华三交换机的光口收发光功率正常范围是多少

有些好像不会显示正常范围，就想这个，有个收光-19的不知道正不正常：

display transceiver diagnosis interface

GigabitEthernet3/0/1 transceiver diagnostic information:

Current diagnostic parameters:

Temp(?? Voltage(V) Bias(mA) RX power(dBm) TX power(dBm)

39 3.25 6.99 -4.77 -6.00

GigabitEthernet3/0/2 transceiver diagnostic information:

Current diagnostic parameters:

Temp(?? Voltage(V) Bias(mA) RX power(dBm) TX power(dBm)

38 3.27 7.24 -19.47 -6.29