter contains the Expected Throughput(ETR) in the previous L0 state. The data rate is coded in steps of 1000 bit/s. The invalid value is 4294967295. If data on the port is invalid or no data is generated on the port because the port has not been activated, the invalid value will be returned. Unit: bits/second