Full English Description for Cisco ASR 903

1. Official Short Order Description (Datasheet Standard Format)

ASR 903: Cisco ASR 900 Series 3RU Shallow-Depth Fully Redundant Modular Carrier-Grade Aggregation Services Router, dual hot-swappable RSP Route Switch Processor slots for SSO/NSF control-plane high availability, six OIR-capable Interface Module (IM) expansion slots supporting mixed 1G/10G/40G/100G fiber, T1/E1/T3 channelized and OC POS trunk modules, integrated multi-layer precision timing subsystem (BITS, SyncE, IEEE 1588v2 PTP, 10MHz/1PPS/ToD), dual redundant hot-swappable AC/-48VDC power supplies and single hot-swappable fan tray, modular Cisco IOS XE operating system with full Carrier Ethernet EVPN/VPLS, MPLS L3VPN, SAToP/CESoP TDM pseudowire, hardware IPsec/MACsec acceleration and mobile transport hierarchical QoS, DC-powered variants support rugged extended temperature (-40°C ~ +65°C), purpose-built for 4G/5G RAN pre-aggregation, medium service provider POP multi-tenant aggregation, utility FAN substation convergence and large-scale microwave transport aggregation deploymentsCisco.

2. Complete Detailed Product Overview

Product Line Positioning

Cisco ASR 903 is the high-end modular 3RU shallow ETSI chassis within the ASR 900 IOS XE mobile transport carrier router family, positioned above single-RSP ASR 902. It is the only mid-size platform with dual redundant RSP control planes and six IM expansion slots, delivering full carrier-grade hardware redundancy and maximum I/O scalability for converged TDM/Ethernet transport. Optimized for 300mm shallow telecom cabinets widely deployed in cell huts, roadside enclosures and rural utility substations, it addresses mid-scale aggregation sites requiring zero-downtime control-plane failover, multi-service mixed-media convergence and comprehensive synchronous timing for 3GPP-compliant mobile backhaul networksCisco.

Modular FRU Hardware Architecture (Core Differentiators vs ASR 902)

Dual Redundant RSP Route Switch Processor Slots (Exclusive to ASR 903)

Two independent hot-swappable FRU slots supporting ASR903-RSP1A/RSP1B integrated control+forwarding modules, enabling 1+1 SSO Stateful Switchover and NSF Nonstop Forwarding to eliminate control-plane single points of failure. Each RSP integrates industrial x86 CPU, dedicated Carrier Ethernet ASIC data plane, hardware crypto co-processor and complete network timing circuitry:

ASR903-RSP1A: Base 2GB DDR memory, max 55 Gbps aggregate IMIX forwarding throughput
ASR903-RSP1B: Upgraded 4GB DDR memory, max 55 Gbps aggregate IMIX forwarding throughput

Memory expansion not supported on base RSP1A/RSP1B; dual RSP deployment supports ISSU In-Service Software Upgrade for zero-downtime firmware updatesCisco.

Six Hot-Swap Interface Module (IM) Slots (OIR Supported)

All six IM slots support online insertion and removal without chassis power cycle, fully compatible with full ASR 900 IM portfolio for hybrid legacy TDM + modern high-speed fiber convergence:

High-speed Ethernet IMs: 8×10GE SFP+, 2×40GE QSFP, 1×100GE CPAK fiber uplink modules
Copper/Gigabit IMs: 8×1GE RJ45, 4×1GE SFP access modules
Channelized trunk IMs: 16×T1/E1, 4×T3 serial voice/signaling trunk modules
Optical IMs: OC-3 / OC-12 POS/ATM long-haul fiber transport modules

All IM ports support IEEE 802.1Q VLAN trunking, MACsec hardware encryption, SyncE clock recovery and wire-speed QoS offloadCisco.

Integrated Multi-Standard Precision Timing Interfaces (Critical for Mobile Transport)

RJ45 BITS timing port for Stratum 3 carrier network clock synchronization
RJ45 ToD (Time of Day) port for GNSS GPS timing message distribution
Dual mini-coax connectors: 10 MHz reference clock + 1 PPS pulse input/output for external GPS receivers

Fully compliant with ITU-T G.8265.1 / G.8275.1 PTP telecom profiles, SyncE and TDM clock recovery to eliminate clock drift in synchronous 4G/5G fronthaul/backhaul transport networksCisco.

