Cisco CRS Carrier Routing System Multishelf System Site Planning Guide
Space Planning
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Table of Contents

Space Planning

Planning the Layout of the Multishelf System

Basic FCC Floor Plans

Fabric Card Chassis Footprint

Aisle Spacing and Maintenance Access Floor Plan

Planning for Future Expansion

Chassis Floor Loading

Anchoring the Chassis to the Floor

Space Planning

This chapter provides information to help you determine where to install the multishelf system and to plan and prepare the site for the installation of the FCC. It describes the amount of space required for the FCC and provides information about floor loading and drill hole locations for securing the chassis to the floor. This chapter contains the following sections:

Fabric Card Chassis Footprint

Aisle Spacing and Maintenance Access Floor Plan

Planning for Future Expansion


Note The Cisco CRS multishelf system consists of LCCs and FCCs. This site planning guide describes the FCC and the multishelf system. See the Cisco CRS Carrier Routing System 16-Slot Line Card Chassis Site Planning Guide for specific LCC site planning information.


Planning the Layout of the Multishelf System

This section describes the issues to consider as you plan the floor plan to use for your multishelf system.

While no one floor plan is better than another, some floor plans might be better suited to the installation site and to your system needs. For example, a side-by-side layout might be better than one in which the chassis are located across the aisle from each other. And for installations in which system availability is important, you might need to install the chassis in different rooms or on different floors.

The aisles between equipment rows should be wide enough to allow the LCCs or FCCs to be pulled out into the aisle, turned around, and maneuvered into position.

Basic FCC Floor Plans

As part of the site planning process, you must decide where to install the FCC. As you consider where to install the system, consider the following:

  • Installation site floor plan must include:

Enough free space for the chassis (see the “Fabric Card Chassis Footprint” section).

Adequate space for airflow and enough room to access chassis components for maintenance (see the “Aisle Spacing and Maintenance Access Floor Plan” section).

Additional free space for potential expansion of the system (see the “Planning for Future Expansion” section).

Fabric Card Chassis Footprint

Figure 2-1 is a top view of the FCC footprint (with front and rear doors and cosmetics installed).

Figure 2-1 Top View of FCC

 

 

1

23.6 in. (60 cm), width of chassis

2

41 in. (104 cm), depth of chassis with front and rear doors

Aisle Spacing and Maintenance Access Floor Plan

Make sure that enough space exists at the installation site to install the FCC and allow sufficient airflow. The floor plan must also provide enough room to access chassis components for maintenance (for example, to remove fan trays, power modules, cables, and air filters). We recommend 48 in. (127 cm) clearance to install the chassis and 36 in. (91 cm) clearance to allow for access to chassis components. Figure 2-2 shows a typical floor plan.

Figure 2-2 FCC Floor Plan

 

Cisco provides two layout templates to help you determine where to install the system:

  • Mylar template (CRS-LCC-FLOORTEMP) shows the chassis footprint, door swings, and required clearances to remove and replace chassis components. Use this template to plan the aisle space required for the installation and maintenance of the FCC.
  • Aluminum plate template (CRS-LCC-DRILLTEMP) shows the chassis footprint and the pattern of holes that must be drilled into the floor to secure the chassis to the floor. See the “Anchoring the Chassis to the Floor” section.

Planning for Future Expansion

When planning the installation of the multishelf system, consider potential expansion of the system.

When planning for expansion, consider:

  • Floor space for additional chassis
  • Power and cooling requirements for additional chassis
  • Cable management for additional optical array cables and user interface cables (on PLIMs)
  • System management for the larger systems

Chassis Floor Loading

Whether you plan to install the chassis on slab concrete or raised floors, ensure that the floor is level and that it can support the weight of the chassis. Table 2-1 lists the chassis weight and floor loading for the FCC.

 

Table 2-1 Chassis Weight and Floor Loading

Chassis Configuration
Chassis Weight
Floor Loading

Chassis with cards,
no cosmetics and doors

1585 lb (719 kg)

335 lb/sq ft
0.164 kg/sq cm

Chassis with cards and cosmetics (doors, panels, and grilles)

1695 lb (769 kg)

359 lb/sq ft
0.175 kg/sq cm

If you have 3-phase AC Delta or AC Wye at your equipment, a Cisco CRS 3-phase AC power distribution unit (PDU) will be required to convert 3-phase AC input power to single-phase AC input power for the power shelf. Table 2-2 lists the weight of two individual PDUs required to be installed for system redundancy, including cables and chassis-mounting brackets.

 

Table 2-2 Power Distribution Unit Weight

PDU Type
Weight

CRS-FCC Delta PDU (including two PDUs, cables and brackets)

86 lb (39 kg)

CRS-FCC Wye PDU (including two PDUs, cables and brackets)

60 lb (27 kg)

For more information about the Cisco CRS 3-Phase AC PDU, refer to the Cisco CRS 3-Phase AC Power Distribution Unit Installation Guide .

Anchoring the Chassis to the Floor

The FCC must be anchored (bolted) to the floor at the installation site. To assist with this task, an aluminum plate template (CRS-LCC-DRILLTEMP) can be ordered. The template provides drill bushings for the chassis mounting-hole locations.

The template shows the chassis footprint and the pattern of holes that must be drilled into the floor for the mounting brackets that secure the chassis to the floor (see Figure 2-3). The template includes several mounting-hole locations:

  • Primary—Use these mounting-hole locations whenever possible.
  • Secondary—Use these locations if it is not possible to use the Primary locations.
  • Aux—Use these locations when there is an obstruction at both the primary and secondary locations (for example, rebar in a concrete floor or a structure beneath a raised floor). For this situation, Cisco provides an orderable inrigger kit (CRS-FCC-ALTMNT) that attaches to the chassis to anchor the chassis to the floor. See the Cisco CRS Carrier Routing System Fabric Card Chassis Unpacking, Moving, and Securing Guide for instructions on installing the inrigger kit.

Slab Concrete Floors

An installation kit is available from Hilti Corporation for installation of the Cisco CRS chassis on concrete floors. The kit (Hilti part number HSL-1 M12/0-65-80, Item #00374627) contains instructions, fasteners, and washers. In addition, a non-standard 18-mm concrete drill (Hilti part number) is required to install the studs. This drill can be ordered from Hilti.

Raised Floors

If you plan to install the FCC on a raised floor or you need to reinforce the floor to support the weight of the chassis, be sure to follow the instructions from the raised-floor manufacturer.

Figure 2-3 shows the drill hole template with the mounting hole locations, which are marked in each of the four corners of the template.

Figure 2-3 Drill Hole Template

 

 

1

Primary LCC/FCC mount location (preferred)

3

Secondary LCC/FCC mount location

2

Aux LCC mount location (requires CRS-16-LCC-ALTMNT kit)

4

Aux FCC mount location (requires CRS-FCC-ALTMNT kit)