Cisco CRS-1 - Manual (Page 46)

3-6
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-09
Chapter 3 Technical and Environmental Specifications
Equipment Rack Specifications
Rack Anchoring
General considerations • The rack must be bolted to the floor. For more information, see
the Cisco CRS Carrier Routing System Line Card Chassis
Unpacking, Moving, and Securing Guide.
• Consider floor and overhead anchoring requirements for the site,
and size and load capacity of anchors and floor structure.
• Make sure that floor mounting bolts are accessible, especially if
annual retorquing of bolts is required.
Floor mounting holes • Outrigger L-brackets: Depends on chosen rack
• Internal frame holes: Depends on chosen rack
Chassis Clearances
Two chassis in a single rack 0.5-in. (1.27 cm) between chassis for horizontal shelf brackets
Front and rear of chassis 40.4-in. (102.6 cm) for chassis installation
36-in. (91.4 cm) for service access and airflow
Inlet and exhaust openings on
chassis and power modules 6-in. (15.2 cm)
Top of chassis No overhead clearance for a single chassis. Two chassis in a rack
requires 0.5-inch (1.27 cm) between chassis for mounting rails.
Mounting Rails and Hardware
Rail openings (aperture) • 17.75 in. (45.1 cm), side to side
• 22.8 in. (57.9 cm), front to back (adjustable or fixed)
Horizontal mounting rails The equipment rack should contain horizontal mounting rails to
place the chassis on. The mounting rails, which must be able to hold
at least 650 lb (294.8 kg), support the weight of the chassis.
• A set of brackets is included in the chassis installation kit, which
is available as an option (CRS-8-INSTALL-KT=). Install these
brackets and place the chassis on them. For details, see Cisco
CRS Carrier Routing System Line Card Chassis Unpacking,
Moving, and Securing Guide.
Note In addition to supporting the chassis, the mounting rails are
also designed to space adjustable rack rails at 22.8-inches (front
to back) for chassis installation.
Mounting holes EIA standard mounting-hole spacing:
• 18.25-inches to 18.31-inches (46.36 to 46.51 cm),
center-to-center horizontal spacing
• 0.5 + 0.625 + 0.625-inches (1.27 + 1.59 + 1.59 cm),
vertical-hole-spacing pattern; repeats on 1.75-inch (4.45 cm)
pitch ETSI racks have mounting rails with EIA standard spacing.
Table 3-3 8-Slot Line Card Chassis and Equipment Rack Specifications (continued)