Cisco ASR 900 Series Aggregation Services Routers

Cisco ASR 903 Series Router Data Sheet

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The Cisco® ASR 903 Router is a full-featured aggregation platform designed for the cost-effective delivery of converged mobile and business services. With redundancy, shallow depth, low power consumption and high service scale, this 3-rack-unit (3RU) router is optimized for small aggregation and remote point-of-presence (POP) applications. The Cisco ASR 903 Router (Figure 1) provides a comprehensive and scalable feature set of Layer 2 VPN (L2VPN) and Layer 3 VPN (L3VPN) services in a compact package.

Figure 1. Cisco ASR 903 Router

Major Applications

Broadband Aggregation

The Cisco ASR 903 Router supports broadband aggregation for delivering “any-play” services (voice, video, data, and mobility). Designed to support thousands of subscribers, quality of service (QoS) on the Cisco ASR 903 Router is capable of scaling up to a large number of queues per device. This large number of queues, combined with a highly granular QoS algorithm (three-level hierarchical QoS), results in a greatly enhanced broadband user experience. This full-featured Layer 2 and Layer 3 switch router supports a variety of broadband applications including IPTV and video on demand (VoD), enhancing and extending the Cisco IP Next-Generation Network (IP NGN) architecture.

Pre-Aggregation for Mobile Applications

Deployed as a pre-aggregation platform for mobile backhaul, the Cisco ASR 903 Router can aggregate cell sites and use Multiprotocol Label Switching (MPLS) as a transport for Radio Access Network (RAN) backhaul traffic. The Cisco ASR 903 Router provides the timing services required in today’s converged access networks, by offering integrated support for the Building Integrated Timing Supply (BITS), 10 MHz, 1 Pulse Per Second (1PPS) and Time Of Day (TOD) interfaces. The Cisco ASR 903 Router also supports synchronous Ethernet (SyncE) and IEEE-1588, and can act as the source for network clocking for time-division multiplexing (TDM), SDH and SONET, SyncE, and GPS interfaces. In addition to the timing services, the Cisco ASR 903 Router can be deployed in small and harsh environments, due to its shallow depth and qualification for extended temperature ranges.

Metro Ethernet Aggregation

The Cisco ASR 903 Router is built to meet service provider requirements for Carrier Ethernet aggregation. It is optimized for remote central office and smaller aggregation sites where a full-featured, small-footprint, fully redundant aggregation platform is needed. The Cisco ASR 903 Router offers service flexibility and delivers Layer2, IP, and MPLS transport for advanced L2VPN, L3VPN, and multicast services.

Major Differentiators

The Cisco ASR 903 Router helps service providers deliver advanced services for residential broadband, mobile, and Metro Ethernet applications. This allows an operator to provide differentiated and cost-effective services to end users.

Flexible Deployment Options

The Cisco ASR 903 Router is designed with a 3RU compact form factor to accommodate deployment in small spaces. Available with a range of mounting options, the router can be deployed in space-constrained locations such as ETSI 300-mm deep cabinets. The side-to-side airflow design allows two Cisco ASR 903 Routers to be mounted back-to-back in a 600-mm cabinet, while the extended temperature range supported by the ASR 903 Router allows the router to be deployed in locations with minimum environmental control. Small footprint and extended temperature range support allows service providers to extend the reach of their Carrier Ethernet networks to more challenging and remote locations and yet save money on air conditioning.

High Availability and Modularity

The Cisco ASR 903 Router is a fully modular platform. Cisco offers a choice of two distinct route switch processors (RSPs), AC and DC power supplies, a fan tray and a wide range of interface modules. The Ethernet interfaces are available in copper and fiber, with speed ranging from 10 Mbps to 10 Gbps. The legacy interfaces are available in speeds ranging from nxDS0 to OC-3/STM-1 for PDH, SDH, and SONET. The interface modules, power supplies, and fan tray are all field replaceable. The design of the Cisco ASR 903 Router delivers in-box hardware redundancy and supports software redundancy with In Service Software Upgrade (ISSU) support when a pair of route switch processors are inserted in the chassis.

Operational Efficiency

The Cisco ASR 903 Router features essential capabilities that help service providers simplify and automate the management of their networks, resulting in efficiency gains in the deployment and operation of the networks. The Cisco ASR 903 Router provides proactive diagnostic tools including Generic On-Line Diagnostics (GOLD) and Onboard Failure Logging (OBFL). These tools help service providers avoid potential problems before they occur, troubleshoot any problems, and when these are diagnosed, implement solutions.

System Design

The Cisco ASR 903 Router is a fully modular system, with a future-ready design. The chassis supports online field replacement and upgrades of all components. The chassis is designed to contain one fan tray, two power supplies, two RSP cards, and up to six interface module cards.

