Cisco ASR 903 User Manual

Fan Tray
The fan tray has the following hardware features:
•
It provides side-to-side forced air cooling
•
It provides redundant fans
•
It is field replaceable
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It contains status LEDs
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It contains an alarm port with four external alarm inputs
Dust Filter (A903-FAN-F)
The dust filter (see Figure 1-7 ) on the fan tray is a quadrafoam 45PPI filter which is 85 percent dust resistant. A dummy cover
(A903-FAN-F-B) secures the dust filter in the chassis. For installing the fan filter, see Installing the Dust Filter .
Use the pull tab provided to easily access the filter.Note
Air Plenum
Air Plenum or air baffle assembly (see Figure 3-7 ) is used 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.
When the air plenum and the fan filter are installed in the chassis, the system operating temperature is
limited to 55 degrees Celsius.
Note
The air plenum is available from GAW (www.GawTechnology.net). To order an air plenum, contact the Sales and Marketing support
staff at GAW.
RSP Modules
The Cisco ASR 903 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
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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.
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Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English