I have several locations, head office in city A, branch office in city B, and 5 small offices in the same city (B). I have 2Mbps channel (leased line) between head office in city A and branch office in city B. In head office I have PBX. I need equipm...

I have 3 Catalyst 3524 switches. In first GBIC slots there are GigaStack GBICs and switches clustered. In two switches (in second slots) I have 1000Base-SX. Can I configure Gigabit EtherChannel between this cluster and Cat.6506?