Fan Tray

The Cisco ASR 903 Router has a single fan tray slot, which must be populated for the system to operate. The fan tray contains redundant fans and the system will continue to operate on a single fan failure. The system has been designed to remain operational during the replacement of the fan tray. In addition to cooling the chassis, the fan tray also contains a connector for four dry-contact inputs and several system-level alarm LEDs.

Power Supply

Both an AC and a DC power supply are available for the Cisco ASR 903 Router. The system supports operation on a single power supply, while with two power supplies, both will function in a load-share configuration. Mixing of AC and DC power supplies in a single operational chassis is not supported.

Route Switch Processor

The Cisco ASR 903 Route Switch Processor (RSP) is the centralized card in the system performing the data plane, network timing, and control plane functions for the system.

Two RSP slots are provided in the Cisco ASR 903 Router for optional redundancy. With two RSPs inserted in the Cisco ASR 903 Router, one RSP operates in active mode and the other RSP operates in hot standby mode. The RSP is a field replaceable unit (FRU) and can be online inserted and removed (OIR) while the system is operational. The removal or failure of the active RSP results in the automatic switchover to the standby RSP.

Interface Modules

The Cisco ASR 903 Router has six interface module slots. There are two types of interface module slots. Four slots (slots 0 to 3) support all of the available interface modules. The remaining two slots (slots 4 and 5) support only the Gigabit Ethernet and TDM Interface modules; the 10-Gigabit Ethernet modules are not supported in these slots. Interface Module Slot 5 is limited to a maximum of seven Gigabit Ethernet ports with the Cisco ASR 903 Route Switch Processor 1 (RSP1).


The Cisco ASR 903 Router is supported in Cisco IOS® XE S Software, which is a modular operating system. Cisco IOS XE Software is designed to provide modular packaging, feature velocity, and powerful resiliency. For more information on the supported features and software capabilities, see the Cisco IOS XE Software for Cisco ASR 903 Router data sheet.

Network Management

The Cisco ASR 903 Router is supported in Cisco Prime™ for IP Next Generation Networks (IP NGN). Cisco Prime for IP NGN is an end-to-end network management solution that drastically simplifies the design, provisioning, and management of carrier-grade networks. It is a comprehensive solution that centralizes and automates service design, fulfillment, assurance, and performance analysis to help service providers and enterprises lower their costs while meeting high customer expectations.

In addition to the Cisco Prime for IP NGN support, the Cisco ASR 903 Router is also supported in the Cisco Configuration Engine. The Cisco Configuration Engine delivers Zero Touch Deployment (ZTD) capability for the Cisco ASR 903 Router, which drastically reduces the time required to deploy a network.

Table 1 lists the hardware parts available for Cisco ASR 903 Router.

Table 1. Hardware Components for Cisco ASR 903 Router

Part Number



ASR 903 Router Chassis


ASR 903 Router Chassis, Spare


ASR 903 FAN Tray


ASR 903 FAN Tray, Spare

ASR 903 Common Equipment


ASR 900 550W AC Power Supply


ASR 900 550W AC Power Supply, Spare


ASR 900 550W DC Power Supply


ASR 900 550W DC Power Supply, Spare

Cisco ASR 903 Accessories


ETSI Rack Mount Option for the Cisco ASR 903


ETSI Rack Mount Option for the Cisco ASR 903, Spare


EIA 19in Rack Mount Option for the Cisco ASR 903


EIA 19in Rack Mount Option for the Cisco ASR 903, Spare


ASR 900 Power Supply Blank Cover


ASR 900 Power Supply Blank Cover, Spare


ASR 903 Route Switch Processor Type-A Blank Cover


ASR 903 Route Switch Processor Type-A Blank Cover, Spare


ASR 900 Interface Module Type-A Blank Cover


ASR 900 Interface Module Type-A Blank Cover, Spare

Product Specifications

Tables 2 through 4 list the product, power, and environmental specifications for the Cisco ASR 903 Router. Table 5 provides safety and compliance information.

Table 2. Cisco ASR 903 Router System Specifications


Cisco ASR 903 Router

Physical specifications

Height: 5.22 in. (132.6 mm) – 3RU

Width: 17.44 in. (443 mm)

Depth: 9.22 in. (234.2 mm)


34.17 lb (15.5 kg) with two RSPs, DC power supplies, and loaded with a typical combination of interface modulecards
11.2 lb (5.1kg) for an empty chassis

Rack mounts

ETSI rack mount kit

19 in. rack mount kit

Interface modules

6 interface module slots

Route switch processors

2 RSP slots

Fan trays

1 fan tray with fan redundancy

4 dry contact input alarms on the fan tray

Air flow

Side-to-side airflow; inlet on the right side, outlet on the left side when looking from the front

Power supplies

Up to 2 power supplies (AC or DC)

Note: Mixing of AC and DC modules is not supported.

Modules operate in load share mode.

