3Com VCX V7122 SIP VoIP Gateway User Manual 31Figure 11 Pinout of RJ-48c Trunk Connectors1 2 3 4 5 6 7 8 3, 6, 7, 8not connectedbody = shield1 = Rx Ring2 = Rx Tip4 = Tx Ring5 = Tx TipRJ-48c Connector and PinoutInstalling the Ethernet ConnectionWhen initializing (connecting the VCX V7122 to the network for the first time) use a standardEthernet cable to connect the network interface on your computer to a port on a networkhub/switch. Use a second standard Ethernet cable to connect the VCX V7122 to another porton the same network hub/switch.For normal use, connect a standard Category 5 network cable to the Ethernet RJ-45 port(and the other as optional redundancy/backup). Connect the other end of the Category 5network cables to your IP network. The Ethernet connectors (labeled Ethernet 1 andEthernet 2) are wired according to Figure 12.Note that for redundant operation it is recommended to connect each of the Ethernetconnectors to a different Switch.Figure 12 Pinout of RJ-45 Connectors1 2 3 4 5 6 7 8RJ-45 LAN Connector and Pinout4, 5, 7, 8not connected1 = Tx+2 = Tx-3 = Rx+6 = Rx-Connecting the Power SupplyConnect the VCX V7122 to the power supply using one of the following methods:Connecting the AC Power SupplyWhen using a single AC power cable:Attach one end of the supplied 100/240 VAC power cable to the rear AC socket and connectthe other end to the correct grounded AC power supply.When using a dual AC power cable:Attach one end of the supplied 100/240 VAC power cables to the rear AC sockets andconnect the other end to a separate grounded mains circuits (for power source redundancy).
