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История изменений

Исправление Bloody, (текущая версия) :

надо смотреть логи, на некоторых сетевых картах можно читать DDM, если коммутатор - аналогично, 850nm сигнал можно оценить «на глаз», его хорошо видно даже при освещении

ethtool --module-info enp9s0f0
	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                                 : PGCP570100
	Date code                                 : 110302
	Optical diagnostics support               : Yes
	Laser bias current                        : 5.352 mA
	Laser output power                        : 0.5846 mW / -2.33 dBm
	Receiver signal average optical power     : 0.4836 mW / -3.16 dBm
	Module temperature                        : 37.66 degrees C / 99.78 degrees F
	Module voltage                            : 3.3282 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   : 50.000 mA
	Laser bias current low alarm threshold    : 1.000 mA
	Laser bias current high warning threshold : 40.000 mA
	Laser bias current low warning threshold  : 2.000 mA
	Laser output power high alarm threshold   : 1.2589 mW / 1.00 dBm
	Laser output power low alarm threshold    : 0.1175 mW / -9.30 dBm
	Laser output power high warning threshold : 1.0000 mW / 0.00 dBm
	Laser output power low warning threshold  : 0.1479 mW / -8.30 dBm
	Module temperature high alarm threshold   : 90.00 degrees C / 194.00 degrees F
	Module temperature low alarm threshold    : -10.00 degrees C / 14.00 degrees F
	Module temperature high warning threshold : 85.00 degrees C / 185.00 degrees F
	Module temperature low warning threshold  : -5.00 degrees C / 23.00 degrees F
	Module voltage high alarm threshold       : 3.6000 V
	Module voltage low alarm threshold        : 3.0000 V
	Module voltage high warning threshold     : 3.5000 V
	Module voltage low warning threshold      : 3.0500 V
	Laser rx power high alarm threshold       : 1.2589 mW / 1.00 dBm
	Laser rx power low alarm threshold        : 0.0490 mW / -13.10 dBm
	Laser rx power high warning threshold     : 1.0000 mW / 0.00 dBm
	Laser rx power low warning threshold      : 0.0617 mW / -12.10 dBm

Исходная версия Bloody, :

надо смотреть логи, на некоторых сетевых картах можно читать DDM, если коммутатор - аналогично, 850nm сигнал можно оценить «на глаз», его хорошо видно даже при освещении.