• A907-FAN-E
The fan tray has:
• Four dual rotor fans—for the PSU area cooling
• 12 fans (three columns for four fans)—60x60x38mm fans for the RSP and IM area
The fan tray has the following hardware features:
• It provides side-to-side forced air cooling
• It provides redundant fans
• It is field replaceable
• It contains status LEDs
For more information about air flow guidelines, see
. For instructions on how to install
the fan tray, see
. For a summary of the LEDs on the fan tray, see
.
Dust Filter (A907-FAN-F)
The dust filter on the fan tray is a quadrafoam 45PPI filter which is 85 percent dust resistant. For installing
the fan filter, see
Removing and Replacing the Dust Filter
section.
Air Plenum (A907-F2B-AIR-U)
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 air flow front-back pattern
provides a rack installation bay with a cool front zone and hot rear zone. For installing the plenum, see
Installing the Chassis in the Air Plenum
section.
When the air plenum and the fan filter are installed in the chassis, the system operating temperature is 55º C.
Note
RSP Modules
The Cisco ASR 907 Router is designed to use up to two RSP modules 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, redundancy, external management, and system status indications on the router.
RSP features include:
• Loading software onto processor-based interface modules
• Redundant RSP management—The RSP manages detection of RSPs, exchange of health and status
information, role negotiation, function for detection, health and status exchange, role negotiation
• Packet processing
• Traffic management, including buffering, queuing, and scheduling, Ethernet MAC functions
• Network clocking functions including phase and time-of-day for BITS, 1 PPS, 10 MHz, and 1588 PTP
clock references.
• Storage of software images, system configuration, SysLog
• PTP packet processing including IEEE 1588-2008 for recovering network timing (frequency, phase, and
time) from upstream PTP clocks, for generating PTP frequency and phase references as inputs to the
SETS, and for distributing them to downstream PTP clocks
Cisco ASR 907 Router Hardware Installation Guide
7
Cisco ASR 907 Router Overview
Dust Filter (A907-FAN-F)