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2. Use a manual Phillips torque screwdriver to attach the bottom-support rail to the rack using four M6 x
19 mm or 12-24 x 3/4 inch screws and tighten each screw to 40 in. lbs (4.5 N.m) of torque.
Figure 24. Attaching Bottom-Support Rails to a Rack
1. Adjustable bottom-support rails
2. M6 x 19 mm (or 12-24 x 3/4 in.) Phillips screws 3(6 to 8 per rail)
3. Cross bar aligned to the lower back of both rails
4. M4 x 8 mm screws (1 for each of two ends of the cross bar)
3. Repeat Steps 1 and 2 to attach the other bottom-support rail to the rack.
Note : Make sure that the two bottom-support rails are level with one another. If they are not level,
adjust the higher rail down to the level of the lower rail.
4. Align the crossbar to the lower back of the two bottom-support rails and use two M4 x 8 mm screws to
attach it to each rail (one screw for each rail). See Callouts 3 and 4 in Figure 24 on page 57 for the
placement of the crossbar and its screws.
When the bottom-support rails are installed at the lowest possible RU and are level, you are ready to
install the chassis in the rack or cabinet.
Attaching Bottom-Support Rails to a Four-Post Rack
Before you begin
Before you can install the bottom support rails for the chassis, you must do the following:
• Verify that a four-post rack or cabinet is installed and secured to the concrete subfloor.
• If any other devices are stored in the rack or cabinet, verify that they are located below where you plan
to install the switch. Also, verify that lighter devices in the same rack are located above where you plan
to install this switch.
• Verify that the bottom-support rails kit is included in the switch accessory kit (Unpack and inspect the
chassis shipment for completeness and damage).
Chapter 3. Installing the IBM c-type SAN Device 57
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