3Com 3C13886 Installation Guide - Page 55

3Com Router Module Guide Chapter 3 Multifunctional Interface Modules z A network interface connector and then the peer device using another E1 120-ohm balanced twisted pair cable, if the resistance of the port to be connected is 120-ohm, and there is a need to extend the cable, as illustrated in the following figure. DB -15 Router RJ-45 RJ-45 Voice Device 120-ohm balanced twisted pair cable Network interface 120-ohm E1 connector trunk cable Figure 3-15 Extending E1 120-ohm balanced twisted pair cable z The peer device using a 75ohm-to-120ohm adapter, if the resistance of the peer device is 75-ohm; Step 3: Power on the Router, and check the LEDs of the corresponding slot on the front panel: ON means Router E1 Voice Module is operating normally and OFF means the POST of Router E1 Voice Module has failed. In the latter case, please contact your agent; Step 4: Check the status of the LINK LED on the Router E1 Voice Module panel. It is OFF when fault has occurred to the link. In this case, please check the link. 3.3 Router T1 Voice Module 3.3.1 Introduction Router T1 Voice Module can handle dense signals in VoIP systems. It can implement the VoIP function over T1 lines. Router T1 Voice Module is structured in the form of board plus daughter card. It provides a CT1/PRI port, allowing the access of 24 channels of voice signals. 3.3.2 Appearance The appearance of Router T1 Voice Module is shown in the following figure: 3-11