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Cisco Network Convergence System 5500 Series: NCS-55A1-24Q6H-S Fixed Chassis Data Sheet

Data Sheet

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Updated:September 13, 2019

Available Languages

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    (434.4 KB)
    View with Adobe Reader on a variety of devices
Updated:September 13, 2019


Product overview

Building on the success of the Cisco® Network Convergence System 5501 (NCS-5501), the Cisco Network Convergence System 55A1-24Q6H-S (NCS-55A1-24Q6H-S) offers improvements designed to meet the challenges of the zettabyte era. The NCS-55A1-24Q6H-S provides dense 1GE/10GE/25GE/100GE functionality in a 1-rack-unit package with line-rate MACsec, and Precision Time Protocol (PTP) Synchronous Ethernet (SyncE)/1588 Class B timing. With its ultra-low per-bit power consumption, deep packet buffering, and optimized forwarding architecture the NCS-55A1-24Q6H-S has the flexibility to be deployed across various network roles, including 5G Mobile Backhaul, Top of Rack (ToR), spine-and-leaf, and Converged Interconnect Network (CIN). Built to take full advantage of the advanced capabilities you have come to expect from Cisco IOS® XR, the NCS-55A1 fixed chassis models boast advanced packet classification, segment routing, ultra-wide Equal-Cost Multipathing (ECMP), programmable network management, and telemetry to make your network smarter, faster, and more agile.


Figure 1.           

Cisco NCS-55A1-24Q6H chassis

Cisco IOS XR software overview

The Cisco NCS 5500 Series fixed chassis models are powered by the industry-leading, carrier-class, 64-bit version of Cisco IOS XR Software, designed for operational efficiency, optimized utilization, and service agility (as part of the Cisco Evolved Programmable Network). Cisco IOS XR Software offers rich features such as iPXE boot, auto provisioning, native support for third-party application hosting, machine-to-machine interface, telemetry, and flexible software package delivery.

Software requirement

The Cisco NCS-55A1-24Q6H fixed chassis supports Cisco IOS XR Software Release 6.6.25 and later.


Tables 1 through 4 list key specifications for the Cisco NCS-55A1-24Q6H fixed chassis.

Table 1.             Features and benefits (Cisco IOS XR Software Release 6.6.25 or later)



Integrated interface

1, 10, 25, 40, and 100 Gigabit Ethernet support

Industry-leading carrier-class Cisco IOS XR Software

Visibility and telemetry

Machine-to-machine interface

Application hosting

Flexible platform and packaging



Management ports

Provide easy access to system console

External USB port

Helps simplify image and file management

Solid-state disk (SSD) drive

Memory for storing software image, configuration, logging, and recovery

Power consumption

Ultra-low .37W per gigabit


Redundant fan tray

Redundant AC or DC power supply

Table 2.             Specifications



Chassis product ID



24 ports of 1G/10G

24 ports of 1G/10G/25G

6 ports of 40G/100G

Integrated route processor

Cisco IOS XR 64-bit software running on 6-core x86 CPU at 1.9 GHz

Management ports

2x RJ-45 ports for console and management

Flexible forwarding ports

6x 100G with Quad Small Form-Factor Pluggable (QSFP) 28 optics

QSFP+ optics to support 40G; 4x 10G/25G breakout options available

24x 25G with SFP28 optics

24x 10G with SFP28 optics

SFP+ or SFP optics can be supported on SFP28 ports (refer to the optics supported matrix for details)

System memory

32 GB

SSD drive

128 GB

Timing ports

1 pulse per second (PPS) in/out, 10 MHz in/out, Time of Day (ToD)

Internal Global Navigation Satellite System (GNSS)


Up to 900 Gbps of system throughput

Full line-rate MACsec encryption on all 6x 100G ports and 16x 25G ports

Route scale

Up to 1.1M Forwarding Information Base (FIB) entries

Power and cooling features

2 hot-swappable power supplies providing 1+1 redundancy

2 hot-swappable fan trays providing redundant system cooling

Power consumption

Typical: 330W at 25° Celsius (77°F)

Maximum: 450W at 55° Celsius (131°F)

Physical specifications

Height: 1RU 1.73 in (4.40 cm)

Width:17.4 in (44.20 cm)

Depth: 21.7 in (55.19 cm)

Weight: 23.8 lb (10.8 kg)

Table 3.             Software features supported in Cisco IOS XR Software Release 6.6.25 and later



Layer 2

  Layer 2 switch ports
  IEEE 802.1Q VLAN encapsulation/Q-in-Q encapsulation
  IEEE 802.1ad
  Cisco Bundle Ethernet technology (up to 64 ports per Ethernet Bundle)
  Link Aggregation Control Protocol (LACP): IEEE 802.3ad
  Jumbo frames on all ports (up to 9216 bytes)
  Layer 2 ingress Access Control List (ACL)
  Layer 2 AC-AC cross-connect
  Ethernet Flow Point (EFP) and VLAN trunks
  Virtual Router Redundancy Protocol (VRRP)

