The two computers are Windows 7 machines or Synology rack stations, all with SDDs and 1Gpbs network cards. When using an unmanaged switch I constantly saturate the network at about 800Mbps with any combinations of machines and cables. Speed was measured with LAN_SpeedTest.exe and jperf-2.0.2
Things I tried:
Different ports on SG30-20: not a significant difference, in certain cases the “Packets with Error” percentage is lower
Different network cables: all cables tested OK, both with the Cooper Test and in the unmanaged switch test (see above)
Every single firmware since 22.214.171.124, with “Restore to Factory Defaults”
Reload the new bootloader firmware
Unplug the power cable (after switch started) and let it rest for a while
Pressing the reset button to “Restore to Factory Defaults”
The switch is in inside a well-ventilated rack in my office (ambient temperature is about 78F). The switch is warm to touch, but not hot. To be thorough, I let the switch cool for 1 hour (unplugged the power cord) and set up a fan to blow air on the switch. It did not make a difference from the previous results.
However, I noticed a pattern:
- Ports 1-16 report errors (mostly “Internal MAC Receive Errors”) and have low throughput speeds (about 100-150 Mbps)
- Ports 17-20 report zero errors and have relatively high throughput speeds (about 300-500 Mbps, however I am not able to saturate the 1Gbps connection)
- Mixing Ports 1-16 and 17-20 shows speeds about 200Mbps
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