Introduction

As demand grows for non-cloud connected data centers to support sensitive workloads, hyperscaler operators are now deploying AI infrastructure at customer locations and private data centers, with the need for fiber and copper connectivity and conversion.

The Challenge

A leading hyperscale data center provider was approached by customers seeking private, on-premises AI infrastructure. These organizations required high-performance AI processing environments that could operate entirely within their own facilities, without reliance on cloud connectivity.

The primary drivers behind this shift included data security, regulatory compliance, and latency-sensitive applications. By keeping AI workloads local, customers ensured that sensitive data never left the premises while enabling real-time processing for mission-critical operations.

However, designing these private AI environments introduced a significant infrastructure challenge.

The data center network enforced a strict fiber-only policy for inter-rack connectivity, eliminating copper Ethernet cabling between racks to improve performance, reduce interference, and align with modern data center architecture standards. Within these environments, a critical design constraint emerges:

1. No copper Ethernet cabling is permitted between racks. 

Most of the AI processing devices have RJ-45 copper ports only, including:

• • AI compute servers
  • Power Distribution Units (PDUs)
  • Console servers

2. Existing 1Gb RJ45 copper management interfaces. This creates a gap between:

• • • Copper-based device interfaces
    • Fiber-based inter-rack connectivity requirements

3. Additional challenges include:

• • • Supporting up to 37 copper-to-fiber conversion per chassis
    • Maintaining signal integrity across rack-to-rack distances
    • Ensuring centralized visibility and control across distributed racks
    • Designing for scalable deployments (multiple AI and management racks)
    • Avoiding unmanaged point solutions that increase operational complexity

In short, network architects had to bridge copper-based management interfaces into a fiber-only interconnect architecture, without sacrificing manageability or scalability.

The Solution

To support this architecture, the managed iConverter® chassis-based media converter was chosen to performing high-density copper-to-fiber conversion with centralized network management and scalability.

At the AI Server Rack (Top-of-Rack Integration)

Each AI server rack integrates:

• A managed iConverter chassis populated with copper-to-fiber media converter modules
  • AI server management ports
  • Dual PDUs
  • Console server

Two deployment scenarios are supported:

Option 1: Fiber-Enabled Management Switch

If the management switch includes native fiber (SFP) ports:

• • Fiber links from AI racks connect directly into the switch
  • No additional conversion required

Benefits:

• • Simplified architecture
  • Reduced hardware footprint
  • Lower latency and fewer failure points

Option 2: Copper-Based Management Switch

If the management switch only supports RJ45 copper:

• • A second iConverter chassis is deployed in the management rack
  • iConverter 2GXT media converters are used in order to save on rack space, with 2 copper and 2 fiber ports on each converter
  • Fiber connections are converted back to copper
  • Copper links connect into the management switch

Benefits:

• Enables reuse of existing switching infrastructure
• Provides flexibility in mixed environments
• Maintains full fiber transport between racks

Omnitron’s iConverter solution enables:

• • Up to 37 copper-to-fiber conversions per rack
  • Clean aggregation of all management traffic into fiber uplinks
  • Elimination of copper cabling between racks

A dedicated iConverter GX/TM2 management module provides:

• • In-band management over fiber
  • Centralized monitoring of all installed modules

Fiber Transport Between Racks

• • Each AI rack transmits management traffic over multiple fiber links (e.g., 8 fibers)
  • Fiber runs connect directly to a centralized management rack
  • This design ensures:
    • EMI immunity
    • Long-distance reliability
    • Compliance with fiber-only interconnect policies

At the Central Management Rack

Scalability & Architecture

• • Each chassis supports high-density modular configurations (e.g., 19 modules)
  • Fully managed platform enables:
    • Remote configuration
    • Fault monitoring
    • Link status visibility

Key Benefits

• • Fiber-Only Inter-Rack Design
    Maintains strict compliance with fiber infrastructure standards while supporting legacy copper interfaces. Fiber is chosen for multiple reasons – Security (harder to tap fiber than copper cables), EMI immunity and electrical isolation, distance between racks and for future-proofing as bandwidth needs increase.
•  
  • High-Density Conversion at the Edge
    Up to 37 device connections per rack without adding switch complexity, and room for growth with more slots that can be populated with more managed media converters.
•  
  • Centralized Management
    Full visibility and control of distributed media converters via managed chassis modules.
•  
  • Flexible Integration
    supports both fiber-native and copper-based management switching environments.
•  
  • Scalable Architecture
    Easily expands to support additional racks and AI workloads without redesign.
•  
  • Improved Reliability
    Fiber eliminates EMI concerns and improves signal integrity across racks and distances.

Cost and Operational Complexity

A chassis of media converter modules centralizes copper‑to‑fiber conversion; installation is straightforward (power up the chassis, plug in copper and fiber cables), and 10/100/1000‑Mbps media converters are generally the most cost‑effective way to extend fiber. Because each chassis can handle up to 37 fiber ports, a 2U chassis replaces numerous NIC or switch upgrades, reducing space in the rack, capital expenditure and operational complexity. The managed media converter chassis strikes a great balance between cost and simplicity.

The Result

This solution enables the hyperscale data center to provide a solution that met all customer requirements:

• • Localized compute and storage
  • Fiber-based rack interconnects
  • Seamless integration of copper-based management interfaces
  • Centralized, scalable network management

The result was a future-ready architecture that aligns with hyperscaler design principles while meeting the strict requirements of high-security, disconnected environments.

Why Omnitron Systems

Omnitron was selected for several critical reasons:

• • Proven Reliability
    iConverter products are designed for mission-critical applications where downtime is not an option.
  • Pre- and Post-Sales Technical Support
    Omnitron provided hands-on design assistance, ensuring the solution was optimized for both performance and scalability.
  • Lifetime Warranty on all iConverter Media Converters
    Omnitron media converters come with a lifetime warranty and 7/24 Technical Support
  • Made in the USA
    Fully compliant with TAA, BAA, and NDAA requirements, ensuring safe and secure networks

Product Overview