How to setup rj-45 console to usb on fedora 22?

Question

USB

there is a mellanox sx1012 switch. it has rj-45 to usb.
I stick in console manage port of a switch and in usb of a computer. uplink does not appear on the port. the system throws out like this:
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: new low-speed USB device number 9 using ehci-pci
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: device descriptor read/ 64, error -32
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: device descriptor read/64, error -32
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: new low-speed USB device number 10 using ehci-pci
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: device descriptor read/64, error -32
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: device descriptor read/64 , error -32
Sep 24 13:17:13 sm1ly kernel: usb 2-1.2: new low-speed USB device number 11 using ehci-pci
Sep 24 13:17:14 sm1ly kernel: usb 2-1.2: device not accepting address 11, error - 32
Sep 24 13:17:14 sm1ly kernel: usb 2-1.2: new low-speed USB device number 12 using ehci-pci
Sep 24 13:17:14 sm1ly kernel: usb 2-1.2: device not accepting address 12, error -32
Sep 24 13:17:14 sm1ly kernel: usb 2-1-port2: unable to enumerate USB device
where to go, where to go?

Answer 1

1. your device is not recognized, each usb device has an identifier - they are located here /etc/usb_modeswitch.d
2. you need to find the identifier or description on the vendor's website
3. register, restart the module
4. you will see the device in / dev
5. work