03-18-2015 03:31 AM
Ciao,
we are just facing a strange behavior on a FO SM link (span is about 2km).
The link connects one 4506 with X2-10GB-LR to a Nexus 3548 with a 10Gbase-LR: the link is up & running.
The strange behavior is the TX power registered by the X2:
KL-MENARA-CORE#sh int te1/4/1 trans det
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
A2D readouts (if they differ), are reported in parentheses.
The threshold values are calibrated.
High Alarm High Warn Low Warn Low Alarm
Temperature Threshold Threshold Threshold Threshold
Port (Celsius) (Celsius) (Celsius) (Celsius) (Celsius)
--------- ------------------ ---------- --------- --------- ---------
Te1/4/1 9.1 74.0 70.0 0.0 -4.0
High Alarm High Warn Low Warn Low Alarm
Voltage Threshold Threshold Threshold Threshold
Port (Volts) (Volts) (Volts) (Volts) (Volts)
--------- --------------- ---------- --------- --------- ---------
Te1/4/1 3.32 N/A N/A N/A N/A
Optical High Alarm High Warn Low Warn Low Alarm
Transmit Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
--------- ----------------- ---------- --------- --------- ---------
Te1/4/1 -40.0 4.4 0.4 -8.2 -12.2
Optical High Alarm High Warn Low Warn Low Alarm
Receive Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
------- ----------------- ---------- --------- --------- ---------
Te1/4/1 -7.0 4.4 0.4 -14.4 -18.4
As you can see it registering a -40.0 TX .... on the other side:
KL-MENARA-L201# sh int Ethernet1/23 trans det
Ethernet1/23
transceiver is present
type is 10Gbase-LR
name is OEM
part number is SFP+-LR
revision is
serial number is FNS16480367
nominal bitrate is 10300 MBit/sec
Link length supported for 9/125um fiber is 10 km
cisco id is --
cisco extended id number is 4
SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 32.51 C 80.00 C -10.00 C 70.00 C 0.00 C
Voltage 3.20 V 3.63 V 2.97 V 3.46 V 3.13 V
Current 49.50 mA 110.00 mA 1.00 mA 100.00 mA 1.00 mA
Tx Power -0.41 dBm 2.49 dBm -10.22 dBm 0.49 dBm -8.21 dBm
Rx Power -7.67 dBm 2.49 dBm -16.57 dBm 0.49 dBm -14.43 dBm
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
As you can see below the ports are connected together:
KL-MENARA-L201# sh udld ne
Port Device Name Device ID Port ID Neighbor State
--------------------------------------------------------------------------
Ethernet1/21 FOC1852R04H 1 Ethernet1/21 bidirectional
Ethernet1/22 FOC1852R04H 1 Ethernet1/22 bidirectional
Ethernet1/23 SPE184700LE 1 Te1/4/1 bidirectional
Any Idea ?
BR,
Luciano
03-18-2015 09:58 AM
Try to change sfp, it looks like it damaged. If power of other sfp will goot, it mean that original is broken.
03-23-2015 08:46 PM
Too much loss in 2Km of fiber. First check fiber if you have more than a pair in the same cable then try other fibers. If fiber is fine then check SFP.
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