System Components
1-6
SmartEdge 1200 Router Hardware Guide
Figure 1-2
NEBS-Compliant SmartEdge 1200n Chassis
Chassis Cooling
Cooling for the chassis is provided by the fan tray, which is installed directly above the card slots. Six fans
provide the needed airflow from the bottom of the chassis to the top with exhaust at the rear of the chassis.
An air filter is installed below the card cage and filters incoming air before it reaches the cards.
A single fan failure does not impact the operation of the system; however, to prevent overheating, the unit
must be replaced as soon as possible. To maintain the airflow through the chassis, empty slots must have
blank cards installed.
Chassis Power
The SmartEdge 1200 router power architecture has two power zones, each with primary and backup
sources. Primary sources are referred to as A sources; backup sources are B sources. A1 refers to the
primary power source for zone 1; B1 refers to the backup power source for zone 1. Both zones 1 and 2 must
be connected for the chassis to be operational; the connections can be any combination of A and B sources.
For a fully redundant power configuration, all four sources must be connected.
Zone 1 sources provide power to slots 1 to 7 in the chassis; zone 2 sources provide power to slots 8 to 14.
The chassis fan tray is powered from either zone.
Caution
Risk of equipment damage. SmartEdge router cards can be damaged by lack of cooling when
the chassis has empty slots. To reduce the risk, every slot must have a controller, traffic, or
blank card installed in it to ensure proper airflow through the chassis.
