ferbke

Hello I have 2 Dlink DGS3620-switches connected through fibre. The fibre modules used are dem-431XT. Everything works perfect. Now I want to replace one DGS3620 with a DGS1210 so I configured the DGS1210 the same way. The problem is that the DGS1210 doesn't "see" the fibre. The fibre-module fits perfecly. Any ideas? Thanks Ferb