The ADTRAN TSU ACE is a low-cost, full-featured T1/FT1 data service unit/ channel service unit (DSU/CSU). The TSU ACE provides an interface between T1 or Fractional T1 service and the end user's data terminal equipment (DTE) for applications such as LAN-to-LAN bridging, Frame Relay circuit termination and video-conferencing. The TSU ACE provides access to traditional dedicated point-to-point T1 services as well as network termination for Frame Relay.