Dust Filter (A902-Fan-F) - Cisco ASR 902U Hardware Installation Manual

Overview
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Dust Filter (A902-FAN-F)

The dust filter (as shown in the figure in Fan Tray (A902-FAN-E section) on the fan tray is a quadrafoam
45PPI filter that is 85 percent dust resistant. A dummy cover (A902-FAN-F-B) secures the dust filter in the
chassis. For installing the fan filter, see
Use the pull tab to easily access the filter.
Note
Air Plenum
Air plenum or air baffle assembly is used to change the air flow pattern of the unit. When the router is installed
with the plenum, the air flow pattern is changed from side-side to front-back. The front-back air flow pattern
provides a rack installation bay with a cool front zone and a hot rear zone. For information about installing
the plenum, see
Note When the air plenum and the fan filter are installed in the chassis, the system's maximum operating
temperature should be 55 degrees Celsius.
To order an air plenum, contact the Sales and Marketing staff at GAW (www.GawTechnology.net) (see
Manufacturers of Equipment Used in Cisco ASR 902
RSP Modules
The Cisco ASR 902 Router is designed to use a single RSP module to handle the data plane, network timing,
and control plane functionalities for the router. The RSP configuration allows you to use Cisco IOS software
to control chassis management, external management, and system status indications on the router.
RSP features include:
• Loading software onto processor-based interface modules
• Packet processing
• Traffic management, including buffering, queuing, and scheduling, Ethernet MAC functions.
• Network clocking functions, including phase and time-of-day for Building Integrated Timing Source
• Storage of software images, system configuration, Onboard Failure Logging (OBFL), syslog.
• PTP packet processing, including IEEE 1588-2008 for recovering network timing (frequency, phase,
Component
Dust filter
Installing the Router Chassis in the Air
(BITS), 1 PPS, 10 MHz, and 1588 Precision Time Protocol (PTP) clock references.
and time) from upstream PTP clocks for generating PTP frequency and phase references as inputs to
Cisco ASR 902 and ASR 902U Aggregation Services Router Hardware Installation Guide
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theInstalling the Dust Filter
Plenum.
Router).
Air Plenum
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