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Cisco CRS-1 Carrier Routing System 16-Slot Multishelf System Site Planning Guide
OL-7422-04
Chapter 3 Multishelf System Planning
Multishelf System Cabling
Cable Management
As part of your site planning, you must determine how to manage cables at the chassis and along the
cabling runs. For example:
• Consider whether cables are routed to the chassis from above (through overhead cable ducts) or from
below (beneath a raised floor). In addition, consider whether different types of cables are routed
differently (for example, power cables from below and user interface cables from above).
• As you route cables on the chassis, in overhead cable ducts or below raised floors, be sure to group
and organize the cables in such a way that you can easily remove and reroute cables without affecting
other cables in the run.
Caution Do not put pressure on fabric cables and do not twist the cables, which can cause damage.
In addition, do not bend the cables beyond their minimum bend radius: 1.25 inches (3.17 cm) for a
90-degree bend or 2 inches (5.1 cm) for long term installation. Each cable has a strain-relief support
(or turn collar) with an attached strip of Velcro. For a 1.25-inch (3.17-cm) radius, the bend radius of the
cable should be no smaller than the arc of the cable turn collar.
• Determine how to handle cable slack (excess cable) so that it is not in the way. For example, you do
not want excess cable hanging into the aisle, where people can walk into it, or left in a pile on the
floor, where someone can trip over it.
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Can you coil the cable into a bundle and attach it to an overhead cable duct or the ceiling?
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Can you store excess cable above ceiling tiles or beneath a raised floor?
• Consider using these cable management features to manage cables at the chassis:
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Use cable management brackets and cable troughs to organize and route the cables. Horizontal
and vertical brackets are available and can be attached to the front and back of the chassis.
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Cable management brackets are shipped with attached Velcro straps. You can use these straps
to group and organize system cables into bundles. You can also insert the straps into the slots
on card handles to route the cables up or down the chassis and keep them organized and neat.
Custom Cables
The installation site may require custom cables designed for the facilities. Cisco can assist you in
planning custom cables.