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Chapter 1. Introduction
61202156L2-1A TDU 120e User Manual 1-3
Standard Features in the TDU 120e
The following list describes the standard features in the
enhanced TDU 120e.
• A single T1 interface.
• An Nx/DBU V.35 port and a DS-1 (PBX) interface.
• An inband communication channel requiring only 8k
of bandwidth from a single DS0.
• One option slot to house option modules with up to
four additional ports, including voice and data.
• Allows mix of port types to meet the data interface re-
quirements.
• Easy configuration capabilities using simplistic
menus displayed on a terminal or computer connect-
ed to the control port on the rear of the unit or the
craft port on front of the unit.
• Two programmable configuration maps that define
the 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 the
Nx56/64 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 via
SLIP or 10-BaseT
• Ability to proxy for “agentless” units
• Enhanced terminal mode
• Fractional T1 loopbacks as defined in Annex B of
ANSI T1.403-1995
• Software configurable long-haul or short-haul DS-1
port
• External alarm connector
• External alarm monitor