The WS-X4506-GB-T module is a six-port alternately-wired 10/100/1000BASE-T Cisco Catalyst 4500 series Power over Ethernet (PoE) 802.3af or 1000BASE-X SFP. When installed in a 4500 switch running CatOS, the show module command displays the module status as unknown.
The WS-X4506-GB-T line card needs at least IOS 12.2(20)EWA to be recognized. The recommended Cisco IOS version is 12.2(25)EWA6.
If a Gigabit Ethernet is used without using the POE features and running CatOS, the WS-X4306-GB (6-port 1000BASE-X (GBIC) Gigabit Ethernet) line card for which the minimum CatOS needed is 4.5(8) and recommended is 8.4(10)GLX.