I am not sure about the standards for serial cable length and Cisco equipment.
My answer may be oversimplistic, but take your router to your desk and connect the console cable. Use hyperterm in Windows to create a session to the router. There you can perform the initial configuration and also enable telnet and assign a management IP Address. Once this is done, then you can connect the epuipment to your network and then manage the switch via a telnet session.