I haven't found a guide on the web and am wondering if anyone can point me to a how-to or show me the steps. Basically, I'd like to craft something like this: http://www.amazon.com/CableRack-Rollover-Console-Cable-Cisco/dp/B00GN5OHIW
I have a USB connector, cat5e cabling and RJ45 jacks. I assume there's some converting that has to be done in the middle to convert USB's 4 wires to cat5e's 8 wires.. I appreciate any help, thanks.
How to: USB RS232 to RJ45 interface pinout | Hardware Canucks
switch - How do I build a USB-to-rollover RJ45 Cisco console cable? - Network Engineering Stack Exchange
Console Cable Suggestions
I do not have a USB to RJ45 console cable, but instead I have a USB to RJ45 adaptor. Does the adaptor still require a rollover cable to connect the RJ45 port of the adaptor to the RJ45 console port of an old Cisco switch, or does a straight cable suffice?
That RJ45 to USB cable is not an Ethernet adapter.
It might superficially look like one, but it’s not.
That cable you purchased is a known as console cable (aka: Cisco cable or rollover cable). It’s meant/designed to connect your PC to a server (or other enterprise level device) via RS232; aka serial connection or link. That is not an Ethernet adapter, and cannot be used as one at all.
Generally, what you are looking for is a USB to Ethernet adapter that looks something like this:
You would plug the USB side into your PC and then connect the Ethernet end to your LAN via an Ethernet cable. These are fairly common to come by and should be pretty affordable. Just make sure to check if the USB A to RJ45 adapter you purchase explicitly states it’s an Ethernet adapter.
The 8P8C connector (commonly known as RJ45, even though this is incorrect) is used for a lot of different things.
While nowadays its most common use is for (some kinds of) Ethernet, it can also be used:
- For RS-232 or other similar serial ports (instead of the more common DB-25 or DE-9 connectors), especially for console access on Cisco routers and other devices;
- For analogue telephony (aka POTS);
- For digital telephony (aka ISDN);
- For proprietary telephony systems;
- Sometimes even USB;
- And many other things.
The adapter you bought is for the first type: to connect to an RS-232 serial port presented as 8P8C (RJ45). It is completely unrelated to Ethernet.
What you need is a USB Ethernet adapter. They come in many different shapes and sizes, and have varying characteristics and performances (100 Mbit/s, Gigabit, 2.5GbE, USB 2, USB 3, USB-A, USB-C...). You need to make sure the description of the product includes "Ethernet", along with the specs you want.
Some docks (especially USB-C docks) also include Ethernet ports, so it may be an alternative if you need other interfaces (more USB, HDMI, etc.).
If your computer has a USB-C port, you're probably better off using an adapter using that kind of port. Given the low prices of such adapters, picking a 2.5GbE adapter is probably a good idea even if you won't use it at its maximum potential if your switch/router doesn't support such speeds.
While there are a few adapters that take the form of a cable (with a male "RJ45" at the other end like the one you bought), most will have a female connector, and you will then need an Ethernet cable to connect that to the corresponding connector on your switch or router. The advantage is that you can easily change the cable if you need shorter or longer distances (or if the cable or plug gets damaged).
I haven't seen one. It would have limited usefulness as Juniper, Cisco, Linksys, APC, HP Procurves, our Raritan power strips, etc all use different cables -- and some use different baud rates.
We've got a box of cables in our cage labelled with the baudrate/connection protocol and devices that it works with.
It is technically possible. I don't see it as being a big seller though.
If there is still interest I produce a cable assembly to do just this. As for the need to have a box of cables for different devices and each of them labeled with the communication protocol and baud rate I am at a loss for words. The baud rate and communications protocol utilized by a specific device has nothing to do with the cable the data is transmitted on. I have a feeling that if you took the time to actually pin out all of the cables you use to support your equipment you will likely find (2) pinout variations when the cable is terminated to an 8P8C (typically though incorrectly referred to as RJ45). It is also very likely that any of you devices which have a DB9 male connector mounted in the panel of the device can be accessed through the use of a null modem and console cable. This of course would mean the vast majority of the cables could be discarded and only the communication protocols/BAUD rates be retained but I am sure maintaining numerous cables in a box gives someone a purpose and feeling of importance.
All hail inefficiency!!
What you are looking at is not just a simple cable, but a USB-to-serial adapter with electronics built in to handle the conversion. It isn't an ethernet cable, and it doesn't require Category-5E. Cisco has had serial-to-serial rollover cables forever, using telephone-grade cable.
If you have a standard Cisco rollover cable, which comes with just about every Cisco device, all you need is a USB-to-serial adapter, and the software which comes with the adapter. This is just those two things combined.
You can do it, all you need is a USB-Serial converter chip, and wiring that in properly with the incoming USB cable and the outgoing cable with the 8P8C connector on the end. You can even buy complete boards which has the chip and assorted power components installed. But the cost for all these approaches are larger than the cost of an off-the-shelf USB-Serial adapter.