Cisco Part # 72-3383-01 Flat, light Blue cable Genuine Cisco RJ-45 on one end, and DB-9 Serial Connection on the other end Fits every Router and Switch Using RJ 45 to DB 9 Connections Including: Cisco Series UBRxx 904, 905, 924, & 925 1600, 1700 2500, 2600 3600 4500 7200 Catalyst Series: 1900 2900,2950 3500 4500 5500 6500 Retails for over $20 each