The ONS 15454 is powered using -48 VDC power. Negative, return, and ground power terminals are
accessible on the backplane.
Note: In this chapter, the terms "ONS 15454" and "shelf assembly" are used interchangeably. In the
installation context, these terms have the same meaning. Otherwise, shelf assembly refers to the physical
steel enclosure that holds cards and connects power, and ONS 15454 refers to the entire system, both
hardware and software.
Install the ONS 15454 in compliance with your local and national electrical codes:
United States: National Fire Protection Association (NFPA) 70; United States National Electrical
Code
•
Canada: Canadian Electrical Code, Part I, CSA C22.1•
Other countries: If local and national electrical codes are not available refer to IEC 364, Part 1
through Part 7
•
Rack Installation
The ONS 15454 is mounted in a 19- or 23-in. (482.6- or 584.2-mm) equipment rack. The shelf assembly
projects five inches (127 mm) from the front of the rack. It mounts in both Electronic Industries Alliance
(EIA) standard and Telcordia-standard racks. The shelf assembly is a total of 17 inches (431.8 mm) wide
with no mounting ears attached. Ring runs are not provided by Cisco and might hinder side-by-side
installation of shelves where space is limited.
The ONS 15454 measures 18.25 inches (463.5 mm) high, 19 or 23 inches (482.6 or 584.2 mm) wide
(depending on which way the mounting ears are attached), 12.018 inches (305.2 mm) deep for standard door
and 13.810 inches (350.7 mm) for deep door. You can install up to four ONS 15454 shelves in a seven-foot
(2133.6 mm) equipment rack. The ONS 15454 must have one inch (25.4 mm) of airspace below the installed
shelf assembly to allow air flow to the fan intake. If a second ONS 15454 is installed underneath the shelf
assembly, the air ramp on top of the lower shelf assembly provides the air spacing needed and should not be
modified in any way. Figure 1-1 shows the dimensions of the ONS 15454.
Note: A 10-Gbps-compatible shelf assembly (15454-SA-ANSI or 15454-SA-HD) and fan-tray assembly
(15454-FTA3, 15454-FTA3-T, or 15454-CC-FTA) are required if ONS 15454 XC10G and ONS 15454
XC-VXC-10G cards are installed in the shelf.
Figure 1-1: Cisco ONS 15454 ANSI Dimensions
ONS_15454_Reference_Manual_R8.5.x_--_Shelf_and_Backplane_Hardware
Rack Installation 5
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