Cisco Systems CRS-1 manual Routing System Line Card Chassis Unpacking, Moving, and, Securing Guide

Chapter 3 Technical and Environmental Specifications

Equipment Rack Specifications

Table 3-2 8-Slot Line Card Chassis and Equipment Rack Specifications (continued)

Equipment Rack Specifications (continued)

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.
	• ESW 27 racks are equipped with horizontal mounting rails
	already installed. Place the chassis on these rails.
	• For other types of racks, 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 the Cisco CRS-1 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.
Mounting screws	• 48 screws for each chassis, 12 screws in each of 4 vertical rails,
	installed in holes with tick marks
	• No. 10-32 screws (provided with the chassis)
	• No. 10-24 or M5 screws can be used if rack thread pitch allows.
	Note If you plan to use mounting screws other than the ones
	shipped with the chassis, make sure that the screws are made
	of stainless steel or a hard alloy. Do not use screws made of
	soft alloy steel.
Compliance	Make sure that the rack complies with all appropriate standards for
	your geographical area—for example, NEBS Seismic Zone 4
	(GR-63-CORE, Sections 4.4.1 and 4.4.2).
	Note The 8-slot chassis has passed Cisco Zone 4 seismic testing in
	an ESW 27 rack (part number F-01941-01).
Additional Rack Considerations
Interface cables	When choosing a rack, consider cabling needs (chassis front). Allow
	at least 95 lb (43.1 kg) weight for each chassis for cables.

Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide

OL-5802-06 3-5