Extreme Networks A4H124-24FX / P0973JN – 24‑Port 100BASE‑FX Managed Fiber Switch for Control and DCS Cabinets

The model A4H124-24FX points to a 24‑port 100BASE‑FX fiber switch from Extreme Networks’ A4 family, and the P0973JN suffix typically indicates an OEM mounting/termination kit used in process‑control cabinets. From my experience, this setup fits plants standardizing on fiber all the way to the panel—compressor buildings, turbine halls, or long runs across MCCs—where EMI is a headache and deterministic links matter. You might notice that pairing the switch with the right cabinet kit usually makes a swap almost routine: the hardware lands where your drawings expect it, and the network comes up with fewer surprises.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in-stock; no more than 1 month at the latest
• Payment method: 50% advance payment; full payment for delivery
• Express delivery methods: FedEx, UPS, DHL

Key Features

• 24× 100BASE‑FX fiber access – Ideal for cabinet‑to‑cabinet links in high‑EMI areas; helps keep noise off the control network.
• L2 managed feature set – Typically supports VLANs, RSTP/MSTP, IGMP snooping/querier, port trunking, and port security for neat segmentation.
• Industrial cabinet friendly – P0973JN kit appears to include the hardware to mount, power, and label the switch cleanly in DCS panels.
• Deterministic behavior – Fiber uplinks and fast convergence features help stabilize historian, HMI, and I/O gateway traffic.
• Serviceable design – Front LEDs, out‑of‑band/Web/CLI access (model‑dependent) make changeovers and audits quicker.

Technical Specifications

The table lists the characteristics you usually see on A4H124‑24FX switch assemblies integrated for DCS/plant networks. If you share your power standard, fiber connector type, and uplink needs, we’ll validate the exact kit before shipment.

Application Fields

• DCS/PLC networks interconnecting racks across MCCs and process units via fiber
• Compressor and turbine buildings where copper noise susceptibility is unacceptable
• Condition monitoring and SIS/ESD subnets that benefit from strict L2 segmentation
• Cabinet retrofits standardizing on fiber access switches in brownfield plants

Advantages & Value

• EMI resilience – 100FX links typically ride clean next to VFDs and starters, avoiding the common copper pitfalls.
• Predictable integration – The P0973JN kit keeps mounts, power, and labeling familiar to maintenance teams.
• Operational continuity – Fast RSTP/MSTP convergence and IGMP control help keep HMIs and historians steady.
• Spares strategy – Stable lead times, known firmware, and a 365‑day warranty make outage planning easier.

Installation & Maintenance

• Power & grounding – Use a clean feed and bond PE per site EMC rules; check input selector if a multi‑range PSU is fitted.
• Fiber handling – Respect bend radius; clean connectors before mating; label both ends to speed fault isolation.
• Network setup – Define VLANs, RSTP domains, and IGMP roles; save and back up the running config right after commissioning.
• Segregation – Keep fiber and power routing separate; avoid tight door‑hinge bends and sharp duct exits.
• PM routines – Review logs and error counters, verify link state/duplex, and keep a tested spare with the same firmware line.

Quality & Certifications

• CE and RoHS compliant build (typical for Extreme A4 family)
• UL/cUL suitability for control cabinets (model/kit dependent)
• Manufacturer’s warranty: 12 months from shipment

If you share your cabinet power standard (AC or DC), fiber connector type (SC/ST/SFP), and uplink requirements, we’ll confirm the A4H124‑24FX / P0973JN configuration so it drops into your network and passes checks the first time.