Equipment Rack Guidelines; Locating For Safety; Locating For Easy Maintenance - Cisco ASR-920-24SZ-IM Hardware Installation Manual

Rack-Mounting Guidelines
The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router is not recommended to be
Caution
installed in an enclosed rack because the chassis requires an unobstructed flow of cooling air to maintain
acceptable operating temperatures for its internal components. If you use an enclosed rack, ensure that
the air flow requirements are maintained as discussed in Air Flow Guidelines.

Equipment Rack Guidelines

The placement of a rack can affect personnel safety, system maintenance, and the system's ability to operate
within the environmental characteristics. Choose a proper location for the Cisco ASR 920-24SZ-IM,
ASR-920-24SZ-M, ASR-920-24TZ-M Router by following the guidelines described here.

Locating for Safety

If the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router is the heaviest or the only
piece of equipment in the rack, consider installing it at or near the bottom to ensure that the rack's center of
gravity is as low as possible.
For additional information about the proper placement of electronic equipment, consult the
Network Equipment Building System (NEBS) Requirements: Physical Protection

Locating for Easy Maintenance

It is recommended that you maintain a minimum clearance distance as mentioned below, at all times.
• front clearance—12.7 cm
• rear clearance—10 cm
This space ensures that you can remove the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M
Router components and perform routine maintenance and upgrades easily.
Avoid installing the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router in a congested
rack and consider how routing of cables from other pieces of equipment in the same rack could affect access
to the router cards.
The front and rear of the chassis must remain unobstructed to ensure adequate airflow and prevent overheating
inside the chassis.
To avoid problems during installation and ongoing operations, follow these general precautions when you
plan equipment locations and connections:
• Use the show environment all command regularly to check the internal system status. The environmental
monitor continually checks the interior chassis environment; it provides warnings about high temperature
and creates reports on other potentially dangerous occurrences. If warning messages are displayed, take
immediate action to identify the cause, and correct the problem.
• Keep the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router off the floor and out
of areas that collect dust.
• Follow ESD-prevention procedures to avoid damage to equipment. Damage from static discharge can
cause immediate or intermittent equipment failure.
Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation
Guide
40
Preparing for Installation
GR-63-CORE,
document.