8 Lead Octal Cable 68PIN To 8 Male RJ45S Serial (Ref CAB-OCTAL-ASYNC= Cisco) HDDB68 Male to (8) RJ45 Male 10ft
CMB Part: [C11CAB-OCTAL-ASYNC=]

This is the cable you will need to connect your console sessions from a Cisco 2509 or 2511 router.  You will need one for a 2509 router and two for the 2511 router.