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Using the
Redundant
Power System
3 Carefully remove the transceiver interface module from its shipping
container.
4 Slowly insert the module into the slot, being careful not to damage any of
the components or connecting pins.
The module will slide into the hub following the tracks in the slot. The
lettering that shows the module type must be positioned on top of the
connector 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 network
connection.
The ACTIVITY LED for the thirteenth port on the hub's front panel should be
green, indicating the module is correctly installed.
To ensure fail-safe operation and constant power to the hub stack, you can
use 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 power
supplies fed by two independent AC lines. Either power supply alone can
support a stack of up to four hubs. Eight hubs in a stack will require two RPS
units, 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 as
well as input and output status. In the event of a failure in one of the
supplies, an alert is automatically sent to the management console.
Using the Redundant Power System
2-7
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