Fiber interface dBm power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following.

Question:

1. what is the normal power level for transceiver in dBm?
2. what would be the impact if its in warning/alarm level? (currently i am not experiencing issue issue)

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# 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