HP5412zl SFP Tx Drops

[lpaz]

We are having a continuous isue with Tx drops on a port in module B on our HP 5412zl switch. Module B is a HP J9535A 20p GT PoE+/4P SFP v2 zl Mod.  The SFP is a J4858C, 1 Gb. This is occuring on a uplink to our WAN provider, and this location is a aggregate point, basically all our buildings point to this switch location for acess to internet and out of building connectivity.

Here are the Details:

firmware: K.15.15.0014, CPU sometimes goes to 15% or a little higher but is usally around 5% or lower, memory total is 125,313,024, free is 69,818,160.

The troublehsooting steps we've taken to date include our WAN provider replacing the switch and equipment on thier end, I installed a new SFP on a different port in Module B, new fiber cable connecting our end to the Vendor, hard set our connection at 1000-full and asked Vendor to hard code their end to 1000-full. It seems this has reduced the number of drops, but they are still occurring.  Bytes Rx currently is 1,714,686,255. Tx currently is 780,935,243. Tx drops currently are 231,803 but keep increasing, even during the times when we do not have much activity present on the circuit.

Here is the output of the Transceiver:

Interface Index : 48
Type : 1000SX
Model : J4858C
Connector Type : LC
Wavelength : 850nm
Transfer Distance : 300m (50um), 150m (62.5um),

Diagnostic Support : DOM
Serial Number : Info Erased

Status
Temperature : 29.617C
Voltage : 3.3142V
Tx Bias : 6.534mA
Tx Power : 0.3154mW, -5.011dBm
Rx Power : 0.3015mW, -5.207dBm

I am going to try upgrading the firmware to K.16.02.0031 tonight and reboot the switch, but after this I am running out of ideas to resolve this. Any assistance offered will be greatly appreciated.

[parnassus]

Optical parameters look good, especially the Tx/Rx Power levels (mW/dBm)...they belong perfectly to the range of Tx/Rx Power admitted values (dBm) [*].

The Tx Bias (mA) - which is the Laser bias current - looks, if compared to one I read on my network, slightly higher to the value I'm used to see on similar SFP Transceivers (although a like-for-like comparison can't be done)...but, in the end, that value doesn't seem worrying at all (indeed you have no alarms).

The Layer 1 looks good.

As example I have a J4858C which is showing:

Temperature : 28.921C
Voltage     : 3.2584V
Tx Bias     : 3.878mA
Tx Power    : 0.3152mW, -5.014dBm
Rx Power    : 0.2796mW, -5.534dBm

as you see the Tx Bias (mA) is about at half your value (6.534 mA)...but, again, both values look good and into the admitted range (at least between 0 mA and 100 mA, probably more).

Is the MTU ok on both ends? How is the cabling (Multi-Mode fiber optic patch cable of OM2 quality Orange color or OM3 Acqua color)? Auto link speed caused more frequents Tx Drops?

[*] Reference ArubaOS-Switch and ArubaOS-CX Transceivers Guide (9th Edition).