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2-12 LightStream 2020 Installation Guide
Closing the Chassis
Note For ease of maintenance, route cables at the back of the LS2020 chassis in a way that enables
you to later remove any access card without disconnecting cables attached to other access cards or
fantails.
Closing the Chassis
Before applying system power, check the front and back of the system to ensure that all boards,
disks, blowers, bulkheads, filler panels, and covers are in place and secured firmly to the chassis
frame. When in place, these items form an enclosure that serves three important functions:
• Prevents exposure to hazardous voltages and currents inside the chassis.
• Confines electromagnetic interference (EMI) within the chassis, a requirement for meeting EMI
standards. Emissions from an LS2020 switch that is not fully enclosed may interfere with other
ambient equipment.
• Maintains the flow of cooling air through the chassis. Air flow disturbances can result in thermal
problems that may induce electronic component failures.
Caution Do not operate an LS2020 switch without first ensuring that all components removed in
the installation procedure are restored to their original position in the chassis. The LS2020 switch
must be operated properly at all times to avoid exposure to hazardous voltages, to confine EMI
radiation within the enclosure, and to maintain the proper flow of cooling air through the chassis.
Applying System Power
You canpower yourLS2020 switch with eitheran AC ora DC power tray.In addition, youcan equip
your LS2020 switch with an optional (redundant) power tray of like type (see Figure 2-5).
To power up an LS2020 switch, perform the following steps:
Step 1 If you have an AC-powered system, plug one end of the power cord into the power inlet on
the power tray andplug the other endinto a dedicated ACpower outlet. Notethat the power
inlet on the rear panel has a wire bail latch for securing the power cord to the chassis. Flip
the AC power switch to the left of the power inlet to the up position.
If your system is equipped with a second AC power tray, repeat Step 1 for this tray.
Step 2 If youhave aDC-poweredsystem, flipthe DCpowerswitch locatedon thepowertray panel
to the up position. (This step assumes that your LS2020 switch has already been connected
to a DC power source by qualified service personnel or a licensed electrician, as described
in the section “Wiring a DC-Powered System”).
If your system is equipped with a second DC power tray, repeat Step 2 for this tray.