[c-nsp] SFP/Transceiver Issue
Tim Rayner
Tim.Rayner at aarnet.edu.au
Tue Sep 8 05:39:40 EDT 2015
Hi Mahammed,
Looks like you're receiving far too much optical power on Te2/8/1. At +2.6dBm, you will be overloading the receiver on any type of optic. That is what the "++" is warning you about. Typically ZR class optics transmit at between +0 and +3 or +5 dBm, and can receive from -7 or -8 dBm down to -23dBm.
I suggest you need a 10dB attenuator on the RX side of Te2/8/1. If you don't have one of those, you could try leaving an air-gap of a few mm - ie. only half plug it in, or bending the patch lead until the link comes up... The proper way is with the attenuator - the other methods are just things to try - to confirm that your problem is too much receive power on Te2/8/1. You probably want the same attenuator in the other direction, though its harder to be definitive when the Rx power is listed as N/A !
I have seen some links work for a while with too much receive power, then stop working - which is the symptom that you describe.
Good Luck with it!
Regards
Tim.
Tim Rayner
Optical Engineer, AARNet Pty Ltd
street address: Building 9, Banks Street, YARRALUMLA ACT 2600
postal address: GPO Box 1559, CANBERRA ACT 2601
t. +61 2 6222 3575 f. +61 2 6222 3535 e. Tim.Rayner at aarnet.edu.au
w. www.aarnet.edu.au
Network Faults (24x7): 1300 APL NOC (1300 275 662) or noc at aarnet.edu.au
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From: cisco-nsp [cisco-nsp-bounces at puck.nether.net] on behalf of Mohammad Khalil [eng_mssk at hotmail.com]
Sent: Tuesday, 8 September 2015 7:26 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] SFP/Transceiver Issue
Hi all
I am trying to connect a link between my 6509 box and N5K box
The link was functioning well , but now it is never up
I have tried to change the SFP with no luck
Please check below
HQ-UM-CORE-VSS#show int Te2/8/1 transceiver
Transceiver monitoring is disabled for all interfaces.
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
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 Current Tx Power Rx Power
Port (Celsius) (Volts) (mA) (dBm) (dBm)
---------- ----------- ------- -------- -------- --------
Te2/8/1 28.8 0.00 69.2 -- 1.6 2.6 ++
HQ-UM-N5K-B# show int ethernet 1/1 transceiver
Ethernet1/1
transceiver is present
type is 10Gbase-(unknown)
name is CISCO-FUJITSU
part number is FIM35050/203
revision is 0001
serial number is FLJ1708K03G
nominal bitrate is 11100 MBit/sec
Link length supported for 9/125um fiber is 80 km
cisco id is --
cisco extended id number is 4
HQ-UM-CORE-VSS#show int tenGigabitEthernet 2/8/1 transceiver detail
Transceiver monitoring is disabled for all interfaces.
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)
---------- ------------------ ---------- --------- --------- ---------
Te2/8/1 33.2 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)
---------- --------------- ---------- --------- --------- ---------
Te2/8/1 0.00 N/A N/A N/A N/A
High Alarm High Warn Low Warn Low Alarm
Current Threshold Threshold Threshold Threshold
Port (milliamperes) (mA) (mA) (mA) (mA)
---------- ----------------- ---------- --------- --------- ---------
Te2/8/1 69.3 -- 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)
---------- ----------------- ---------- --------- --------- ---------
Te2/8/1 1.6 7.9 3.9 0.0 -4.0
Optical High Alarm High Warn Low Warn Low Alarm
Receive Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
---------- ----------------- ---------- --------- --------- ---------
Te2/8/1 2.7 ++ -3.0 -7.0 -24.0 -28.2
==========================================================================
HQ-UM-N5K-B# show int eth1/1 transceiver details
Ethernet1/1
transceiver is present
type is 10Gbase-(unknown)
name is CISCO-FUJITSU
part number is FIM35050/203
revision is 0001
serial number is FLJ1708K03G
nominal bitrate is 11100 MBit/sec
Link length supported for 9/125um fiber is 80 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 59.88 C 75.00 C -5.00 C 70.00 C 0.00 C
Voltage 3.24 V 3.63 V 2.97 V 3.46 V 3.13 V
Current 78.10 mA 105.00 mA 35.00 mA 98.00 mA 42.00 mA
Tx Power 1.70 dBm 6.99 dBm -4.00 dBm 3.99 dBm 0.00 dBm
Rx Power N/A -- -3.00 dBm N/A -7.01 dBm -26.98 dBm
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
*** SFP diagnostics data may be invalid! ***
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