Problems Connecting Cisco 2950 & powerConnect 6224F

Hi Team

I have one problem of connection.

I try connect a 6224F (SFP 1 Gb) to a Cat 2950 (Gbic 1 GbaseSX) using a dark fiber but nothing happens.

Change transceiver, move to another ports of 6224 but nothing happens

Not use vlan , trunk or port channel, only basic connectivity

The Transceiver that use on Pw6224F are P/N  FTLF8519P2BNL-(FC), I have a suspect is it transceiver ok?

Regards.

PS: After I Connected the Cat 2950 to a Cisco 3750X (close to 6224F) using the same dark Fiber and same configuration and and ping countinuously function properly.

This C3750X and the 6224F are connect by a channel trunk to 10 Gbps and function properly.