OS-LS-6224U Chassis. Fast Ethernet L2+ stackable fixed configuration chassis in a 1U form factor consisting of 24 ports 100Base-X SFP, two 10/100/1000 RJ-45 ports and two combo ports. Combo ports consist of two additional 10/100/1000 RJ-45 and two mini-GBIC ports. The 24 SFP ports accepts industry standard 100Base-X optical transceivers which are sold separately. MiniGBIC ports support Gigabit or 100FX Ethernet MiniGBIC (SFP) optical transceivers, which can be ordered separately. Stacking capability utilizes the two 10/100/1000 RJ-45 ports and standard Ethernet cabling. Optional backup power supported. Optional items can be purchased/ordered separately. Comes with 19" rack mounts, RJ-45 to DB-9 adaptor, and country specific power cord.