Imagine this, you are a technician that often need to configure/re-configure Cisco devices – this mean you have to carry with you a laptop and the blue Cisco cable to configure those darn devices..
Well that was then, this is now 🙂 Now all you need is this cable, your iPhone and an App.. Clever indeed 😀
http://techotrack.com/archives/4806
Ps. Should you need an RJ11 connector that is also an option;
http://www.engadget.com/2010/02/12/redpark-announces-serial-and-rj-11-cables-for-iphone-ipod-touch/