How can I get a connection via Gbic between these differents switches. Both switches are not using Vlan but are use like a hub.
Which config should I enter into both catalyst. (full duplex, negociation...)
No the gbic on the c3548 isn't 100/1000, it is only 1000 Mbps. So you never will be able to connect the bs450 to the C3524, if you not buy an gbic 1000 Mbps to the bs450.
Should not put autonegotiate in both sws and no full duplex. Set same speed in both.