Chapter iv Cisco ASR 903 Router Overview

Cisco ASR 903 Router Features

Fan Tray (A903-FAN)

The Cisco ASR 903 Router uses a modular fan tray that is separate from the power supply. The fan tray
contains twelve fans and provides sufficient capacity to maintain operation indefinitely in the event of
an individual fan failure.

Figure iv-4 Cisco ASR 903 Router Fan Tray (A903-FAN)

FAN TEMP

CRIT MAJ MIN

ALARM
281933

Fan Tray (A903-FAN-E)

The A903-FAN-E is a fan tray containing twelve (40 x 40 x 20 mm) fans and provides sufficient capacity
to maintain operation indefinitely in the event of an individual fan failure. It has a 8 mm fan dust filter
that prevents dust from entering the unit and avoids possible damage to the components. The fan tray is
IEC60950-1 compliant.

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Figure iv-5 Cisco ASR 903 Fan Tray with Dust Filter and Dummy Cover (A903-FAN-E)

360555
4

1 LEDs 4 Dummy cover

2 Alarm 5 Pull tab
3 Dust filter —

Dust Filter (A903-FAN-F)

The dust filter (see Figure iv-5) 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” section on page 2-11.

Note Use the pull tab provided to easily access the filter.

Air Plenum
Air Plenum or air baffle assembly (see Figure 2-7) 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 “Installing the Chassis in the Air Plenum” section on page 2-6.

Note When the air plenum and the fan filter are installed in the chassis, the system operating
temperature is 55 degrees Celsius.

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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 Table 5-2).

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.
The following sections describe the Cisco ASR 903 Router RSP:
• Supported RSP Features, page iv-11
• RSP Redundancy, page iv-12
• Network Timing Interfaces, page iv-12
• RSP Interfaces, page iv-13
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, OBFL, 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
• External management interfaces (RS232 console, management ENET, USB console, USB storage)
and system status LED indicators

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 forwarding memory, and 1,536-Mb packet buffer memory.
• A900-RSP1B-55—Provides 4 GB of SDRAM, 20 Mb of TCAM memory, 144-Mb buffer table,
1152-Mb forwarding memory, and 1,536-Mb packet buffer memory.
• A900-RSP2A-128—Provides 4 GB double data rate type three (DDR3) memory, 128 Gbps
aggregate throughput.
• A900-RSP2A-64—Provides 4 GB double data rate type three (DDR3) memory, 64 Gbps aggregate
throughput.

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Note The supported RSPs have different memory capacities, but they have the same interfaces and
functionality.

Figure iv-6 A900-RSP2A-128 Module

391547
Note Installing a mix of RSP modules in the chassis is not supported.

The RSPs do not provide external network interfaces for user traffic. All network interfaces are provided
via separate IMs.

A900-RSP1 Supported Interface Modules

Table iv-4 A900-RSP1 Supported Interface Modules and Part Numbers

RSP Module Interface Modules Part Number Slot

A900-RSP1A-55 8-port Gigabit Ethernet SFP Interface Module A900-IMA8S All
A900-RSP1B-55 (8X1GE)
8-port Gigabit Ethernet RJ45 (Copper) Interface A900-IMA8T
Module (8X1GE)
1-port 10 Gigabit Ethernet XFP Interface Module A900-IMA1X 0-3
(1X10GE)
16 x T1/E1 Interface Module A900-IMA16D All
4-Port OC3/STM-1 (OC-3) or 1-Port OC12/STM-4 A900-IMA4OS
(OC-12) Interface Module
14-port Serial Interface Module A900-IMASER14A/S

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A900-RSP2 Supported Interface Modules

Note • The combination IMs (A900-IMA8S1Z, A900-IMA8T1Z), and the A900-IMA2Z are not supported
on the A900-RSP1A-55 and A900-RSP1B-55 modules on the Cisco ASR 903 Router.
• The combination IMs (A900-IMA8S1Z, A900-IMA8T1Z) are not supported on the A900-RSP2-64
RSP module on the Cisco ASR 903 Router.

Table iv-5 A900-RSP2 Supported Interface Modules and Part Numbers

RSP Module Supported Interface Modules Part Numbers Slot

A900-RSP2A-128 8-port Gigabit Ethernet SFP Interface Module (8X1GE) A900-IMA8S All
8-port Gigabit Ethernet RJ45 (Copper) Interface Module A900-IMA8T
(8X1GE)
1-port 10 Gigabit Ethernet XFP Interface Module A900-IMA1X
(1X10GE)
16 x T1/E1 Interface Module A900-IMA16D
4-Port OC3/STM-1 (OC-3) or 1-Port OC12/STM-4 A900-IMA4OS
(OC-12) Interface Module
SFP Combo IM—8-port Gigabit Ethernet (8X1GE) + A900-IMA8S1Z
1-port 10 Gigabit Ethernet (1X10GE)
Copper Combo IM—8-port Gigabit Ethernet (8X1GE) A900-IMA8T1Z
+ 1-port 10 Gigabit Ethernet Interface Module(1X10GE)
2-port 10 Gigabit Ethernet Interface Module(2X10GE) A900-IMA2Z
A900-RSP2A-64 1-port 10 Gigabit Ethernet XFP Interface Module A900-IMA1X 0-2
(1X10GE)
2-port 10 Gigabit Ethernet Interface Module (2X10GE) A900-IMA2Z
4-Port OC3/STM-1 (OC-3) or 1-Port OC12/STM-4 A900-IMA4OS
(OC-12) Interface Module
8-port Gigabit Ethernet SFP Interface Module (8X1GE) A900-IMA8S 3-5
8-port Gigabit Ethernet RJ45 (Copper) Interface Module A900-IMA8T
(8X1GE)
16 x T1/E1 Interface Module A900-IMA16D

