C1_3560#sh int transceiver
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
Optical Optical
Temperature Voltage Tx Power Rx Power
Port (Celsius) (Volts) (dBm) (dBm)
--------- ----------- ------- -------- --------
Gi1/1 29.5 3.31 -5.6 -6.2
Gi1/3 28.8 3.31 -5.6 -6.5
show int transceiver应该有一段文本说明。(如上),个人建议没有告警基本上就行,你上面的Rx 已经有--级别的的告警了。这种情况下建议换纤了。。