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Hello, I wonder how (if possible) to connect two gc510p switches? When I try with a cable they do not connect, so I wonder if there is a setting I need to modify or how to do it.
Sounds a liiiiiitle bit dangerous for this job 8-0
Give him some assistance - convinced in the team you manage it. Same time you learn on how to make the cables and the installation, it's not difficult in general.
Be very picky that exact the same pairs are set-up on the screw ports of the wall outlet. If this still does not allow Gigabit Ethernet, consider to replace the wall ports by at least CAT5E (betterCAT6A) capable plug system intended for network installations.
Of course a common RJ45 CAT5E or better cable or an SFP-DAC or a set of SFP fiber modules with a matching fiber pair (crossed of course) will link up two GC510P or a GC510P with another switch model.
We're commonly deploy short passive DAC or fiber links (for longer distances) for GC510P uplinks, in a LAG with two links.
Little bit lost what you have tried, what effective issues you are experiencing, .... Ethernet links up?
The fact that the D-Link does negotiate to 10 or 100 Mbit/s does also proof that there is something wrong with the 20 meter cabling. Does the installed cable terminate direct on the RJ45 connectors we see on the photo with the D-Link switch on the port #1? If yes, make good pics from both crimped connectors so we see the coloured pairs properly. If there is to much mixed or crossed-out, the switches Auto-X capacity might be able to "fix" things partially.
Patch cord is definitively wrong - 12356478 ... the pair 56 must be in the middle, the pair 34 span over the middle pair, ....
And if these telephone wall outlets are working at the 100 MHz frequences required for is kind a luck (but it's often OK). Hard to say if the wires are right on the wall plug...
Edit: Look for example here - https://www.howtogeek.com/60486/how-to-make-your-own-custom-length-network-cables/ - it does not matter if usich the Scheme A or Scheme B - but always use the same on both ends of a patch cable or a wall installation. Yuu see: The blue pair is always in the middle, and the amber/orange one goes around that one.
I attached a new image that shows a little bit better the order of the cables. For me it looks like T568B but the white-blue (3 in attached image) and white-green (5 in attached image) mixed compared to the standard. The rest looks ok, or am I reading it wrong?
But, it seems that 3 and 5 was twisted in the same way on the other end. So actually it does look ok for me (assuming that the wall connector is ok).
Trouble is that this is RF transmission, and twisted pairs are essential - plain "correct" or logical DC connection is not sufficient. The colours don't really matter as log as the related pairs are the same on both ends.
12 3- 45 -6 78 this kind of illustrate the pairs ( identified always full colour and white/colour). Yours is 12 34 56 78 - so on four wires there are not the correct twisted pairs used.
I just did a test with a 20 m purchsed cable that I have and it works perfect. So for sure there seems to be an issue in the 20 m cable my electrician installed in walls of the house.
Since I am not an expert of this matter, I am not able to understand exactly what this means:
"Yours is 12 34 56 78 - so on four wires there are not the correct twisted pairs used."
Would it be possible to be a bit more specific on this as I am not able to actually understand what the issue is.
"Yours is 12 34 56 78 - so on four wires there are not the correct twisted pairs used."
Would it be possible to be a bit more specific on this as I am not able to actually understand what the issue is.
Is there a difference between?
12 3- 45 -6 78
12 34 56 78
Yes, wrong copper strands are used for the inner pairs. It's essential - because symmetric data signals are used - that the correct twisted pairs are used. In these cables, the pairs with the same colours are twisted on some specific way - and this must be used all through the installation, on patch cord, and on the wall installations.
12 Pair 1
36 Pair 2
45 Pair 3
78 Pair 4
Your electrician needs some more training for data installations I'm afraid. This is not telephony or ISDN - these are RF frequencies as used in not so long ago on cable TV networks. I'm still not convinced that these wall plugs (coming from the POTS/telephony/ISDN times) are feasible for the 100 MHz PAM modulation used for Gigabit Ethernet (cable testing as per the standards for Gigabit CAT5A is done to 100 MHz, 10GBase-T 10 Gigabit Ethernet runs on installations with PAM16 to be tested are tested up to 500 MHz). Good electricians bring test equipment and provide a proof of the cable test result (correct pinout, estimated length, cable attenuation, ...), too - or they exactly know what they do... Even experienced installers have some low error rates, and need to rework after testing.
I think I got it now and understood what we need to do. A little curiosity - my electrician is actually color blind so this may explain why it got messed up with the cables..
Sounds a liiiiiitle bit dangerous for this job 8-0
Give him some assistance - convinced in the team you manage it. Same time you learn on how to make the cables and the installation, it's not difficult in general.
Be very picky that exact the same pairs are set-up on the screw ports of the wall outlet. If this still does not allow Gigabit Ethernet, consider to replace the wall ports by at least CAT5E (betterCAT6A) capable plug system intended for network installations.
