Cisco 7200 VXR router User Manual page 21

Do not mix power supplies in the Cisco 7206VXR. In dual power supply router
Caution
configurations, both power supplies must be of the same type (two AC-input power supplies
or two DC-input power supplies).
Adjacent to the power supply bays are two chassis ground receptacles that provide a chassis
ground connection for ESD equipment or a two-hole grounding lug. (See Figure 1-4.)
Three internal fans draw cooling air into the chassis and across the internal components to
maintain an acceptable operating temperature (see Figure 1-4). The three fans are enclosed
in a tray that is located inside the chassis.
To ensure the proper flow of cooling air across the internal components, make
Caution
sure blank port adapters are installed in unoccupied port adapter slots, and power supply
filler plates are installed in unoccupied power supply bays.
The I/O controller, port adapters, power supplies, and network processing engine slide into
their respective chassis slots and connect directly to the router's midplane; there are no
internal cables to connect. The midplane distributes power from the power supplies to the
I/O controller, port adapters, fan tray, and network processing engine.
The midplane also senses OIR of the port adapters, bridges the PCI buses from the
port adapters to packet memory on the network processing engine, arbitrates traffic across
the PCI buses, and generates the clock signals for the port adapters on each PCI bus.
The Cisco 7206VXR operates as either a tabletop or a rack-mounted unit. A rack-mount kit
is standard equipment included with all Cisco 7200 VXR routers when they are shipped
from the factory. The kit provides the hardware needed to mount the router in a standard
19-inch equipment rack or a telco rack. Steps for installing the Cisco 7206VXR router in
an equipment rack are the same for all Cisco 7200 VXR routers and are explained in the
chapter "Installing a Cisco 7200 VXR Router." If you are not rack-mounting your
Cisco 7206VXR, place it on a sturdy tabletop or platform.
A fully configured Cisco 7206VXR, with two installed power supplies and all chassis slots
filled, weighs approximately 50 pounds (22.7 kilograms [kg]). For clearance requirements
and rack-mount installation considerations, see the section "Site Environment" in the
chapter "Preparing for Installation."
Cisco 7206VXR Overview
Cisco 7200 VXR Product Overview 1-11