APCAP9827 Simple Signalling USB to RJ45 UPS Cable

Will this work to hook up printer to laptop? my ethernet out is used for cable modem connection.

It suppose to be 10 pin RJ50, not 8 pin RJ45 connector.

How long is this cable? I need longer than 6 ft. Maybe I just need an extention rj 45 cable?

Can i use this to upgrade the firmware on my apc smt 750?