I have installed many of these things in switches and routers from EdgeWater, Ubiquiti and Mikrotik. I haven't had a single crash. Sometimes on Mikrotik you need to enable Ethernet auto-negotiation and leave it at 1Gbps/full duplex, but they still work and they're reliable. My longest line is 1.5 km long and I transmit -5.9 dBm and receive -7.8. dBm With attenuators I've tested them down to -22dBm with no issues, so I think they can go much further.
π‘ CM19A R.F. PC Transceiver for X10 Devices
8 Review
TRENDnet TC-TP1 Network Signal Testing Probe with Adjustable Volume, Speaker and Compatibility for TC-NT2
8 Review
10GBase-T SFP+ Transceivers, 10G Copper RJ-45 SFP+ CAT.6a, up to 30 meters, π Cisco SFP-10G-T-S Compatible, Ubiquiti UniFi UF-RJ45-10G Supported, Fortinet, Netgear, D-Link, Supermicro (Pack of 2)
9 Review
MikroTik S+RJ10 Ethernet Transceiver
10 Review
π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
4 Review
π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
π Juiced Systems Silver BizHUB USB-C Multiport Gigabit HDMI Hub with 3 USB 3.0 Ports, Gigabit Ethernet, 4K HDMI, SD/Micro SD, and USB-C Power Delivery
11 Review