3Com Router 5000 and Router 6000 v2.41Module GuideChapter 3Multifunctional Interface Modules (Router 5000)3-11z A network interface connector and then the peer device using another E1120-ohm balanced twisted pair cable, if the resistance of the port to be connectedis 120-ohm, and there is a need to extend the cable, as illustrated in the followingfigure.Router VoiceDeviceDB -15Network interfaceRJ-45 RJ-45120-ohm balanced 120-ohm E1trunk cabletwisted pair cable connectorFigure 3-15 Extending E1 120-ohm balanced twisted pair cablez The peer device using a 75ohm-to-120ohm adapter, if the resistance of the peerdevice is 75-ohm;Step 3: Power on the Router, and check the LEDs of the corresponding slot on thefront panel: ON means Router E1 Voice Module is operating normally and OFF meansthe POST of Router E1 Voice Module has failed. In the latter case, please contact youragent;Step 4: Check the status of the LINK LED on the Router E1 Voice Module panel. It isOFF when fault has occurred to the link. In this case, please check the link.3.3 Router T1 Voice Module3.3.1 IntroductionRouter T1 Voice Module can handle dense signals in VoIP systems. It can implementthe VoIP function over T1 lines and transmit voice and data signals over T1 lines at thesame time.Router T1 Voice Module is structured in the form of board plus daughter card. Itprovides a CT1/PRI port, allowing the access of 24 channels of voice signals.3.3.2 AppearanceThe appearance of Router T1 Voice Module is shown in the following figure:
