Cornelis Omni-Path Switches: технические характеристики и документация
Abstract
Omni-Path Architecture (OPA) is a high-performance fabric designed for artificial intelligence (AI), high-performance computing (HPC), and large-scale data center environments. Built to deliver low-latency, high-bandwidth communication at scale, OPA enables efficient scaling from small clusters to fabrics supporting more than 100,000 nodes while maximizing compute utilization and reducing total cost of ownership. The Cornelis CN5000 Omni-Path Switch is Lenovo's current OPA switch offering, delivering 48 ports of 400Gbps connectivity in air-cooled and liquid-cooled configurations.
This document introduces the Lenovo Omni-Path switch portfolio and provides the associated ordering information. It is intended for technical specialists, sales specialists, sales engineers, IT architects, and other IT professionals who want to learn more about Lenovo-supported Omni-Path networking solutions and their use in IT environments.
Introduction
Cornelis Omni-Path switches are high-performance interconnect solutions designed to meet the demand of modern HPC and AI workloads. They provide low-latency, high-bandwidth communication across compute nodes, enabling efficient scaling and workload distribution. With features like adaptive routing, congestion control, and advanced monitoring, Omni-Path technology supports reliable and cost-effective infrastructure for data-intensive environments.
The Cornelis CN5000 Switch is a 400 Gbps Omni‑Path scale‑out fabric designed for modern AI and HPC data centers, delivering lossless, congestion‑free throughput, ultra‑low latency, and exceptional scalability to more than 100K nodes while maximizing compute efficiency and lowering TCO.
Through features such as credit‑based flow control, link‑level retransmissions, fine‑grained adaptive routing, and advanced real‑time telemetry, the CN5000 ensures low tail latency, eliminates packet loss, and provides precise network visibility, making it an ideal interconnect for performance‑critical, parallelized workloads
Figure 1. Cornelis CN5000 48-Port OPA 400Gbps Switch
Did you know?
Omni-Path Architecture eliminates packet loss and minimizes network congestion through built-in credit-based flow control and adaptive routing. Unlike Ethernet-based AI fabrics that often require extensive tuning to achieve lossless operation, CN5000 Omni-Path fabrics are designed to deliver predictable low-latency performance at scale, helping AI and HPC clusters achieve higher utilization and faster time-to-results.
Ordering information
The following table lists the Cornelis Omni-Path switches orderable from Lenovo.
| Model | Description* |
|---|---|
| Air-cooled switches | |
| 7DMQCTO1WW | Cornelis CN5000 48-Port OPA 400Gbps Air-Cooled Switch PSE |
| 7DMQCTO2WW | Cornelis CN5000 48-Port OPA 400Gbps Air-Cooled Switch oPSE |
| Water-cooled switch | |
| 7DMQCTO4WW | Cornelis CN5000 48-Port OPA 400Gbps Liquid-Cooled Switch oPSE |
* PSE = Port Side Exhaust; oPSE = Opposite Port Side Exhaust
Each switch comes standard with two 2m C14 power cables. Other cable lengths are also available as listed in the Power cables section.
Lenovo EveryScale
Lenovo EveryScale is a framework for designing, manufacturing, integrating, and delivering data center solutions, with a focus on High Performance Computing (HPC), Technical Computing, and Artificial Intelligence (AI) environments.
With EveryScale, Lenovo pre-tests and validates a wide selection of Lenovo and third-party components, including Cornelis Omni-Path switches, to create a "Best Recipe" of components and firmware levels that work seamlessly together as a solution. From this testing, customers can be confident that these best-practice solutions run optimally for their workloads and are tailored to their specific needs.
Lenovo EveryScale hardware is pre-integrated, pre-cabled, and pre-loaded, optionally with an OS image, and is tested at the rack level during manufacturing. This process ensures reliable delivery and minimizes installation time in the customer data center.
With EveryScale, customers can focus their efforts on maximizing business value instead of consuming valuable resources to design, optimize, install, and support the infrastructure required to meet business demands.
Learn more by reading the Lenovo EveryScale product guide.
Front and rear views
The following figure shows the front of the CN5000 Switch:
Figure 2. Cornelis CN5000 Switch front view
The following figure shows the rear of the CN5000 Switch with air cooling:
Figure 3. Cornelis CN5000 Switch rear view air-cooled
The following figure shows the rear of the CN5000 Switch with liquid cooling:
Figure 4. Cornelis CN5000 Switch rear view water-cooled
Features
The CN5000 Omni-Path Switch has the following key features:
- 48 ports of 400Gb connectivity
- 38.4Tb full duplex bandwidth
- Throughput greater than 800 million packets/second
- Less than 1µs MPI latency
- Supports more than 100K node clusters
- Optimization for message rate and latency
- Virtual lanes (VLs): Configurable from one to four VLs plus one management VL
- Low-Latency bit error recovery and optional correction
- Security: Secure key EEPROM, Secure Boot
- Hot swappable/replaceable fans & power supplies
Built for Scale and Efficiency
The CN5000 Switch delivers lossless, congestion-free networking at scale, supporting up to 500,000 endpoints through key architectural features: credit-based flow control, link-level retransmissions, fabric-level congestion management, and multipath routing without in-order delivery constraints. These innovations ensure low tail latency, eliminate packet loss, and drive higher compute utilization and lower TCO.
Optimized for AI and HPC Workloads
The CN5000 Switch delivers 400Gb of bandwidth per port and is purpose-built for AI training, inference, and large-scale HPC performance demands. It provides ultra-low latency and congestion-free throughput, accelerating time-to-results for generative and agentic AI workloads. With exceptional efficiency and architectural robustness, CN5000 switches are the ideal fabric for parallelized compute environments and mission-critical HPC applications.
Reliability, Adaptability, and Efficiency
Consistent, reliable network performance is critical for AI and HPC applications. The CN5000 Switch enhances system-wide efficiency with advanced error correction and dynamic workload-aware traffic management, ensuring adaptability to changing communication patterns and sustained performance under load.
Advanced Telemetry for Intelligent Network Management
Equipped with cutting-edge telemetry capabilities, the CN5000 Switch provides real-time network insights and fine-grained visibility to optimize workload performance. By continuously analyzing traffic patterns, identifying congestion points, and dynamically adjusting network flows, it ensures smooth, high-efficiency operation, even in the most complex compute environments.
With industry-leading precision network intelligence, the CN5000 Switch enables greater control, efficiency, and performance across any scale. In contrast to RoCEv2 and legacy InfiniBand implementations, the CN5000 switch delivers lossless, congestion-free networking that scales with the demands of AI and HPC clusters.
Omni-Path Architecture
CN5000 Architecture delivers lossless and congestion-free data transmission with credit-based flow control and dynamic fine-grained adaptive routing. It is designed for maximum performance, reliability, scalability, and data integrity with dynamic lane scaling and optimized link protection. The CN5000 Switch requires the use of CN5000 SuperNIC adapters to fully enable its congestion-free, lossless operation at scale.
Air-cooled or Liquid-cooled Configurations
Available switch configurations:
- Air-cooled model with Port-side exhaust (PSE) fans - air flow travels from the power side to the port side of the switch
- Air-cooled model with Opposite-port-side exhaust (oPSE) fans - air flow travels from the port side to the power side of the switch
- Water-cooled model with 94% of heat removed using liquid cooling (PSE orientation for power supply fans)
Advanced Congestion Management
- Fine-Grained Adaptive Routing (FGAR)
- Static Dispersive Routing (SDR)
- Lossless, congestion-free networking through fabric-wide adaptive routing and incast-aware flow control
Management Features
- Integrated OpenBMC-based management
- Redfish protocol and data model/schema support
- In-band and out-of-band management options
- Command line interface through 10/100/1000 BASE-T Ethernet
Specifications
The following table shows the specifications of each switch. There are two variants for each switch:
- PSE (Port Side Exhaust): Airflow is Back-to-front - Air enters from power side and exits at port side
- oPSE (Opposite / reversed airflow): Airflow is Front-to-back - Air enters from port side and exits at power side
| Feature | CN5000 Switch |
|---|---|
| Airflow | PSE (Fan-to-Port, F2P) oPSE (Port-to-Fan, P2F) |
| Typical use | AI training, AI inference, and High-Performance Computing (HPC) scale-out clusters. |
| Form factor | 1U |
| Throughput (FD) | 38.4 Tbps full-duplex aggregate bandwidth |
| Ports | 48x QSFP112 Omni-Path ports, 400 Gbps each |
| Additional ports | 1x 1GbE management (10/100/1000BASE-T) 1x USB-A serial port |
| Native speeds supported | 400 Gbps and 200 Gbps operation |
| Breakout options | 32 ports support subdivision into 2x 200 Gbps links, enabling up to 80 physical connections (64x 200 Gbps + 16x 400 Gbps). |
| Power supplies | 2x hot-swap redundant AC power supplies with Anderson Saf-D-Grid 400 (SDG400) sockets |
| Fans | 2x hot-swap fan trays, each with 6x fans (three pairs in tandem configuration) |
| Dimensions (H x W x D) | 44mm x 438mm x 663mm (1.7" x 17.2" x 26.1") |
| Weight | Air cooled: 13.97 kg (30.8 lb) Water cooled: 15.79 kg (34.8 lb) |
Networking cables
The following tables lists the supported cables.
In this section:
- Optical cables
- Copper cables
- RJ45 cables
Cable length restrictions: The following cable length restrictions apply when configuring the CN5000 switch:
| Connection | DAC Cables | ACC Cables | AOC Cables |
|---|---|---|---|
| Switch-to-SuperNIC | up to 2.5m | up to 5m | up to 100m |
| Switch-to-Switch | up to 1m | up to 4m | up to 100m |
Use of the LLR (link-level retransmission) feature is subject to additional restrictions. Contact Cornelis for details.
Optical cables
| Part number | Feature | Description | Maximum supported | ||
|---|---|---|---|---|---|
| CN5000 Air PSE |
CN5000 Air oPSE |
CN5000 Water |
|||
| Intel OPA 100 Active Optical QSFP28 Cables | |||||
| 4X97A11034 | B22J | 5m Intel OPA 100 Series Active Optical QSFP28 Low Power Cable | 48 | 48 | 48 |
| 4X97A11035 | B22K | 10m Intel OPA 100 Series Active Optical QSFP28 Low Power Cable | 48 | 48 | 48 |
| 4X97A11036 | B22L | 15m Intel OPA 100 Series Active Optical QSFP28 Low Power Cable | 48 | 48 | 48 |
| 4X97A11037 | B22M | 20m Intel OPA 100 Series Active Optical QSFP28 Low Power Cable | 48 | 48 | 48 |
| Cornelis CN5000 400G QSFP-QSFP AOC Active Cable-Straight | |||||
| 4X97B11687 | CDHF | Cornelis 5m CN5000 400G QSFP112 AOC Active Cable-Straight | 48 | 48 | 48 |
| 4X97B11688 | CDHE | Cornelis 10m CN5000 400G QSFP112 AOC Active Cable-Straight | 48 | 48 | 48 |
| 4X97B09876 | CBPR | Cornelis 20m CN5000 400G QSFP112 AOC Active Cable-Straight | 48 | 48 | 48 |
| 4X97B11689 | CDHD | Cornelis 30m CN5000 400G QSFP112 AOC Active Cable-Straight | 48 | 48 | 48 |
Copper cables
| Part number | Feature | Description | Maximum supported | ||
|---|---|---|---|---|---|
| CN5000 Air PSE |
CN5000 Air oPSE |
CN5000 Water |
|||
| Intel OPA 100 Passive Copper QSFP28 Cables | |||||
| 00WE031 | AU0E | 0.5m Intel OPA 100 Series Passive Copper QSFP28 Cable | 48 | 48 | 48 |
| 00WE039 | AU0G | 1m Intel OPA 100 Series Passive Copper QSFP28 Cable | 48 | 48 | 48 |
| 00WE047 | AU0J | 1.5m Intel OPA 100 Series Passive Copper QSFP28 Cable | 48 | 48 | 48 |
| 00WE051 | AU0K | 2m Intel OPA 100 Series Passive Copper QSFP28 Cable | 48 | 48 | 48 |
| Cornelis CN5000 400G QSFP-QSFP DAC Passive Cable-Straight | |||||
| 4X97B09871 | CBPM | Cornelis 1m CN5000 400G QSFP112 DAC Passive Cable-Straight | 48 | 48 | 48 |
| 4X97B09872 | CBPN | Cornelis 1.5m CN5000 400G QSFP112 DAC Passive Cable-Straight | 48 | 48 | 48 |
| 4X97B09873 | CBPP | Cornelis 2m CN5000 400G QSFP112 DAC Passive Cable-Straight | 48 | 48 | 48 |
| 4X97B12425 | CDQW | Cornelis 3m CN5000 400G QSFP112 DAC Passive Cable-Straight | 18 | 18 | 18 |
| Cornelis CN5000 400G QSFP- QSFP ACC Active Cable-Straight | |||||
| 4X97B09874 | CBPQ | Cornelis 5m CN5000 400G QSFP112 ACC Active Cable-Straight | 48 | 48 | 48 |
| Cornelis CN5000 400G QSFP112 to 2x 200G QSFP56 Passive Copper Splitter Cable | |||||
| 4X97B11690 | CDHC | Cornelis 1m CN5000 400G QSFP112 - 2x200G QSFP56 DAC Passive Cable-Split | 32 | 32 | 32 |
| 4X97B11691 | CDHB | Cornelis 1.5m CN5000 400G QSFP- 2x200G QSFP56 DAC Passive Cable-Split | 32 | 32 | 32 |
| 4X97B11692 | CDHA | Cornelis 2m CN5000 400G QSFP- 2x200G QSFP56 DAC Passive Cable-Split | 32 | 32 | 32 |
| Cornelis CN5000 400G QSFP112 to 2x 200G QSFP56 Active Copper Splitter Cable | |||||
| 4X97B11937 | CDHH | Cornelis 3m CN5000 400G QSFP- 2x200G QSFP56 ACC Active Cable-Split | 32 | 32 | 32 |
| 4X97B11938 | CDHG | Cornelis 5m CN5000 400G QSFP- 2x200G QSFP56 ACC Active Cable-Split | 32 | 32 | 32 |
RJ45 cables
| Part number | Feature | Description | Maximum supported | ||
|---|---|---|---|---|---|
| CN5000 Air PSE |
CN5000 Air oPSE |
CN5000 Water |
|||
| CAT6 Green cables | |||||
| 00WE123 | AVFW | 0.75m Green Cat6 Cable | 1 | 1 | 1 |
| 00WE127 | AVFX | 1.0m Green Cat6 Cable | 1 | 1 | 1 |
| 00WE131 | AVFY | 1.25m Green Cat6 Cable | 1 | 1 | 1 |
| 00WE135 | AVFZ | 1.5m Green Cat6 Cable | 1 | 1 | 1 |
| 00WE139 | AVG0 | 3m Green Cat6 Cable | 1 | 1 | 1 |
| 90Y3718 | A1MT | 10m Green Cat6 Cable | 1 | 1 | 1 |
| CAT6 Blue cables | |||||
| 90Y3721 | A1MU | 10m Blue Cat6 Cable | 1 | 1 | 1 |
| 90Y3730 | A1MX | 25m Blue Cat6 Cable | 1 | 1 | 1 |
| CAT6 Yellow cables | |||||
| 90Y3715 | A1MS | 10m Yellow Cat6 Cable | 1 | 1 | 1 |
| 90Y3724 | A1MV | 25m Yellow Cat6 Cable | 1 | 1 | 1 |
