最近发现cisco 4506E 出现如下问题：现象：
SW001#show interfaces transceiver module 2
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)
--------- ----------- ------- -------- --------
Gi2/5 30.9 3.30 -5.9 -15.6
Gi2/11 30.3 3.29 -5.8 -14.5
Gi2/12 31.0 3.29 -5.9 -18.2
Gi2/18 29.7 3.29 -6.5 -18.8
Gi2/20 29.2 3.29 -5.7 -10.5
SW001#show logging
Log Buffer (32768 bytes):
value: -40.0 dBm, Threshold value: -21.0 dBm.
.Mar 12 00:00:50.603: %SFF8472-5-THRESHOLD_VIOLATION: Gi2/12: Rx power low warning; Operating value: -18.7 dBm, Threshold value: -17.0 dBm.
.Mar 12 00:10:25.143: %SFF8472-5-THRESHOLD_VIOLATION: Gi2/5: Rx power low warning; Operating value: -20.1 dBm, Threshold value: -17.0 dBm.
.Mar 12 00:10:35.720: %SFF8472-5-THRESHOLD_VIOLATION: Gi2/18: Rx power low warning; Operating value: -19.0 dBm, Threshold value: -17.0 dBm.
.Mar 12 00:10:50.708: %SFF8472-5-THRESHOLD_VIOLATION: Gi2/12: Rx power low warning; Operating value: -19.0 dBm, Threshold value: -17.0 dBm.
.Mar 12 00:20:25.243: %SFF8472-5-THRESHOLD_VIOLATION: Gi2/5: Rx power low warning; Operating value: -19.9 dBm, Threshold value: -17.0 dBm.
.Mar 12 00:20:35.822: %SFF8472-5-THRESHOLD_VIOLATION: Gi2/18: Rx power low warning; Operating value: -19.0 dBm, Threshold value: -17.0 dBm.
操作：
（1）更换SFP 模块，警告问题还是存在
（2）更换SFP模块尾纤，警告问题还是存在
请问下哪位遇到此类似问题？该怎么解决呢？:)
