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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
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Are the interface cables long enough to reach the chassis from the network access point?
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How will you manage the user interface cables at the chassis? Are there cable management
brackets on the chassis that you can use to organize the cables? Will the cables be routed to the
chassis from above (overhead bus bars) or below (raised floors)?
• Will cables be routed between different rooms or from other areas of the site into the installation
room? If so, are there any special issues to consider as you plan these cabling runs? For example:
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Do the cables run between different floors?
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Are there any obstacles in the cable route (such as a firewall that the cable must be routed around)?
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Will the cables be routed through overhead ceiling tiles? If so, have you planned the route and
determined which ceiling tiles need to be removed to provide access?
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Will the cables be routed beneath raised floors? If so, have you planned the route and
determined which floor tiles need to be removed for access?
• If you need to plan for high availability of the system, consider the following:
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Can cables be routed through different areas of the site to reduce the possibility of a single
point of failure?
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For installation in different rooms, the distance between each chassis and the Cat6509 switches
must be less than 328 feet (100 meters).
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Are additional PLIM user interface cables required for redundant configurations?
• Are there electromagnetic interference (EMI) issues to consider? For example, will power cables be
routed through the same conduits as user interface cables, and could it cause interference?
• Consider how to manage cables at the chassis (see the “Cable Management” section on page 3-20).
Power Cables
Following is a list of considerations for the multishelf system power cables:
• Are power cords long enough to reach the chassis from the power outlet?
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AC-powered chassis are shipped with power cords that are 13 feet (4 meters) long. If the distance
from the chassis to the power outlet is greater than this, we recommend that you move either the
power outlet or chassis to accommodate the supplied power cord. See the power section in the
LCC or FCC site planning guide for cable details.
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DC input power cables are not shipped with the chassis. These cables are available from any
commercial vendor. For details on DC input power cables, see the power section in the LCC or
FCC site planning guide.
• Power outlets should be easy to access. If the outlets are beneath the floor, which tiles need to be removed
to access the outlets? Or will you drill a hole in the hole and snake the power cords through the hole?
• Consider the routing of power cables from the power sources to each chassis:
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How will power cords be routed to the power outlets?
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Will cables be routed above the chassis or beneath raised floors?
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How will you handle excess cable?
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Does the chassis have vertical cable troughs and cable management brackets? If so, you can use
them to organize the power cables and keep them neat.