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USG9300 optical module power low alarm information: XFP Low Rx power alarming!

Publication Date:  2012-10-10 Views:  97 Downloads:  0
Issue Description
USG9300 optical module alarm log information:
2011-11-10 09:32:24 USG9300%% 01SRM_LOG/2/NODEFAULT (l): Slot = 2; PIC1 of LPU2 checked interrupt, because RXPowLowAlarm of XFP ALARM IS detected. (Reason = "XFP Low Rx power alarming! ")
2011-11-10 09:32:14 USG9300%% 01SRM_LOG/2/NODERESUME (l): Slot = 2; In PIC1 of LPU2, RXPowLowAlarm of XFP ALARM resumed fromfailure.

View the optical interface information:
[USG9300] dis interface GigabitEthernet 2/1/0
09:54:52 10/11/2011
GigabitEthernet2/1/0 current state: UP
Line protocol current state: UP
Description: link-9508e-10g
Route Port
Trunk number: Eth-Trunk0
The Maximum Transmit Unit is 1500 bytes
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 781d-baa4-2d99
The Transceiver Vendor Name is CISCO-OEM
The Transceiver Vendor PN is XFP-10GB-LR
BW: 10G, Transceiver Mode: SingleMode
WaveLength: 1310nm, Transmission Distance: 10km
Rx Power:-15.56dBm, Tx Power: 2.30dBm
Loopback: none, LAN full-duplex mode, Pause Flowcontrol: Receive Enable and Send Enable
Statistics last cleared :2011-10-21 11:45:07
    Last 30 seconds input rate: 531358928 bits / sec, 170948 packets / sec
    Last 30 seconds output rate: 1131879560 bits / sec, 144083 packets / sec
    Input: 172234748589021 bytes, 388943520769 packets
    Output: 279759154998174 bytes, 321773782741 packets
      Unicast: 388943516412 packets, Multicast: 0 packets
      Broadcast: 4357 packets, JumboOctets: 4 packets
      CRC: 2535 packets, Symbol: 219 packets
      Overrun: 0 packets
      LongPacket: 0 packets, Jabber: 0 packets, Alignment: 0 packets
      Fragment: 0 packets, Undersized Frame: 0 packets
      RxPause: 0 packets
      Unicast: 321773782675 packets, Multicast: 0 packets
      Broadcast: 66 packets, JumboOctets: 0 packets
      Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets
      TxPause: 0 packets

The red part: the optical module is CISCO-OEM’s.  RX power:-15.56dBm, optical power is low; Normal Value :-11dBm. 
Alarm Information
Handling Process
Suggest that to replace the optical module as Huawei's optical module. 
Root Cause
Attached: XFP optical module attribute

10G XFP multi-mode optical transceiver module supports two different core diameter multimode optical fiber, the relationship of fiber core diameter, mode bandwidth and transmission distance is as follows. Configuration, the fiber length can not exceed the transmission distance restrictions. And core diameter is50 μm, mode bandwidth is 2000Mhz * km optical fiber, is a special fiber.
XFP optical modules for different fiber transmission distance restrictions: