I've never used a cisco switch. On the used 3048t i just got, there's a dedicated management ethernet port on the back, so i was blindly assuming it would just accept a dhcp address and give me ssh, telnet or at least a webinterface. It does send DHCP requests, but then never responds to arp for those addresses.
The official documentation mentions you're supposed to connect via serial, but never mentions the cabling. It's not a DB9 connector so no way of knowing voltages, pins etc.
Is there a way to do to this over ethernet or do i absolutely need to find a cable, and which one could it be?