CAB-EL224-C19-BR=: What Is It and Where Is It
What Is the CAB-EL224-C19-BR=? The CAB-EL224-C19-...
What Is the Cisco ASR-903?
The ASR-903 is a 1RU (rack unit) aggregation router optimized for service providers and enterprises requiring carrier-grade Ethernet at the network edge. It consolidates Layer 2 and Layer 3 services, supporting high-density Ethernet, TDM, and microwave backhaul in a compact form. Unlike larger ASR 9000 Series routers, it prioritizes cost-efficiency and space savings without sacrificing critical features like timing synchronization or MPLS.
Core Technical Specifications
- Throughput: Up to 20 Gbps with Cisco Quantum Flow Processor.
- Interfaces: 8x 1G/10G SFP+ slots, 4x 1G/10G Combo ports, and optional T1/E1 or microwave modules.
- Timing: Supports SyncE and IEEE 1588v2 for 4G/LTE and 5G fronthaul/backhaul.
- Software: Runs Cisco IOS XE for compatibility with SD-WAN and NFV architectures.
Key Use Cases and Deployment Advantages
1. Mobile Backhaul for 4G/5G Networks
The ASR-903 delivers sub-500µs latency and precise timing, critical for RAN (Radio Access Network) connectivity.
2. Business Ethernet Aggregation
Consolidates branch traffic with advanced QoS, VLAN stacking (Q-in-Q), and MPLS Layer 2 VPNs.
3. Utility and Transportation Networks
Hardened for industrial environments, it operates in extended temperatures (-40°C to 65°C) and supports DC power.
ASR-903 vs. Competing Compact Routers
| Feature | ASR-903 | Typical Competitors |
|---|---|---|
| Timing Accuracy | ±50ns with SyncE | ±200ns (requires external clock) |
| Modularity | Hot-swappable service modules | Fixed port configurations |
| Energy Use | 60W max (AC) / 40W (DC) | 80–100W average |
| Scalability | Seamless upgrade to ASR 920/ASR 9000 | Limited to chassis capacity |
Addressing Common Deployment Questions
-
Can the ASR-903 Replace Legacy TDM Switches?
Yes. Its CESoPSN and SAToP support allows gradual migration from T1/E1 to IP-based backhaul. -
Is It Compatible with Cisco SD-WAN?
Yes, via integration with vManage controllers for zero-touch provisioning and centralized policies. -
How to Ensure Redundancy?
Deploy dual power supplies and use NSF/SSO (Non-Stop Forwarding/Stateful Switchover) for sub-second failover.
Where to Purchase the ASR-903
For guaranteed compatibility and Cisco Smart Net coverage, the ASR-903 router is available through itmall.sale, including optional modules and licensing bundles.
Final Perspective from the Field
Having deployed ASR-903 routers in rural telecom expansions, their value lies in operational simplicity. One project saw a 50% reduction in truck rolls for tower site maintenance due to its remote diagnostics and modular design. While not a fit for 400G core roles, it’s a workhorse for edge use—where ruggedness and timing precision outweigh raw throughput. Cisco’s commitment to backward compatibility ensures even older TDM modules remain viable, making it a pragmatic choice for hybrid network transitions.