3Com 100 TX User Manual

Using the Redundant Power System 2-73 Carefully remove the transceiver interface module from its shippingcontainer.4 Slowly insert the module into the slot, being careful not to damage any ofthe components or connecting pins.The module will slide into the hub following the tracks in the slot. Thelettering that shows the module type must be positioned on top of theconnector openings when the module is in place.5 Push the module all the way in until the connector is firmly seated.6 Tighten the two thumbscrews to secure the module in place.7 Reattach the power cord to the hub.8 Attach the proper cable to the module to make the desired networkconnection.The ACTIVITY LED for the thirteenth port on the hub’s front panel should begreen, indicating the module is correctly installed.Using theRedundantPower SystemTo ensure fail-safe operation and constant power to the hub stack, you canuse the 3Com Redundant Power System (RPS) (part number 3C565047).The RPS must be purchased separately.The RPS, which is rack-mountable, comprises two load-sharing bulk powersupplies fed by two independent AC lines. Either power supply alone cansupport a stack of up to four hubs. Eight hubs in a stack will require two RPSunits, one mounted on the bottom of the stack and the other on the top.Redundant fans protect against possible failures caused by overheating.The RPS front panel provides LED indicators for monitoring temperature aswell as input and output status. In the event of a failure in one of thesupplies, an alert is automatically sent to the management console.