Supported RSP Features

The RSP provides the following features on the Cisco router:
• Centralized data plane, timing, and control plane functions for the system
• High-level control of interface modules
• Management functionalities for the router

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• Control plane (host) CPU and associated memory in which IOS-XE and platform control software
runs
• Nonvolatile memory for storage of software images, configurations, and system files
• Enabling and monitoring the health and presence of fan trays, interface modules, and power supplies
• Field replacement and hot-swap capabilities

Swapping of Interface Modules

The Ethernet interface modules support swapping on the Cisco A900-RSP2A module.
• 8-port Gigabit Ethernet SFP Interface Module (8X1GE)
• 8-port Gigabit Ethernet RJ45 (Copper) Interface Module (8X1GE)
• 1-port 10 Gigabit Ethernet XFP Interface Module (1X10GE)
• SFP Combo IM—8-port Gigabit Ethernet (8X1GE) + 1-port 10 Gigabit Ethernet (1X10GE)
• Copper Combo IM—8-port Gigabit Ethernet (8X1GE) + 1-port 10 Gigabit Ethernet Interface
Module(1X10GE)
• 2-port 10 Gigabit Ethernet Interface Module(2X10GE)
Use the hw-module subslot default command before performing a swap of the modules. to default the
interfaces on the interface module.

Note Failure in executing the command may cause the interface to enter the Out of Service state. To recover
from out of service state, perform the following:
• Insert the original IM and execute the hw-module subslot 0/bay default command. Swap the
module. For more information, see Cisco IOS Interface and Hardware Component Command
Reference.
• If the module does not come up, perform a reload of the router.

RSP Redundancy
The Cisco ASR 903 Router chassis includes two RSP slots to allow for redundant RSPs. When the router
uses redundant RSPs, one RSP operates in the active mode and the other operates in the hot standby
mode. Removal or failure of the active RSP results in an automatic switchover to the standby RSP.

Note If you are using redundant RSPs, both the RSPs must be of the same type because a mixed configuration
of two different RSP types is not supported.

Network Timing Interfaces

The RSP supports the following network timing interfaces:
• BITS input/output port—RJ48 jack
• 1 PPS input and output—Mini coax connectors
• 2.048 or 10 MHz input and output—Mini coax connectors
• Time of Day (ToD) or 1 PPS input or output port—Shielded RJ45 jack

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Network timing interfaces support redundancy in a redundant RSP configuration. Network timing
interfaces on a redundant RSP remain in operation while the RSP is in hot standby mode.

RSP Interfaces
Figure iv-7 summarizes the interfaces on the RSP module.

Figure iv-7 RSP Interfaces Summary

1 2 3 4 5 6 7 8 9 10

SYNC
ACT
PWR
1PPS 1PPS 1OMHZ 1OMHZ
MEM CONSOLE IN OUT IN OUT TOD BITS MGMT STAT
ENET

281931
Label Interface
1 USB memory port
2 USB console port
3 Console port
4 1 PPS input timing port
5 1 PPS output timing port
6 10 MHz input timing port
7 10 MHz output timing port
8 Time of Day (ToD) timing port
9 BITS timing port
10 Ethernet management port

The Cisco A900-RSP2A module has the following front panel interfaces. For information on cable
pinout, see Pinouts, page 4-1.
• 1 USB Type-A Connector for USB-flash (Label = “MEM”)
• 1 USB Type-A Connector for alternate console port (Label = “CONSOLE”)
• RJ45 Connecter for Con/Aux (Label = “CONSOLE”)
• RJ48 Jack for BITS interface. (Label = “BITS”)
• RJ48 Jack for Time-of-Day interface. (Label= “TOD”)
• RJ45 Connecter for Con/Aux (Label = “MGMT ENET”)
• 4 Mini-Coax connectors (Label = “1PPS IN”, “1PPS OUT”, “10MHZ IN”, “10MHZ OUT”)
For more information about installing the RSP, see “RSP Installation” section on page 2-14. For more
information about the RSP LEDs, see “RSP LEDs” section on page 4-10.

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Interface Modules
The Cisco ASR 903 Router interface modules are a field-replaceable units. In addition to the ports
provided on an RSP, the Cisco ASR 903 Router supports the following interface modules:
• Gigabit Ethernet SFP Interface Module, page iv-14
• Gigabit Ethernet RJ45 Interface Module, page iv-15
• 10 Gigabit Ethernet XFP Interface Module, page iv-16
• T1/E1 Interface Module, page iv-18
• OC-3 Interface Module, page iv-18
• Serial Interface Module, page iv-19
• 8x1 Gigabit Ethernet SFP+ 1x10 Gigabit Ethernet SFP+ Combination Interface Module, page iv-21
• 8x1 Gigabit Ethernet RJ45 + 1x10 Gigabit Ethernet SFP+ Combination Interface Module,
page iv-23
• 2x1 10 Gigabit Ethernet SFP+ Interface Module, page iv-24

Note For information about supported interface modules, see the Release Notes for the Cisco ASR 903 Series
Aggregation Services Router.

Gigabit Ethernet SFP Interface Module

The Gigabit Ethernet Small Form-Factor Pluggable (SFP) interface module provides eight Gigabit
Ethernet SFP modules. Figure iv-8 shows the 8 x 1 GE Gigabit Ethernet SFP interface module.

Figure iv-8 8 x 1 GE Gigabit Ethernet SFP Interface Module

282440

Supported SFP Modules

The Gigabit Ethernet SFP interface module supports the following SFP modules:
• GLC-BX-D
• GLC-BX-U
• GLC-EX-SMD
• GLC-FE-100BX-D

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