Chapter 2. Installation2-6 TSU 120 User Manual 61202129L1-1DSX-1 (PBX) InterfaceThe DSX-1 Interface provides a short haul T1 for a PBX or otherequipment. This port complies with ANSI T1.102.DSX-1 Test InterfaceThe IN and OUT test jacks for the DSX-1 interface provide intru-sive test capabilities for the T1 connecting the TSU 120 to thePBX or other customer premise equipment. By connecting tothese jacks with test equipment, the DSX-1 connection will bebroken, and the test equipment will be terminating the DSX-1connection from the PBX.The T-MON test jack provides a DSX monitor access jack fornon-intrusive monitoring of the T1 connecting the TSU 120 tothe PBX or other customer premise equipment. When con-nected to this jack, the test equipment should be configured fora DSX MON termination.Chain Port InputThe chain port input provides an EIA-232 input from a PC or amodem for control of the TSU 120. You can also use it as a chaininput from another TSU 120 or the TSU 100. For more informa-tion see the Wiring section in Appendix C, on page C-1.Chain Port OutputThe chain port output provides an EIA-232 output to chain con-trol to other TSUs. For more information see the Wiring sectionin Appendix C, on page C-1.10BaseT Interface (TSU 120e only)The 10BaseT interface provides the LAN interface for manag-ing the TSU 120 with SNMP or T-WATCH Pro. For more infor-mation see the Wiring section in Appendix C, on page C-1.
