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Chapter 2. Installation
61202156L2-1 TDU 120e User Manual 2-7
DS-1 (PBX) Interface
The DS-1 interface provides a T1 for a PBX or other equip-
ment. This port complies with ANSI T1.102. It can be soft-
ware configured for either long-haul or short-haul.
Control In Port
The control port input provides an RJ-45 input from a PC
or a modem for control of the TDU 120e. You can also use
it as a chain input from another TDU 120e or TSU 100. For
more information, see Appendix B.
Craft Port
The craft port provides the same functionality as the Con-
trol Port Input. Both the craft port and the control port in-
put may be connected simultaneously, but only one port
may be active at a time. For more information, see
Appendix B.
Control Out Port
The chain port output provides an RJ-45 output to chain
control to other TDUs or to TSUs. For more information
see Appendix B.
10BaseT Interface
The 10BaseT interface provides the LAN interface for
managing the TDU 120e with SNMP or T-Watch PRO. For
more information, see Appendix B.
External Alarm Connector
The external alarm connector provides the capability of
connecting an external alarm device to the TDU 120e. The
alarm relay will activate on any alarm. The relay will re-
main activated until the automatic cut-off (ACO) button
on the front panel is pushed. For more information, see
Appendix B.