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Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 1 Shelf Assembly Hardware
1.2.4 ONS 15454 ANSI Bay Assembly
1.2.4 ONS 15454 ANSI Bay Assembly
The Cisco ONS 15454 ANSI bay assembly simplifies ordering and installing the ONS 15454 ANSI
shelf because it allows you to order shelf assemblies preinstalled in a seven-foot (2,133 mm) rack. The
bay assembly is available in a three- or four-shelf configuration. The three-shelf configuration includes
three ONS 15454 ANSI shelf assemblies, a prewired fuse and alarm panel, and two fiber-storage trays.
The four-shelf configuration includes four ONS 15454 ANSI shelf assemblies and a prewired fuse and
alarm panel. You can order optional fiber channels with either configuration. Installation procedures are
included in the Unpacking and Installing the Cisco ONS 15454 Four-Shelf and Zero-Shelf Bay Assembly
document that ships with the bay assembly.
1.3 ONS 15454 ETSI Rack Installation
The ONS 15454 ETSI shelf assembly (15454-SA-ETSI) is mounted in a 600 x 600-mm (23-inch) or 600
x 300-mm (11.8-inch) equipment cabinet/rack. The shelf assembly projects 240 mm (9.45 inches) from
the front of the rack. It mounts in ETSI-standard racks. The shelf assembly is a total of 435 mm (17.35
inches) 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 ETSI shelf assembly measures 616.5 mm (24.27 inches) high, 535 mm (21.06 inches)
wide, and 280 mm (11.02 inches) deep. You can install up to three ONS 15454 ETSI shelves in a
seven-foot (2133.6 mm) equipment rack. The ONS 15454 ETSI 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 ETSI is installed below the first shelf assembly, an ETSI air ramp unit must be assembled
between the two shelves to ensure adequate air flow.
Figure 1-3 provides the dimensions of the ONS 15454 ETSI shelf assembly.
Caution The standard ETSI racks can hold three ONS 15454 ETSI shelf assemblies and two air ramps. When
mounting a shelf assembly in a partially filled rack, load the rack from the bottom to the top with the
heaviest component at the bottom of the rack. If the rack is provided with stabilizing devices, install the
stabilizers before mounting or servicing the unit in the rack.
Caution The ONS 15454 ETSI must have 1 inch (25.4 mm) of airspace below the installed shelf assembly to
allow air flow to the fan intake. The air ramp (the angled piece of sheet metal on top of the shelf
assembly) provides this spacing and should not be modified in any way.
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