Chapter 1. Introduction61202156L2-1A TDU 120e User Manual 1-3Standard Features in the TDU 120eThe following list describes the standard features in theenhanced TDU 120e.• A single T1 interface.• An Nx/DBU V.35 port and a DS-1 (PBX) interface.• An inband communication channel requiring only 8kof bandwidth from a single DS0.• One option slot to house option modules with up tofour additional ports, including voice and data.• Allows mix of port types to meet the data interface re-quirements.• Easy configuration capabilities using simplisticmenus displayed on a terminal or computer connect-ed to the control port on the rear of the unit or thecraft port on front of the unit.• 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 theNx56/64 or DS-1 ports, internally, or from a second-ary interface.• QRSS; 511 test patterns using Nx option.• Extensive self-testing and monitoring provides assur-ance of proper operation.• SNMP, Telnet, and T-Watch PRO management viaSLIP or 10-BaseT• Ability to proxy for “agentless” units• Enhanced terminal mode• Fractional T1 loopbacks as defined in Annex B ofANSI T1.403-1995• Software configurable long-haul or short-haul DS-1port• External alarm connector• External alarm monitor
