3Com 3C13886 Installation Guide - Page 84
II. Connecting interface cable of 4-port,
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3Com Router Module Guide Chapter 3 Multifunctional Interface Modules z If the port on the network device to be connected has a 120-ohm port, use a 75-ohm to 120-ohm adapter, or use a 120-ohm cable instead. 2) When using a 120-ohm balanced twisted pair cable, z Connect its RJ-45 connector to the RJ-45 port on the device to be connected directly, if cable extension is not needed. z Connect its RJ-45 connector to a network interface connector and then the other end of the network interface connector to the network device to be connected through a 120-ohm E1 trunk cable, if cable extension is needed. DB-15 Router RJ-45 RJ-45 Network devices such as DDN Network interface connector 120-ohm balanced twisted pair 120-ohm E1 trunk cable Figure 3-46 Extending an 120-ohm balanced twisted pair cable Step 4: Power on the Router, and check the LEDs of the corresponding slot on the front panel: ON means that the MIM is operating normally and OFF means that the POST of the MIM has failed. In the latter case, please contact your agent; Step 5: Check the behavior of the LINK LED on the module panel. It is OFF when fault has occurred on the link and signal is out of synchronization. In this case, please check the link. II. Connecting interface cable of 4-port Step 1: Select the appropriate cable and cable according to type of the port on the remote device, and set DIP switches of module correctly; z If the resistance of the port on the device to be connected is 75-ohm, select a 75-ohm E1 non-balanced coaxial cable and a 75-ohm 4E1 conversion cable, and set all the DIP switches on the 4E1/4E1-F module to "ON" (that is, the port resistance is 75-ohm). z If the resistance of the port on the device to be connected is 120-ohm, select a 120-ohm balanced twisted pair cable and a 120-ohm conversion cable, and set all the DIP switches on the module to "OFF" (that is, the port resistance is 120-ohm). Step 2: Plug the DB-25 connector of the conversion cable into a DB-25 port on or module, and tighten the screws; Step 3: Connect the DB-15 connector of the conversion cable to the cable, making sure of wire sequence of the connector; 3-40