Management, Alarm & Auxiliary Interfaces

Dual-mode console access: RJ45 serial console + Mini-USB Type B port for local offline configuration
1×10/100/1000BASE-T isolated out-of-band management Ethernet port for separated remote monitoring
2-channel isolated dry-contact digital alarm I/O terminals for cabinet door sensors, environmental monitoring and external equipment fault alerting
Dual USB 2.0 Type-A host ports for license import, offline config backup and firmware image upload
Front-panel multi-color LED array monitoring primary/backup RSP health, IM link activity, power supply, fan tray, timing lock and critical/minor/major fault alarmsCisco.

Processor, Memory & Storage

Integrated RSP Forwarding ASIC: Fixed embedded data plane on each RSP with fixed 55 Gbps aggregate IMIX forwarding capacity, native hardware offload engines for SAToP/CESoP TDM pseudowires, IPsec/MACsec tunnel encryption, stateful NAT and multicast replication.
Control Plane Memory: Base 2GB DDR (RSP1A) / upgraded 4GB DDR (RSP1B) ECC memory, optimized for thousands of mobile transport pseudowires and MPLS VPN tunnel instances.
Storage: 8GB rugged industrial eUSB onboard flash storage for IOS XE modular boot images, crash dumps and persistent system logging; no internal HDD/SSD expansion bay supportedCisco.

Power, Mechanical & Environmental Specifications

Form Factor: Standard 3RU 19-inch / ETSI shallow-depth rack-mount chassis, optimized for 300mm deep telecom equipment cabinets
Cooling: Single hot-swappable OIR fan tray with side-to-side default airflow; optional air plenum converts to front-to-back airflow for standard data center racks
Power Supply Architecture: Dual hot-swappable wide-range AC (85–264VAC) / DC (-48VDC) power supplies for N+1 carrier-grade power redundancy
Operating Temperature:
- DC-powered SKUs: Continuous -40°C ~ +65°C for unmanned outdoor cell cabinets and remote industrial enclosures
- AC-powered SKUs: Continuous -5°C ~ +55°C indoor equipment rooms
Storage Temperature: -40°C ~ +70°C
Humidity: 10%–95% RH non-condensing operating humidity
Compliance: UL 62368-1, IEC/EN 60950-1, NEBS GR-1089 / GR-63, FCC Class A, CE certified for carrier central office, cell site and utility substation deploymentCisco.

Official Performance Benchmarks

Aggregate IMIX forwarding throughput: Fixed maximum 55 Gbps with RSP1A/RSP1B modules
Hardware-accelerated IMIX IPsec VPN throughput: Max 8 Gbps
Maximum concurrent SAToP/CESoP TDM pseudowires: Up to 2,000 tunnels
Supported MPLS L2VPN/EVPN/VPLS service instances: Up to 5,000
Full hardware offload support for NBAR2 AVC deep packet inspection, hierarchical MQC QoS, MACsec link encryption and sub-second BFD fast convergenceCisco.

Software & Core Supported Capabilities (Modular IOS XE)

Converged TDM + All-IP 4G/5G Mobile RAN Transport Suite

SAToP and CESoP pseudowire encapsulation for legacy T1/E1 circuit migration; full 3GPP-compliant IP backhaul transport for multi-generation BTS, NodeB and eNodeB radio traffic over fiber, microwave and DSL links.
Carrier-Grade MPLS & Carrier Ethernet Services

IPv4/IPv6 dual-stack forwarding, BGP, OSPF, IS-IS, BFD fast convergence; complete MPLS L3VPN, EVPN and VPLS feature stack for multi-tenant operator transport networks and enterprise private WANs.
Multi-Layer Precision Timing Stack for Synchronous Transport

Native SyncE, IEEE 1588v2 PTP grandmaster/slave, BITS, 10MHz/1PPS and ToD timing subsystems to eliminate clock drift required for cellular voice, data and control signaling.
Integrated Carrier-Grade Security Stack

