The Extreme Networks A4H124-24FX, also distributed under the Schneider Electric Foxboro part number P0973JN, is an enterprise-grade, high-density Fast Ethernet switch module. Featuring 24 100BASE-FX SFP fiber ports, this hardware is engineered to deliver secure, long-distance optical connectivity and high-speed data transmission in noise-heavy environments. Frequently integrated into specialized industrial control architectures like the Foxboro I/A Series or System-Platform networks, this module ensures reliable, deterministic communication between control room human-machine interfaces (HMIs), engineering workstations, and field control processors.
Technical Datasheet
Product Identification
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Brand: Extreme Networks / Schneider Electric Foxboro
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Model: Extreme A4H124-24FX
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Part Number: P0973JN
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Device Type: Managed Fast Ethernet Switch Module
Interface & Performance Specs
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Total Ports: 24 Ports
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Port Type: 100BASE-FX Small Form-factor Pluggable (SFP) fiber slots
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Uplink Connectivity: Supports optional high-speed Gigabit uplink expansion modules
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Layer Support: Layer 2 switching with advanced Layer 3 routing features
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Forwarding Rate: Wire-speed performance across all fiber channels
Physical & Environmental Properties
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Form Factor: 1U Rack-mountable enclosure
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Weight: Approximately 4.2 kg (9.2 lbs)
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Cooling System: Integrated internal cooling fans for front-to-back airflow
Application Fields
The A4H124-24FX (P0973JN) is primarily deployed in massive industrial complexes where traditional copper Ethernet fails due to distance limits or electromagnetic interference.
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Distributed Control Systems (DCS): Serving as the core communication backbone for Schneider Foxboro I/A Series systems, linking control mesh nodes.
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Oil & Petrochemical Refining: Connecting remote terminal units (RTUs) across expansive plant yards via fiber optics to prevent spark hazards.
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Power & Utility Substation Automation: Deploying inside control rooms to aggregate high-speed data feeds from intelligent electronic devices (IEDs).
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Large-Scale Manufacturing: Providing high-isolation networking across multiple production floors heavily impacted by industrial motor noise.
Product Instructions & Guidelines
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Rack Mounting: Secure the switch chassis into a standard 19-inch electronics rack using the provided mounting brackets. Ensure at least 1U of clearance above and below the unit to maintain optimal thermal ventilation.
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SFP Transceiver Installation: Insert compatible 100BASE-FX SFP optical transceivers into the front panel slots until they click firmly into place. Remove the protective dust caps only when you are ready to connect the fiber optic patch cables.
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Power Setup: Connect the unit to a clean, uninterruptible power supply (UPS) system matching the voltage specifications on the rear rating plate. For high-availability systems, utilize dual redundant power feeds if the chassis configuration supports it.
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Initial Configuration: Access the management command-line interface (CLI) via the dedicated RJ-45 console port using a terminal emulation program. Configure core parameters including the management IP address, subnet mask, VLAN assignments, and Spanning Tree Protocol (STP) parameters to prevent network loops.
Frequently Asked Questions (Q&A)
Q: What is the difference between the A4H124-24FX and the P0973JN part numbers? A: They refer to the exact same physical hardware. “A4H124-24FX” is the original manufacturer model designation by Extreme Networks, while “P0973JN” is the specialized part catalog number assigned by Foxboro / Schneider Electric for tracking inside industrial control systems.
Q: Can I use standard copper RJ-45 transceivers in these SFP slots? A: The primary architecture of this module is optimized for 100BASE-FX fiber links. While certain multi-rate SFP slots accept copper transceivers, you must verify that the transceiver firmware matches the specific port speed requirements of the switch configuration.
Q: Does this switch support network redundancy protocols? A: Yes, it fully supports industry-standard redundancy protocols such as Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), and Link Aggregation (LACP) to create fault-tolerant fiber rings and redundant uplinks.
Q: How do the status LEDs assist in troubleshooting? A: The front panel features individual Link/Activity LEDs for each SFP slot. A solid green light indicates a valid physical link with the connected device, flashing green shows active data transmission, and an amber indicator typically signifies a port error, configuration mismatch, or disabled state.
Related Product News
As manufacturing facilities continue to transition towards unified Industrial Internet of Things (IIoT) platforms, IT-OT convergence networks are seeing increased stress on infrastructure. Industry technical briefs highlight a push toward reinforcing existing fiber infrastructures, such as the Extreme A4H series, rather than executing costly overhauls.
Network engineers working within Foxboro environments are prioritizing advanced network segmentation techniques—like strict Virtual Local Area Network (VLAN) mapping and Access Control Lists (ACLs)—directly on these switch modules. This trend focuses on blocking lateral cybersecurity movements between business systems and critical process control loops without requiring the physical replacement of reliable, hardened Layer 2/3 hardware assets.
