3Com 3C13886 Installation Guide - Page 165
to-120-ohm adapter with BNC connectors
UPC - 662705478456
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3Com Router Module Guide Chapter 4 Figure 4-54 75-to-120-ohm adapter (with BNC connectors) Note: To extend E1 120-ohm balanced twisted-pair cables, use network connectors. E1 120-ohm balanced twisted pair cables, network connectors, and 75-to-120-ohm adapters are optional accessories; they are provided only when ordered. 4.16.5 Connecting the Interface Cable Caution: If outdoor cabling is involved, consider to install a special lightning arrester at the input end of the interface cable for better lightning protection. Before you connect a port, read its label carefully; a wrong connection can cause damages to the interface card and even the device. Step 1: Insert the DB-15 connector of the cable into the DB-15 port on the ROUTER 1-PORT E1 VOICE FIC and tighten the thumbscrews. Step 2: Connect the RJ-45 connector at the other end of the cable as follows: z If the impedance of the to-be-connected port is 120-ohm, and if cable extension is not required, Directly plug the RJ-45 connector into the port. z If the impedance of the to-be-connected port is 120-ohm, and if cable extension is required, Extend the E1 120-ohm balanced twisted-pair cable with a network connector, as shown in the following figure. 4-56