The SHDSL 2w4w NTU provides an interface between the SHDSL network and the user Data Terminal Equipment (DTE), for applications such as LAN-to-LAN bridging, Frame Relay circuit, and PABX termination. The SHDSL 2w4w NTU can be used as either of the following:

• Remote unit to the ADTRAN Total Access 3000 multiservice platform, or
• Pair of units in a point-to-point limited distance campus configuration, with one SHDSL 2w4w NTU configured to “LT” mode