Chassis Air Flow Guidelines - Cisco ASR 9000 Series Manual

Preparing for Installation
To predict and remedy strong EMI, you may need to consult with experts in radio frequency interference
Note
(RFI).
Site wiring is unlikely to emit radio interference if you use twisted-pair cable with a good distribution of
grounding conductors. Use a high-quality twisted-pair cable with one ground conductor for each data signal,
when applicable.
Give special consideration to the effect of a lightning strike in your vicinity, especially if the wiring exceeds
the recommended distances, or if it passes between buildings. The electromagnetic pulse (EMP) caused by
lightning or other high-energy phenomena can easily induce enough energy into unshielded conductors to
destroy electronic devices. If you have experienced EMP problems in the past, you may want to consult experts
in electrical surge suppression and shielding.
Most data centers cannot resolve infrequent but potentially catastrophic problems without pulse meters and
other special equipment. In addition, these problems can take a great deal of time to identify and resolve. We
recommend that you take the necessary precautions to avoid these problems by providing a properly grounded
and shielded environment, with special attention to issues of electrical surge suppression.

Chassis Air Flow Guidelines

This table describes how cool air is circulated through the Cisco ASR 9000 Series Routers.
Table 1: Chassis Air Flow Guidelines
Router Type
Cisco ASR 9010
Cisco ASR 9006
Cisco ASR 9904
Cisco ASR 9910
Chassis Air Flow
Air is circulated by two fan trays located underneath the Route Switch Processor
(RSP) and line cards as shown
9010 Router—Side View, on page
Air is circulated from side to rear by two fan trays located along upper top left
side of chassis as shown in Figure 9: Air Flow Path through the Cisco ASR 9006
Router—Front View, on page 15
Air is circulated side-to-side by a single fan tray located along the left rear side
of the chassis as shown in Figure 10: Air Flow Path through the Cisco ASR 9904
Router—Front View, on page
If the router is installed in a 2-post 23-inch rack, air flow is circulated
front-to-back. Optionally, you can install air baffles on the chassis to help isolate
the exhaust air from the intake air. For more information, see
Air Baffles on the Cisco ASR 9904
Air is circulated by two fan trays located on upper rear side of chassis as shown
in Figure 11: Air Flow Path through the Cisco ASR 9910 Router—Side View,
on page 16.
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
Site Requirement Guidelines
inFigure 8: Air Flow Path through the Cisco ASR
15.
16.
Router.
Installing Optional
13