System can operate on a single power supply.

Table 3. Power Specifications


Cisco ASR 903 Router

Power consumption

Maximum input power 630W (including loss). This is equivalent to 2150 BTU per hr.

Typical input power is less than 400W.

AC input voltage and frequency

Voltage range: 85V AC to 264V AC, nominal 115V AC to 230V AC

Frequency Range: 47Hz to 63Hz, nominal 60Hz to 50Hz

DC input voltage

Voltage range: -19.2V DC to -72V DC, nominal -24V DC to -48V DC

Table 4. Environmental Specifications


Cisco ASR 903 Router

Operating environment and altitude1

–40ºC to 65ºC operating temperature (DC operation)

–5ºC to 55ºC operating temperature (AC operation) 2

0ºC to 40ºC operating temperature (AC operation)

–60m to 1800m operating altitude (for full operating temperature range)

Up to 4000m operating altitude (at up to +40ºC temperature)

Relative humidity

5% to 95%, noncondensing

Acoustic noise 3

Acoustic noise peak operation maximum 55 dBA sound pressure level, bystander position for rack mount products at 20ºC operation as measured by ISO 7779 NAIS noise measurement test standard

Acoustic noise peak operation compliant to the Network Equipment Building Standards (NEBS) GR-63-Core Issue 3 sound power level of 78dB at 27ºC operation as measured by the ANSI S12.10/ISO 7779 NAIS noise measurement test standard

Storage environment

Temperature: –40 to +70ºC altitude: 15,000 ft (4570m)


Zone 4

1. Optics used may limit the temperature range.

2. Not more than the following ina one-year period:96 consecutive hours, or 360 hours total, or 15 occurrences.

3. The above are for normal (nonfailure) operation. When operating with a fan failure, the above may be exceeded.

Table 5. Safety and Compliance




UL 60950-1, 2nd edition
CAN/CSA C22.2 No. 60950-1-07 2nd edition
IEC 60950-1, 2nd edition
EN 60950-1, 2nd edition
AS/NZS 60950.1:2003


FCC CFR47 Part 15 Class A

Emissions compliance

EN55022, class A
CISPR22, class A
ICES-003, class A
EN 300 386, class A
VCCI, class A
KN22, class A
EN61000-3-2 to EN61000-3-3

Immunity compliance

EN 300 386
EN 61000-6-1
EN 50082-1
EN 55024
KN 24
EN 50121-4
EN/KN 61000-4-2 to EN/KN 61000-4-6
EN/KN 61000-4-8
EN/KN 61000-4-11


GR-63-CORE Issue 3
GR-1089-CORE Issue 5
SR-3580 NEBS Level 3


ETS/EN 300 119 Part 4
ETS/EN 300 019 – Storage: Class 1.2, Transportation: Class 2.3, In-Use/Operational: Class 3.2
ETS/EN 300 753

Network synchronization

ANSI T1.101
ITU-T G.703 clause 5
ITU-T G.703 clause 9
ITU-T G.781
ITU-T G.813
ITU-T G.823
ITU-T G.824
ITU-T G.8261/Y.1361
ITU-T G.8262
ITU-T G.8264

1. Notable exceptions: Fans do not have filters, and all cabling is provided through the front panel.

Warranty Information

Find warranty information on at the Product Warranties page.

Service and Support

Cisco offers a wide range of services programs to accelerate customer success. These innovative services programs are delivered through a unique combination of people, processes, tools, and partners, resulting in high levels of customer satisfaction. Cisco Services help you protect your network investment, optimize network operations, and prepare your network for new applications to extend network intelligence and the power of your business. For more information about Cisco Services, refer to Cisco Technical Support Services or Cisco Advanced Services.

Cisco is committed to minimizing your total cost of ownership. Cisco offers a portfolio of technical support services to help ensure that Cisco products operate efficiently, remain highly available, and benefit from the most up-to-date system software. The services and support programs described in Table 6 are available as part of the Cisco Carrier Ethernet Switching Service and Support solution and are available directly from Cisco and through resellers.

Table 6. Service and Support

Advanced Services



Cisco Total Implementation Solutions (TIS), available directly from Cisco

Cisco Packaged TIS, available through resellers

Project management
Site survey, configuration, and deployment
Installation, text, and cutover
Major moves, adds, and changes
Design review and product staging
Supplement existing staff
Help ensure functions meet needs
Mitigate risk

Cisco SP Base Support and Service Provider-Based Onsite Support, available directly from Cisco

Cisco Packaged Service Provider- Based Support, available through resellers

24-hour access to software updates
Web access to technical repositories
Telephone support through the Cisco Technical Assistance Center (TAC)
Advance replacement of hardware parts
Facilitate proactive or expedited problem resolution
Lower total cost of ownership by taking advantage of Cisco expertise and knowledge
Minimize network downtime