The original post: /r/homenetworking by /u/dj__tw on 2025-04-15 04:50:45.
Identifier : 0x03 (SFP)
Extended identifier : 0x04 (GBIC/SFP defined by 2-wire interface ID)
Connector : 0x07 (LC)
Transceiver codes : 0x10 0x00 0x00 0x01 0x00 0x00 0x00 0x00 0x00
Transceiver type : 10G Ethernet: 10G Base-SR
Transceiver type : Ethernet: 1000BASE-SX
Encoding : 0x06 (64B/66B)
BR, Nominal : 10300MBd
Rate identifier : 0x02 (8/4/2G Rx Rate_Select only)
Length (SMF,km) : 0km
Length (SMF) : 0m
Length (50um) : 80m
Length (62.5um) : 30m
Length (Copper) : 0m
Length (OM3) : 300m
Laser wavelength : 850nm
Vendor name : Intel Corp
Vendor OUI : 00:1b:21
Vendor PN : FTLX8571D3BCV-IT
Vendor rev : A
Option values : 0x00 0x3a
Option : RX_LOS implemented
Option : TX_FAULT implemented
Option : TX_DISABLE implemented
Option : RATE_SELECT implemented
BR margin, max : 0%
BR margin, min : 0%
Vendor SN : AKA0CCH
Date code : 150810
Optical diagnostics support : Yes
Laser bias current : 10.258 mA
Laser output power : 0.6345 mW / -1.98 dBm
Receiver signal average optical power : 0.6577 mW / -1.82 dBm
Module temperature : 42.58 degrees C / 108.64 degrees F
Module voltage : 3.2309 V
Alarm/warning flags implemented : Yes
Laser bias current high alarm : Off
Laser bias current low alarm : Off
Laser bias current high warning : Off
Laser bias current low warning : Off
Laser output power high alarm : Off
Laser output power low alarm : Off
Laser output power high warning : Off
Laser output power low warning : Off
Module temperature high alarm : Off
Module temperature low alarm : Off
Module temperature high warning : Off
Module temperature low warning : Off
Module voltage high alarm : Off
Module voltage low alarm : Off
Module voltage high warning : Off
Module voltage low warning : Off
Laser rx power high alarm : Off
Laser rx power low alarm : Off
Laser rx power high warning : Off
Laser rx power low warning : Off
Laser bias current high alarm threshold : 11.800 mA
Laser bias current low alarm threshold : 2.000 mA
Laser bias current high warning threshold : 10.800 mA
Laser bias current low warning threshold : 3.000 mA
Laser output power high alarm threshold : 0.8318 mW / -0.80 dBm
Laser output power low alarm threshold : 0.1585 mW / -8.00 dBm
Laser output power high warning threshold : 0.6607 mW / -1.80 dBm
Laser output power low warning threshold : 0.1995 mW / -7.00 dBm
Module temperature high alarm threshold : 78.00 degrees C / 172.40 degrees F
Module temperature low alarm threshold : -13.00 degrees C / 8.60 degrees F
Module temperature high warning threshold : 73.00 degrees C / 163.40 degrees F
Module temperature low warning threshold : -8.00 degrees C / 17.60 degrees F
Module voltage high alarm threshold : 3.7000 V
Module voltage low alarm threshold : 2.9000 V
Module voltage high warning threshold : 3.6000 V
Module voltage low warning threshold : 3.0000 V
Laser rx power high alarm threshold : 1.0000 mW / 0.00 dBm
Laser rx power low alarm threshold : 0.0100 mW / -20.00 dBm
Laser rx power high warning threshold : 0.7943 mW / -1.00 dBm
Laser rx power low warning threshold : 0.0158 mW / -18.01 dBm
I recently learned that ethtool on Linux can give detailed fiber information. I was looking at my home-built router PCs' Intel FTLX8571D3BCV-IT module recently. I got the adapter used off of Ebay. I was reading how the Laser bias current will slowly increase with age, and eventually wear out. Right now the module is at 10.258, pretty close to the warning and alarm thresholds. Does this indicate that it is getting old, and I should maybe think about replacing it soon? I am not having any issues with the adapter at the moment. Thanks in advance for thoughts.