我们有 cisco nexus 9000 和 40G 接口之一，在我检查命令行时显示端口收发器功率级别警告我发现如下。
问题：
以 dBm 为单位的收发器的正常功率电平是多少？
如果它处于警告/警报级别会有什么影响？（目前我没有遇到问题）
# show int e2/11 transceiver details
Ethernet2/11
transceiver is present
type is QSFP-40G-SR4
name is Fiberstore
part number is QSFP-SR4-40G
revision is B
serial number is D87C2016912
nominal bitrate is 10300 MBit/sec per channel
Link length supported for 50/125um OM3 fiber is 150 m
cisco id is 13
cisco extended id number is 16
Lane Number:1 Network Lane
SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 25.79 C 80.00 C -10.00 C 73.00 C -3.00 C
Voltage 3.40 V 3.59 V 3.00 V 3.46 V 3.13 V
Current 7.03 mA 11.00 mA 2.00 mA 10.00 mA 3.00 mA
Tx Power -3.01 dBm 3.99 dBm -10.60 dBm 0.99 dBm -7.61 dBm
Rx Power 1.08 dBm + 3.99 dBm -12.51 dBm 0.99 dBm -9.50 dBm
Transmit Fault Count = 0
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
Lane Number:2 Network Lane
SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 25.79 C 80.00 C -10.00 C 73.00 C -3.00 C
Voltage 3.40 V 3.59 V 3.00 V 3.46 V 3.13 V
Current 7.03 mA 11.00 mA 2.00 mA 10.00 mA 3.00 mA
Tx Power -2.73 dBm 3.99 dBm -10.60 dBm 0.99 dBm -7.61 dBm
Rx Power 0.08 dBm 3.99 dBm -12.51 dBm 0.99 dBm -9.50 dBm
Transmit Fault Count = 0
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
Lane Number:3 Network Lane
SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 25.79 C 80.00 C -10.00 C 73.00 C -3.00 C
Voltage 3.40 V 3.59 V 3.00 V 3.46 V 3.13 V
Current 7.03 mA 11.00 mA 2.00 mA 10.00 mA 3.00 mA
Tx Power -3.11 dBm 3.99 dBm -10.60 dBm 0.99 dBm -7.61 dBm
Rx Power 1.63 dBm + 3.99 dBm -12.51 dBm 0.99 dBm -9.50 dBm
Transmit Fault Count = 0
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
Lane Number:4 Network Lane
SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 25.79 C 80.00 C -10.00 C 73.00 C -3.00 C
Voltage 3.40 V 3.59 V 3.00 V 3.46 V 3.13 V
Current 7.10 mA 11.00 mA 2.00 mA 10.00 mA 3.00 mA
Tx Power -3.09 dBm 3.99 dBm -10.60 dBm 0.99 dBm -7.61 dBm
Rx Power 1.56 dBm + 3.99 dBm -12.51 dBm 0.99 dBm -9.50 dBm
Transmit Fault Count = 0
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning