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If you look after networks, or other network devices such as routers or switches, then you'll need no introduction to the Console cable.
What this does is allow you to connect via the serial connection of your PC (normally a laptop) to use what is called the CLI (command line interface). Out of the box, a cisco will come with either basic config, or no useable config so the first job you have is to connect you console cable and get started on the configuration.
I'm not sure how many cable's that Startech sell, but due to the fact that you get an official Cisco cable with every new device, not many. However, it does exactly the same job as the official cable and is around a foot longer, which is handy when you are out in the field. Most Cisco console connections are at the rear of the device (expect the larger core routers) and so having the extra length allows you more felxability to work.
The only downside to using this cable is that Cisco now produce thier console cables with a RJ45 at one end and a Serial 9pin at the other, ready to go 'as is'. This cable has a RJ45 at both ends, meaning you also need a serial 9pin adapter to use it with your PC serial port.
I would expect one to be included, but it doesn't seem so.
There is another version of this cable that does have a serial at one end. Buy that instead, unless you have a need for RJ45 at both ends.