Hardware-accelerated IPsec/MACsec tunnel encryption, next-generation stateful zone firewall, large-scale CGNAT address translation, AAA RADIUS/TACACS+, TLS encrypted remote management and IT/OT traffic segmentation for utility convergence networks.
Hierarchical Mobile QoS & Traffic Visibility

NBAR2 full application classification, multi-level MQC traffic shaping/policing with strict priority queues for mobile voice and control signaling, IP SLA performance monitoring, NetFlow/IPFIX streaming telemetry for centralized transport network capacity planning.
Enhanced Carrier-Grade High Availability Mechanisms (Dual RSP Exclusive)

NSF Nonstop Forwarding, SSO Stateful Switchover between primary/backup RSP modules, ISSU In-Service Software Upgrade for zero-downtime firmware updates, HSRP/VRRP gateway redundancy, sub-second BFD link failure detection, dual redundant power and fan architectures for unmanned remote sites.
Mass Automation & Programmability

CLI/SSH access, NETCONF/YANG data models, SNMP MIB support, compatible with Cisco IoT Field Network Director and NSO Network Services Orchestrator for large-scale cell-site zero-touch provisioningCisco.

Typical Deployment Scenarios

4G LTE/5G mobile pre-aggregation RAN gateways requiring dual RSP control-plane redundancy, medium service provider remote POP multi-tenant aggregation CPE, rural power grid utility substation FAN aggregation routers, solar/wind renewable energy large remote monitoring hubs, microwave convergence nodes combining dozens of TDM circuits and high-speed fiber radio backhaul, unmanned roadside ITS remote connectivity sites needing six IM expansion slots, shallow ETSI cabinet mounting and wide-temperature hardened hardware.

3. E-commerce Short Marketing Description

Cisco ASR 903 3RU Shallow-Depth Modular Carrier Aggregation Services Router, dual redundant RSP1A/RSP1B control-plane FRUs up to 55Gbps throughput, RSP with 2GB/4GB DDR memory, six hot-swappable IM interface slots supporting 1G/10G/40G/100G fiber and T1/E1/T3/OC trunk modules, comprehensive BITS/PTP/SyncE multi-standard timing subsystem, dual redundant AC/-48VDC PSU & single OIR fan tray, DC variants support -40°C ~ +65°C rugged temperature range, modular IOS XE OS with full Carrier Ethernet EVPN/VPLS, MPLS L3VPN, SAToP/CESoP TDM pseudowire and hardware IPsec acceleration, ideal for 4G/5G mobile pre-aggregation, medium service provider POP and utility substation FAN transport deployments with full control-plane HA.

4. Product Catalog Keyword Tags

Cisco, ASR 903, ASR 900 Series, 3RU Shallow ETSI Modular Carrier Aggregation Router, Dual Redundant RSP Route Switch Processors, Six Hot-Swap IM Interface Slots, Multi-Rate 1G/10G/40G/100G Fiber Support, Integrated BITS / IEEE 1588v2 PTP / SyncE Timing, Dual Redundant AC/DC Power Supplies, OIR Hot-Swap Fan Tray, -40°C ~ +65°C Extended Rugged Temp (DC Models), NEBS GR-1089 Certified, IOS XE Modular Operating System, Carrier Ethernet EVPN/VPLS, MPLS L3VPN Multi-Tenant Support, SAToP/CESoP TDM Pseudowire Transport, Hardware IPsec/MACsec Acceleration, 4G/5G Mobile Pre-Aggregation Gateway, Medium Service Provider POP CPE, Utility Smart Grid FAN Aggregation Router

Naming Rule Explanation

ASR = Aggregation Services Router carrier-grade converged transport platform running IOS XE
903 = High-capacity 3RU shallow-depth modular carrier edge chassis (six IM slots, dual redundant RSP control plane, superior expansion and HA capability vs single-RSP four-slot ASR 902)
No U suffix = Original legacy RSP1A/RSP1B hardware generation (distinguished from upgraded high-throughput ASR 903U unified U-series platform with A900U-RSP2A modules)


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