“XZSNET 1000BASE-T SFP Transceiver, SFP to RJ45”
I just got it delivered and plugged it in. Linux detected it as it should and it auto-negotiated gigabit speeds with my Netgear (gigabit) switch. I’m able to pass traffic just fine and even scp’d a few things. No benchmarks yet though.
Shows up as eth1:
root@OpenWrt:/# ethtool eth1
Settings for eth1:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseX/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 1000baseX/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 1000baseX/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Current message level: 0x000000ff (255)
drv probe link timer ifdown ifup rx_err tx_err
Link detected: yes
Not sure why it says, “FIBRE” but it works so… Whatever 
This is what dmesg says about it:
root@OpenWrt:/etc# dmesg | grep sfp
[ 2.404444] sfp sfp@0: Host maximum power 3.0W
[ 2.408907] sfp sfp@0: tx disable 1 -> 1
[ 2.412998] sfp sfp@0: SM: enter empty:detached:down event dev_attach
[ 2.419439] sfp sfp@0: SM: exit empty:down:down
[ 2.424096] sfp sfp@1: Host maximum power 3.0W
[ 2.428554] sfp sfp@1: tx disable 1 -> 1
[ 2.432484] sfp sfp@1: SM: enter empty:detached:down event insert
[ 2.438571] sfp sfp@1: SM: exit probe:detached:down
[ 2.443573] sfp sfp@1: SM: enter probe:detached:down event dev_attach
[ 2.450010] sfp sfp@1: SM: exit probe:down:down
[ 2.759028] sfp sfp@1: SM: enter probe:down:down event timeout
[ 2.775987] sfp sfp@1: module OEM SFP-GE-T rev A sn C23Y32WS03000 dc 240109
[ 2.785462] sfp sfp@1: sfp: support mode 00,00000200,00006040
[ 2.810055] sfp sfp@1: SM: exit present:down:down
[ 15.411562] sfp sfp@1: SM: enter present:down:down event dev_up
[ 15.417526] sfp sfp@1: tx disable 1 -> 0
[ 15.421496] sfp sfp@1: SM: exit present:up:wait
[ 15.489344] sfp sfp@0: SM: enter empty:down:down event dev_up
[ 15.495093] sfp sfp@0: SM: exit empty:up:down
[ 15.499642] sfp sfp@1: SM: enter present:up:wait event timeout
[ 15.505511] sfp sfp@1: probing phy device through the [MDIO_I2C_NONE] protocol
[ 15.512821] sfp sfp@1: SM: exit present:up:link_up
NOTE: This is with the version of OpenWRT that came with the BPi-R4. I haven’t updated it (yet).
I have no affiliation with this vendor or amazon or anything else like that. I just wanted to report what worked for me since I couldn’t find much in the way of a “compatibility chart” and few folks reported using SFP at all in this forum for non-fiber stuff. I plan to keep all the regular LAN ports as LAN ports and use SFP for the WAN and this transceiver makes that work. Nice and cheap too
