Product Type | Router |
Product Family | Cisco Network Convergence System (NCS) 5500 |
Model | NCS 55A1 Fixed Chassis, Spare |
Form Factor | Rack-mountable - 1U |
Weight | 27.56 lbs |
Power Requirements | Internal power supply, 700 W operational consumption |
Power Redundancy | Yes |
Installed Power Supplies | 2 (installed) / 2 (max) |
System RAM | 32 GB |
Internal Storage | 128 GB |
Processor Speed | 1.9 GHz |
Operating System | Cisco IOS XR 6.6.25 |
Cisco NCS 55A1 Fixed Chassis, 48x25G + 6x100G, Spare


Key Benefits

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- Offers exceptional port density with 48x 25G and 6x 100G ports in a compact 1U form factor, maximizing space efficiency in high-demand deployments
- Delivers industry-level scalability and performance with 1.8 Tbps throughput and 2 million FIB route capacity, meeting modern data center and service provider needs
- Includes advanced security (MACsec), traffic engineering, and QoS features to support complex, multi-tenant networks securely and efficiently
Product Overview
The Cisco NCS 55A1 Fixed Chassis is a high-performance, rack-mountable data center and service provider router engineered for intensive throughput and scalability requirements. It features a compact 1U form factor while offering 48x SFP+/SFP28 ports supporting 1G to 25G and 6x QSFP28/QSFP+ ports supporting 40G or 100G, providing significant port density within minimal rack space. The system delivers 1.8 Tbps throughput and supports routing scales up to 2 million FIB entries, making it ideal for core and aggregation layers in IP/MPLS networks.
Its feature-rich list includes support for IS-IS, BGP, OSPFv2/v3, MPLS, and enhanced network functions. Remote manageability is achieved through SNMP 3 and SSH, while Zero Touch Provisioning (ZTP) enables streamlined deployments. Designed with internal power redundancy and three fan trays, the device ensures high availability. Compliance with international standards such as IEEE and UL 60950 furthers global deployment suitability.
Use cases include metro Ethernet aggregation, 5G backhaul infrastructure, and data center interconnect scenarios needing advanced tools like MACsec, HQoS, and Ethernet OAM. With jumbo frame support (up to 9216 bytes), MACsec encryption, and L3VPN capabilities, the NCS 55A1 is ready for enterprise and service provider challenges. A one-year warranty with advanced part replacement adds peace of mind to critical environments.
Specifications
Product Overview
Wireless Features
Wi-Fi Support |
Compliance & Origin
Country of Origin | CHINA / UNITED STATES |
TAA Compliant | Yes |
Certifications | UL 60950-1; EN 60950-1; IEC 60950-1; FCC CFR47 Part 15; VCCI Class A; ICES-003 Class A; GR-1089-CORE; GR-63-CORE; RoHS 6/6; EN55024; EN 300 386; KN22 Class A; EN 61000-3-2; EN 61000-3-3; KN 61000-4; CISPR 22/24 Class A |
Advanced Security Features
Encryption Support | MACsec with AES |
Authentication Methods | TACACS+, AAA |
Access Control | Access Control Lists (ACLs) |
Supported Security Protocols | IEEE 802.1ae (MACsec), IEEE 802.1x |
Network Segmentation | L3VPN, Ethernet VPN (EoMPLS) |
Quality of Service (QoS) | Hierarchical QoS (HQoS), IP Precedence, DSCP Marking |
Redundancy Protocols | HSRP, VRRP |
Interfaces
Total Ethernet Ports | 48 x 1/10/25G SFP+/SFP28, 6 x 40/100G QSFP+/QSFP28 |
Console Ports | 1 x RJ-45 |
Management Ports | 2 x RJ-45 |
USB Ports | 1 x USB |
Data Link Protocols | Gigabit Ethernet, 10 Gigabit Ethernet, 25 Gigabit Ethernet, 40 Gigabit Ethernet, 100 Gigabit Ethernet |
Maximum Throughput | 1.8 Tbps |
Maximum Route Scale | Up to 2 million FIB entries |
Jumbo Frame Support | Up to 9216 bytes |
Physical & Environmental
Width | 17.3 in |
Depth | 26.8 in |
Height | 1.7 in |
Minimum Operating Temperature | 32 °F |
Maximum Operating Temperature | 104 °F |
Operating Humidity Range | 5 - 95% (non-condensing) |
Cooling System | Three built-in fan trays |
Cloud Management & Licensing
Cloud Management Capabilities | Supports Zero Touch Provisioning (ZTP) |
Local/Remote Management Interfaces | SNMP v3, SSH, CLI |
Included Management Software | Cisco IOS XR 6.6.25 |
Licensing Model | Based on Cisco Smart Licensing (subscription-based) |