Note the following points:
•
When installing Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router in a
back-to-back position with another device, ensure that there is a minimum of 10 cm air flow clearance
between the two devices.
Also ensure that the device behind the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M
Routeris not installed in a way that t it blows air into the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M,
ASR-920-24TZ-M Router.
•
If airflow through the equipment rack and the routers that occupy it is blocked or restricted, or if the
ambient air being drawn into the rack is too warm, an overtemperature condition may occur within the
rack and the routers that occupy it.
•
The site should also be as dust-free as possible. Dust tends to clog the router fans, reducing the flow of
cooling air through the equipment rack and the routers that occupy it, thus increasing the risk of an
overtemperature condition.
•
Enclosed racks must have adequate ventilation. Ensure that the rack is not congested because each router
generates heat. An enclosed rack should have louvered sides and a fan to provide cooling air. Heat that
is generated by the equipment near the bottom of the rack can be drawn upward into the intake ports of
the equipment above.
•
When mounting a chassis in an open rack, ensure that the rack frame does not block the exhaust fans.
•
When rack-installed equipment fails, especially equipment in an enclosed rack, try operating the equipment
by itself, if possible. Power off all the other equipment in the rack (and in adjacent racks) to give the
router maximum cooling air and clean power.
•
Avoid installing the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router in a
location in which the chassis air intake vents may draw in the exhaust air from adjacent equipment.
Consider how the air flows through the router; the airflow direction is front to back, with ambient air
drawn in from the vents located on the sides of the chassis.
When mounting the router in any type of rack equipment, ensure that the inlet air to the router does not
exceed 70° C.
Caution
Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation
Guide
35
Preparing for Installation
Site Selection Guidelines