Layer 3

  IPv4 and IPv6 unicast
  Layer 3 interfaces: Physical and sub-interfaces
  Routing protocols: static, Open Shortest Path First (OSPFv2), OSPFv3, Intermediate System to Intermediate System (IS-IS), IS-ISv6, and Border Gateway Protocol (BGP)
  64-way Equal-Cost Multipath (ECMP)
  Layer 3 ingress and egress IPv4 ACL and IPv6 ACL
  Bidirectional Forwarding Detection (BFD)
  Cisco Ethernet bundle technology (up to 64 ports per Ethernet bundle)
  LACP: IEEE 802.3ad
  Jumbo frame support (up to 9216 bytes)
  Layer 3 VPN

Multiprotocol Label Switching (MPLS)

  Label switching
  Label Distribution Protocol (LDP)
  MPLS Traffic Engineering
  Ethernet over MPLS (EoMPLS)

Segment Routing (SR)

  Segment routing–based transport
  IS-IS extensions to segment routing
  OSPF extensions to segment routing
  BGP egress peering engineering
  Segment Routing Traffic Engineering (SR-TE)
  Segment Routing Topology-Independent Loop Free Alternatives (TI-LFA)

Quality of Service (QoS)

  Hierarchical QoS
  Ingress classification based on Class of Service (Layer 2), IP Differentiated Service Code Point (DSCP) (Layer 3), IP ACL (Layer 3/4), IP precedence (type of service) (Layer 3)
  DSCP marking
  8 queues for user traffic
  Support for priority queuing


  Zero-Touch Provisioning (ZTP), iPXE
  Configuration management
  Network Configuration Protocol (NETCONG/YANG model)


  Provides comprehensive network security features, including ACLs; control-plane protection; management plane protection; routing authentications; Authentication, Authorization, and Accounting (AAA), and TACACS+; Secure Shell (SSH) Protocol; Simple Network Management Protocol (SNMP) v3; and Route Policy Language (RPL) support
  Layer 2 ingress ACLs
  Layer 3 ingress ACLs


  MPLS Operations, Administration, and Maintenance (OAM) (Label Switched Path [LSP] ping, LSP traceroute)
  Ethernet OAM

Table 4.             Environmental properties



Normal operating temperature

Port-S intake supply: 32° to 104°F (0° to 40°C); Port-S exhaust supply: 32° to 95°F (0° to 35°C)

Non-operating (storage) temperature

-40° to 158°F (-40° to 70°C)

Operating humidity

5% to 95% (noncondensing)

Storage (relative) humidity

5% to 95% at 40°C per NEBS GR-63-Core


0 to 9842 ft (0 to 3000 m)

Power inputs

Worldwide ranging AC (90 to 265V, 50 to 60 Hz)

Worldwide ranging DC (-40V to -72V)


Front to back

Back to front

Regulatory standards compliance

Table 5.             Regulatory standards compliance: Safety and EMC



Regulatory compliance

Products should comply with CE Markings according to directives 2004/108/EC and 2006/95/EC


  UL 60950-1 Second Edition
  CAN/CSA-C22.2 No. 60950-1 Second Edition
  EN 60950-1 Second Edition
  IEC 60950-1 Second Edition

EMC: Emissions

  47CFR Part 15 (CFR 47) Class A
  AS/NZS CISPR22 Class A
  CISPR22 Class A
  EN55022 Class A
  ICES003 Class A
  VCCI Class A
  KN22 Class A
  CNS13438 Class A

EMC: Immunity

  KN 61000-4 series


The product is RoHS-6 compliant with exceptions for leaded-Ball Grid-Array (BGA) balls and lead press-fit connectors.

Supported transceiver modules

Refer to the Cisco NCS 5500 Series supported transceivers module matrix. https://www.cisco.com/c/en/us/support/interfaces-modules/transceiver-modules/products-device-support-tables-list.html.

Ordering information

Table 6.            Ordering information

Part number

Product description



NCS55A1 Fixed 24X10G, 24X25G & 6X100G chassis


NCS 5500 AC 1100W Power Supply Port-S Intake / Front-to-back


NCS 5500 AC 1100W Power Supply Port-S Exhaust/Back-to-Front


NCS 5500 DC 1100W Power Supply Port-S Exhaust/Back-to-Front


NCS 5500 DC 950W Power Supply Port-S Intake / Front-to-back


NCS 5500 Accessory Kit for 1RU Chassis


NCS 5500 Fan Tray 1RU Chassis Port-S Intake / Front-to-back


NCS 5500 Fan Tray 1RU Chassis Port-S Exhaust/Back-to-Front


Cisco IOS XR IP/MPLS Core Software


Cisco IOS XR IP/MPLS Core Software 3DES


The Cisco NCS 5500 Series has a 1-year limited hardware warranty. The warranty includes hardware replacement with a 10-day turnaround from receipt of a Return Materials Authorization (RMA).

Service and support

Cisco offers a wide range of services to help accelerate your success in deploying and optimizing the Cisco NCS 5500 Series. These innovative Cisco Services offerings are delivered through a unique combination of people, processes, tools, and partners, and they are focused on helping you increase operating efficiency and improve your data center network. Cisco Advanced Services uses an architecture-led approach to help you align your data center infrastructure with your business goals and achieve long-term value. Cisco Smart Net Total Care® Service helps you resolve mission-critical problems with direct access at any time to Cisco network experts and award-winning resources. With this service, you can take advantage of the Cisco Smart Call Home service, which offers proactive diagnostics and real-time alerts on your Cisco NCS 5500 Series. Spanning the entire network lifecycle, Cisco Services offerings help increase investment protection, optimize network operations, support migration operations, and strengthen your IT expertise.

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