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1-5
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 1 Hardware Installation
Rack Installation
1.3 Rack Installation
Caution The chassis must be mounted on a rack that is permanently affixed to the building to maintain
stability.
The ONS 15454 SDH is mounted in an ETSI equipment rack. The shelf assembly projects 40 mm from
the front of the rack. The shelf assembly is 431.8 mm wide with no mounting brackets (ears) attached,
and 535 mm wide with brackets attached. The shelf assembly measures 616.5 mm high and 280 mm
deep. Ring runs are not provided by Cisco and can hinder side-by-side shelf installation where space is
limited.
You can install up to three ONS 15454 SDHs in an ETSI rack. The ONS 15454 SDH must have 40 mm
of airspace below an installed shelf assembly to allow air flow to the fan intake. If an ONS 15454
SDH is installed below a previously installed shelf assembly, the air ramp between the two
provides sufficient air flow and should not be modified in any way. Figure 1-1 shows the dimensions
of the ONS 15454 SDH.
A node should be mounted at the bottom of the rack if it is the only unit in the rack. When mounting a
node 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.
Warning
To prevent the system from overheating, do not operate it in an area that exceeds the maximum
recommended ambient temperature of 45°C (113°F).
Warning
To prevent bodily injury when mounting or servicing this unit in a rack, you must take special
precautions to ensure that the system remains stable. The following guidelines are provided to
ensure your safety
Warning
Care must be given when connecting nodes to the supply circuit so that wiring is not overloaded.
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