How to check if sfp works on dgs-3420-28pc?

Question

network hardware

On the dgs-3420-28pc switch, you need to connect a LAN from a neighboring building, the Internet will be taken from there, the distance is 500 meters, single-mode optics are thrown, embroidered on 3 patch cords, one goes to the switch through the sfp module, the LED says that the link is available, how to check in the console network performance and is there actually a link in fact? When connecting the equipment, the network card does not receive ip, do I need to configure routing from the sfp port to the rest in the switch?
I’ll clarify, the first time I connected the laptop to the switch, the network card received an ip address and windows saw the domain and local area of ​​the neighboring building, ipscan saw the entire network. After 5 minutes of work - there is no network (more precisely, it is not determined, the ip address is not issued).
they tell me that something is wrong on my side, but it seems to me that they are blocking me, trying to figure it out.

Answer 1

port with sfp and port where do you turn on the equipment in the same vlan? In general, is there a dhcp server in this vlan to issue addresses?

Answer 2

1. What kind of sfp modules do you have? 100 or 1000 Mbps? At what range? Or maybe even sfp + on 10G?
2. A switch with PoE, therefore, when connecting a laptop directly, you need to make sure that PoE is turned off on the connected port, otherwise you risk burning the network card in the laptop (if you haven’t already burned it).
3. The default address for Dlinks is 10.90.90.90, connect at least on the web, at least on telnet and check the settings, and also see the status of the ports, errors.
ps Why do you need such an expensive layer 3 switch, and even with PoE?