Dell PowerEdge Rack Enclosure 4220 - Manual (Page 5)

Cable Routing Procedures for Dell™ PowerEdge™ R715 Systems
Page 3
1.2 Routing the Power Cables Through the Strain Reliefs
After you have installed the tray and cables, route the power cables through the strain reliefs located
on the power supply handles as shown in Figure 2.
Figure 2: Routing Power Cables Through the Strain Reliefs
1.3 Routing the Cables Through the CMA
You can install the CMA on either the rear right or rear left side of the rails. Mounting the CMA on the
side that is opposite of the power supplies (left-side mount) is recommended; otherwise, the CMA
must be disconnected, to some extent, in order to remove the power supplies. Refer to Section 3 for
details on power supply replacement.
NOTE: For guidelines on how to route cables within the rack, refer to the Dell Best Practices Guide for
Rack Enclosures white paper .
1.4 Left-Side Mounting Instructions
1. Install the CMA on the rear left side of the rails by attaching both CMA housings to the attachment
brackets on the rails.
2. Route the cables through the CMA while avoiding twisting the cables. Use the hook and loop
straps on the CMA to secure the cables. See Figure 3.
3. For left-side mounting, if the cable bundle includes a keyboard, video, and mouse (KVM) dongle,
place the dongle inside the CMA basket.
4. Once you have routed all the cables through the CMA, dress the cable slack between the back of
the system and the entrance of the CMA using the tie wraps (shown in yellow in all illustrations)
provided in the CMA kit.
5. Clip off the excess length of material from the tie wraps. Make sure that the heads of the tie wraps
are positioned so as to avoid interference with adjacent systems. Return the CMA to the closed
(retracted) position.
6. Extend the system out of the rack to verify that there is sufficient slack in the cables on both ends
of the CMA.
See Figure 4 for an example of a completed left-side mounted CMA installation.