Throughout the Metrodata product range there are numerous devices supporting OC-3/STM-1 155.52Mbps operation. We have the ATM Switching DSU's and CE DSUs that take non 155.52Mbps speeds such as E1, E2, E3 and DS-3 and tranport these over OC-3. We also have a wide range of STM-1 Fiber Converters and Fiber Optic Modems for STM-1 Electrical, Multimode SC, Single Mode Short and Long Haul SC. Added to this we have Ethernet over STM-1 and also the Metrolan1000 and Metrolan2000 which are GFP Mapping products that take 8 x E1/T1 plus 8 x 10/100BaseT Ethernet over an STM-1 SDH Network (With Metrolan supporting in addition 3 x E3/DS-3). 

Also the Metrodata AP (an Access Concentrator) that supports numerous physical interfaces and bitrates over STM-1 / OC-3.