For SDH and SONET based networks, Loop Telecom's line of multiplexers combine digital access interfaces into optical lines for convenient transport and switching. Our popular O9500 and O9400R SDH Multiplexer or SONET Multiplexer are rack-based with removable plug-in cards for customization to your site's needs. High speed cards are available at STM-1/4/16 speeds (OC-3/12/48) and include several options such as E3 or DS3 and Ethernet over SDH (EoS). Low speed cards in the O9500 provide access for data, voice, IP/Ethernet, and teleprotection. Furthermore, the O9400 and O9500 support fully non-blocking cross-connect at VC11/VC12/VC3/VC4 levels and full add/drop capabilities (ADM), important features for some applications.