| CAT5e Blue Cables | |||||
| 40K5679 | 3801 | e1350 .6 Meter Blue Ethernet Cable | 1 | 1 | 1 |
| 40K8785 | 3802 | 1.5 Meter Blue Ethernet Cable | 1 | 1 | 1 |
| 40K5581 | 3803 | 3m Blue Cat5e Cableupdate | 1 | 1 | 1 |
| 40K8927 | 3804 | e1350 10 Meter Blue Ethernet Cable | 1 | 1 | 1 |
| 40K8930 | 3805 | 25m Blue Cat5e Cable | 1 | 1 | 1 |
| CAT5e Green Cables | |||||
| 40K5643 | 3797 | e1350 1.5 Meter Green Ethernet Cable | 1 | 1 | 1 |
| 40K5793 | 3798 | e1350 3 Meter Green Ethernet Cable | 1 | 1 | 1 |
| 40K5794 | 3799 | 10m Green Cat5e Cable | 1 | 1 | 1 |
| 40K8869 | 3800 | 25m Green Cat5e Cable | 1 | 1 | 1 |
| CAT5e Yellow Cables | |||||
| 40K8933 | 3791 | e1350 .6 Meter Yellow Ethernet Cable | 1 | 1 | 1 |
| 40K8951 | 3792 | e1350 1.5 Meter Yellow Ethernet Cable | 1 | 1 | 1 |
| 40K8801 | 3794 | 10 Meter Yellow Ethernet Cable | 1 | 1 | 1 |
| 40K8807 | 3795 | 25m Yellow Cat5e Cable | 1 | 1 | 1 |
Rack mount kit
The Cornelis CN5000 OPA switches include a rack mount kit (rail kit). The rails support an adjustable depth from 26 inches to 32 inches.
Power cables
The Cornelis switches come standard with two 2m power cables (feature CJTM, as listed in the table below). Additional power cables can be ordered if needed.
| Part number | Feature | Description | Maximum supported | ||
|---|---|---|---|---|---|
| CN5000 Air PSE |
CN5000 Air oPSE |
CN5000 Water |
|||
| None | CCQF | 0.5m, 10A/100-250V, Anderson SDG400 to C14 Rack Power Cable | 2 | 2 | 2 |
| None | CCQG | 1.5m, 10A/100-250V, Anderson SDG400 to C14 Rack Power Cable | 2 | 2 | 2 |
| None | CJTM | Included - 2m C14 IEC 60320 to Saf-D-Grid 400 Rack Power Cable | 2* | 2* | 2* |
| None | CCQH | 2.8m, 10A/100-250V, Anderson SDG400 to C14 Rack Power Cable | 2 | 2 | 2 |
* Two 2m power cables are included with the switches
Operating environment
The switches have the following operating characteristics:
- Normal operating temperature range:
- 10 to 35°C (up to 900 m above sea level)
- Temperature is derated 1°C per 175 m above 900 m)
- Storage temperature range: -40 to 70 °C
- Normal operating humidity: 5% to 85%, non-condensing
- Non-operating humidity: 5% to 95%, non-condensing
- Altitude:
- Operating: 0 to 3,000 m
- Storage: 0 to 12,000 m
- Acoustics (noise) - Air-cooled switch: 72.50 dB @ 25 °C
Water requirements (liquid-cooled switch):
- Up to 94% heat capture to liquid depending on cable configuration
- ASIC, QSFP, and voltage regulators are liquid-cooled
- Quick disconnect couplings: no-drip/no-spill Staubli SCG06 with color indicators for flow
- Leak detection is indirect: Relies on the rack-level Coolant Distribution Unit (CDU) to monitor flow parameters (flow rate, pressure, temperature, etc.) to indicate a potential risk of a leak and to alert the user
- Liquid types supported:
- Deionized (DI) Water with additives
- Propylene Glycol mixture, 25% maximum (PG25)
- Ethylene Glycol mixture, 25% maximum (EG25)
- Flow rate: 1.5 to 3.0 LPM
- Max Inlet Temperature: 45 °C (113 °F)
- Temperature rise (ΔT): 3.0 - 5.0°C
- Maximum system pressure guidance: 3 bar at the system connection
Related product families
Product families related to this document are the following:
- Omni-Path Switches
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