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a.m Beginner
Beginner

Access the console using RJ45-to-USB adapter

Hello,

I was trying to connect to my switch using RJ45-to-USB adapter, like the one shown in the photo:31qmFfaS8dL.jpg

I failed to get access, and I got the following messages under Linux's dmesg :

[  183.932077] usb 1-1.2: new full-speed USB device number 7 using ehci-pci
[  184.012073] usb 1-1.2: device descriptor read/64, error -32
[  184.200070] usb 1-1.2: device descriptor read/64, error -32
[  184.596067] usb 1-1.2: new full-speed USB device number 8 using ehci-pci
[  184.676073] usb 1-1.2: device descriptor read/64, error -32
[  184.864072] usb 1-1.2: device descriptor read/64, error -32
[  185.052080] usb 1-1.2: new full-speed USB device number 9 using ehci-pci
[  185.468071] usb 1-1.2: device not accepting address 9, error -32
[  185.548074] usb 1-1.2: new full-speed USB device number 10 using ehci-pci
[  185.964068] usb 1-1.2: device not accepting address 10, error -32
[  185.964316] usb 1-1-port2: unable to enumerate USB device
[  253.160072] usb 1-1.2: new full-speed USB device number 11 using ehci-pci
[  253.240073] usb 1-1.2: device descriptor read/64, error -32
[  253.428076] usb 1-1.2: device descriptor read/64, error -32
[  253.616074] usb 1-1.2: new full-speed USB device number 12 using ehci-pci
[  253.696075] usb 1-1.2: device descriptor read/64, error -32
[  253.884043] usb 1-1.2: device descriptor read/64, error -32
[  254.072074] usb 1-1.2: new full-speed USB device number 13 using ehci-pci
[  254.488073] usb 1-1.2: device not accepting address 13, error -32
[  254.568080] usb 1-1.2: new full-speed USB device number 14 using ehci-pci
[  254.984072] usb 1-1.2: device not accepting address 14, error -32
[  254.984367] usb 1-1-port2: unable to enumerate USB device

Does any one have a idea about the problem ?

 

Kind regards;

 

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
Rising star

Re: Access the console using RJ45-to-USB adapter

Hi,

I am sorry to say that in my view your adapter is intended for USB to 10/100 Ethernet usage (eg. USB modem to router LAN) ie. it is NOT suitable for the console port. While console ports use also RJ-45 type sockets the pin assignments are completely different. The "Console" is serial port NOT Ethernet.

 

Best regards,

Antonin

View solution in original post

9 REPLIES 9
Beginner

Re: Access the console using RJ45-to-USB adapter

Sorry I am unfamiliar with that device. The ones I purchased on Amazon work wonders. I know they have a build in chip (don't know what its use for) but I never had any issues

 

link below

https://www.amazon.com/gp/product/B01AFNBC3K/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

a.m Beginner
Beginner

Re: Access the console using RJ45-to-USB adapter

Your cable seems different, it contains 8 wires. My adapter includes only 4.
Does it mean that it isn't suitable for consoles ?
Beginner

Re: Access the console using RJ45-to-USB adapter

I could be totally wrong but I feel 90% certain. 4 wires are whats used for telephone communications and other things not Fast Ethernet/Networks

 

 

Just took a look at the photo and yes I am 100% certain you are using the wrong device my friend lol.

order one when the link i sent you.

 

 Those errors seems like there trying to communicate on but it can cause the wires on

5 6 7 8 are missing and your only have wires 123 4 connected

 

3, 6 are the RX ports

1 , 2 are the TX ports

 

TX=transmit

Rx= recieve

so the computer is receiving but it cant send because those wires are missing =0).

a.m Beginner
Beginner

Re: Access the console using RJ45-to-USB adapter

Thank for your reply.

The problem is that 1,2,3 and 6 are the connected pins in my adapter.

 

Beginner

Re: Access the console using RJ45-to-USB adapter

Hello,

 

There is nothing wrong with the device, Linux basically could not correctly recognize it. Please update device drivers on your Linux box if possible. 

a.m Beginner
Beginner

Re: Access the console using RJ45-to-USB adapter

Hello,

 

Thank you for your reply.

My Linux is up to date. Also, USB drives work perfectly.

Is there any way to check if the problem is Linux or the adapter ?

Regards;

Beginner

Re: Access the console using RJ45-to-USB adapter

Hello,

 

USB drives themselves are different thing. You are connecting a device through USB port. It could be that you may need USB to Console or USB to Ethernet drivers on you system to make it work.

 

First thing I would check - supplier web site of this device. May be there are some information how to make this thing work under Linux. 

Rising star

Re: Access the console using RJ45-to-USB adapter

Hi,

I am sorry to say that in my view your adapter is intended for USB to 10/100 Ethernet usage (eg. USB modem to router LAN) ie. it is NOT suitable for the console port. While console ports use also RJ-45 type sockets the pin assignments are completely different. The "Console" is serial port NOT Ethernet.

 

Best regards,

Antonin

View solution in original post

a.m Beginner
Beginner

Re: Access the console using RJ45-to-USB adapter

Hello

I found the answer, as @amikat said, The cable is not suitable for console. A USB-Serial converter (FT232R) is missing in the cable to work correctly.

I used this mapping before :

PC- USB - RJ45.gif

 

Regards;

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