bad "Cable testing" results on routerboard ports

[elgo]

Hi,

I just tested the link layer with a PC host equiped with an Intel NIC. These NICs are able to report signal quality via driver’s troubleshooting tools.
I ran it when host is connected to a netgear switch, signal is reported to be good, good cable and good harmonic response.
I then take the same cable an plug it to a 450G, and I get a bad signal, and failed IEEE compliance for harmonic response test. To be sure it’s not related to this specific port, I did the same test on another port of the routerboard, same bad results.

[jandafields]

@elgo

Hi,

I just tested the link layer with a PC host equiped with an Intel NIC. These NICs are able to report signal quality via driver’s troubleshooting tools.
I ran it when host is connected to a netgear switch, signal is reported to be good, good cable and good harmonic response.
I then take the same cable an plug it to a 450G, and I get a bad signal, and failed IEEE compliance for harmonic response test. To be sure it’s not related to this specific port, I did the same test on another port of the routerboard, same bad results.

But did you test on another routerboard? Maybe you have a bad routerboard.

[WirelessRudy]

Yes please, try some other boards. Depending on the results this can be interesting! (port flap / many Ethernet port issues)

[elgo]

Sorry guys, I only have one unit, and I feel like there won’t be another one any time soon

[InoX]

they are weak, can’t even work with 80-120m of good ftp cable, only at 10mbps. Al the 10$ switches work without problems.

[jandafields]

@InoX

they are weak, can’t even work with 80-120m of good ftp cable, only at 10mbps. Al the 10$ switches work without problems.

Try using http cable instead of ftp cable

Seriously though, why are you trying to run cat5 more than 100m? 100m is the official max distance.

[elgo]

@jandafields

@InoX

they are weak, can’t even work with 80-120m of good ftp cable, only at 10mbps. Al the 10$ switches work without problems.

Try using http cable instead of ftp cable
Seriously though, why are you trying to run cat5 more than 100m? 100m is the official max distance.

Thanks for making this topic funny
Btw, in my case a plain good 1m FTP cat5e cable is used during tests.

[elgo]

@WirelessRudy

Yes please, try some other boards. Depending on the results this can be interesting! (port flap / many Ethernet port issues)

Mmmm, I noticed something: LEDs on etherports (green and orange ones) are less and less “bright” when going from ether1 to ether5. I mean, they seem to get like less current ether5 side than ether1 side.
Maybe it’s totally unrelated, but (during next downtime) I’ll run this test on ether1 and ether5 ports to see if I get sensible different data on link quality.