If your system has a combined A/B serial port, you can just plug a standard cable in and it will use serial port A.<BR><BR>More info here (Although i'm pretty sure his db9 -> db25 pinout is ...

I would bet money that the one from the 675/8 will not work. The cat 2950 series use the same rolled cable and rj-45 to DB9/DB25 as most fixed config routers and switches from Cisco.