Chapter 1. Introduction61200.129L1-1 TSU 120 User Manual 5Features of the TSU 120The TSU 120 offers the following features:• A DS1 network interface, a DSX-1 PBX interface, andan Nx56/64 DTE serial interface port• An inband communication channel requiring only 8K of bandwidth from a single DS0• A slot to house option modules with up to fouradditional data ports including voice• Allows mix of port types to meet the data interfacerequirements• Easy configuration capabilities using simple menusdisplayed in a liquid crystal display (LCD) windowoperated by a front panel keypad• Two programmable configuration maps that definethe bandwidth allocation between data ports• Data drop and insert, as well as full drop and insert• Flash memory for software updates• Timing is selectable from the network, from theDSX-1 interface, from the Nx56/64 DTE port,internally, or from a secondary interface• QRSS; 511 test patterns• Extensive self test and monitoring provides assur-ance of proper operation• Manageable by ADTRAN T-Watch or SNMP (withADVISOR)• A terminal mode for configuration using a VT-100type terminal
