Cisco AS5800 Product Overview 1-35
Cisco7206 Router Shelf
Figure1-21 Cisco 7206 Router—Rear View
Three internal fans draw cooling air into chassis and across internal components to maintain an
acceptable operating temperature. The three fans are enclosed in a tray that is located in the
subchassis.
Caution To ensure the proper flow of cooling air across the internal components, make sure blank
port adapters are installed in all unoccupied port adapter slots and power supply filler plates are
installed in unoccupied power supply bays.
Network Processing Engine
The network processing engine has no external connectors or LEDs. Th ere is a h andle fo r remo ving
and installing the network processing engine and two captive screws for securing it to the chassis.
Note The network processing engine does not support OIR. You must power down the Cisco7206
before removing the network processing engine from the router.
The Midplane
The I/O controller, port adapters, power supplies, and network processing engine slide into their
respective chassis slots and connect di rectly to the router’s midplane; there are no inter nal cables to
connect. The midplane distributes DC power from the power supplies to the I/O controller, port
adapters, fan tray, and network processing engine.
The midplane also identifies OIR of the port adapters, bridges the PCI buses from the port adapters
to packet static random-access memory (SRAM) on the network processing engi ne, arbit rates traf fic
across the PCI buses, and generates the clock signals for the port adapters on each PCI bus.
H6423
NETWORK PROCESSING ENGINE-150
Internal fans
Network processing engine
or network services engine
AC-input
power supply
AC-input
receptacle
Power supply
filler plate
Chassis
grounding
receptacles
Power switch