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Cable Routing Procedures for
Dell™ PowerEdge™ R815 Systems
A Dell™ Technical White Paper
Dell™
│
Datacenter Infrastructure Engineering
By Chris Kitten and Jose L. Flores
July 2010
Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
THIS WHITE PAPER IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN TYPOGRAPHICAL
ERRORS AND TECHNICAL INACCURACIES. THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS
OR IMPLIED WARRANTIES OF ANY KIND.
© 2010 Dell Inc. All rights reserved. Reproduction of this material in any manner whatsoever without the express written permission of Dell Inc. is strictly forbidden. For more information, contact Dell.
Dell
, the
DELL
logo, the
DELL
badge, and
PowerEdge
are trademarks of Dell Inc.
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Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
Contents
Table of Figures
Page 1
Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
Introduction
This white paper covers recommended cable routing procedures for Dell™ PowerEdge™ R815 systems in the following racks:
• PowerEdge™ 4820/4220/2420
• PowerEdge™ 4210/2410
If you are using the optional CMA, following these procedures will allow you to extend the system from the rack for service without powering down or disconnecting the cables. If you are not using the
CMA, following these procedures will ensure secure attachment and strain relief of the cables behind the system. For guidelines on how to route cables within the rack, refer to the Dell
Best Practices
Guide for Rack Enclosure
white paper.
Section 1: Cabling a Dell™ PowerEdge™ R815 With a Cable Management
Arm (CMA)
This section details how to cable a PowerEdge™ R815 system using a CMA. If you are cabling the system without the optional CMA, refer to Section 2.
Follow the instructions contained in the
Rack Installation Guide
in the rail kit to install the server into the rack. Once installed, use these instructions to install the cables. All illustrations in the following sections were created using a PowerEdge™ R815 system.
NOTE: PowerEdge™ R815 systems are not compatible with previous generation rails and CMAs.
1.1
Connecting the CMA Cables to the System
Attach the CMA tray to the back of the rails as described in the
CMA Installation Instructions
provided in the CMA kit. Connect all applicable cables to the rear of the system and verify that all connections are secure. See Figure 1.
Figure 1: System with Cables Installed
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Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
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.
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Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
Figure 3: Routing the Cables Through the CMA
Figure 4: Left-Side Mounted CMA Installation
NOTE: Do not store excess cable slack inside the CMA. The cable may protrude through the CMA, thus causing binding and potentially damaging the cable.
Cables entering the CMA should have a small amount of slack to avoid cable strain when the CMA is extended.
KVM dongle placed inside the basket for Left-Side Mounting.
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Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
1.5
Right-Side Mounting Instructions
1.
Install the CMA on the rear right 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.
3.
If the cable bundle includes a keyboard, video, and mouse (KVM) dongle, the cable may be too short for the dongle to be placed in the CMA basket. Route the remainder of the cable beyond the dongle through the CMA. DO NOT secure the dongle to the outside of the CMA as this may restrict the ability of the CMA to support full extension of the rails without causing damage to the dongle. See Figure 5.
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
6.
(retracted) position.
Extend the system out of the rack to verify that there is sufficient slack in the cables on both ends of the CMA.
Figure 5: Right-Side Mounted CMA Installation
KVM dongle placed outside the basket for Right-Side Mounting.
Page 5
Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
Section 2: Cabling a Dell™ PowerEdge™ R815 System Without a CMA
NOTE: The CMA on Dell™ PowerEdge™ R815 systems is optional. Without the CMA installed, the system must be powered down and all cables disconnected before it can be removed from the rack.
2.1
Routing the Cables
1.
Connect all applicable cables to the rear of the system and verify that all connections are secure.
2.
Using the hook and loop straps supplied with the rail kit, bundle the cables and secure them to either the left or right CMA attachment brackets as described in the
Rack Installation Instructions
.
See Figure 6 for an example of data cables secured to the left CMA bracket and power cables
3.
secured to the right CMA bracket.
It is recommended that the cables be secured to the outer brackets, but cables may be secured to the inner brackets as well if desired.
Figure 6: Cable Routing Without a CMA
2.2
Removing the CMA Brackets for Shallow Racks
If you are installing the system into a shallow rack (less than 1 meter deep) and you will not be installing a CMA, the outer CMA brackets may be removed if necessary in order to allow the rails to fit properly into the rack. Remove the brackets by using a #2 Phillips screwdriver to remove the screws used to attach them to the rails as shown in Figure 7.
Figure 7: Removing the CMA Brackets for Shallow Racks
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Cable Routing Procedures for Dell™ PowerEdge™ R815 Systems
Section 3: Replacing a Power Supply on a PowerEdge™ R815 System With a
CMA
3.1
Replacing a Power Supply with a Left-Side Mounted CMA
1.
If the bottom power supply must be replaced, then remove the tray from underneath the CMA as described in the
CMA Installation Instructions
provided with the CMA kit. If the top power supply must be replaced, this step can be skipped.
2.
Swing the CMA to its service position.
3.
Disconnect the power cord from the power supply and disengage the strain relief.
4.
Replace the power supply.
5.
Plug in the power cord, re-engage the strain relief, replace the CMA support tray (if it was removed), and return the CMA to the closed (retracted) position.
3.2
Replacing a Power Supply with a Right-Side Mounted CMA
1.
If the bottom power supply must be replaced, then remove the tray from underneath the CMA as described in the
CMA Installation Instructions
provided with the CMA kit. If the top power supply must be replaced, this step can be skipped.
2.
Swing the CMA to its service position.
3.
Disconnect the power cord from the power supply and disengage the strain relief.
4.
Disconnect both CMA attachment housings from the rail as shown in Figure 8.
5.
While supporting the CMA with one hand, remove and replace the power supply with the other hand as shown in Figure 8.
6.
Reconnect the CMA attachment housings to the rail.
7.
Plug in the power cord, re-engage the strain relief, replace the CMA support tray (if it was removed), and return the CMA to the closed (retracted) position.
Figure 8: Replacing the Power Supply
CMA attachment housings have been disconnected.
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