Air Plenum - Cisco ASR 903 Hardware Installation Manual

RSP Modules

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. For installing the
plenum, see
When the air plenum and the fan filter are installed in the chassis, the system operating temperature is
Note
limited to 55 degrees Celsius.
The air plenum is available from GAW (www.GawTechnology.net). To order an air plenum, contact the Sales
and Marketing support staff at GAW (see Manufactures).
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
• 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
• Storage of software images, system configuration, OBFL, SysLog
• PTP packet processing including IEEE 1588-2008 for recovering network timing (frequency, phase,
• External management interfaces (RS232 console, management ENET, USB console, USB storage) and
Supported RSPs
The Cisco ASR 903 Router supports the following RSPs:
• A900-RSP1A-55—Provides 2 GB of SDRAM, 5 Mb of TCAM memory, 36Mb buffer table, 576-Mb
• A900-RSP1B-55—Provides 4 GB of SDRAM, 20 Mb of TCAM memory, 144-Mb buffer table, 1152-Mb
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
12
Installing the Chassis in the Air
information, role negotiation, function for detection, health and status exchange, role negotiation
clock references.
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
system status LED indicators
forwarding memory, and 1,536-Mb packet buffer memory.
forwarding memory, and 1,536-Mb packet buffer memory.
Plenum.
Cisco ASR 903 Router Overview