Enterasys A4H124-24TX | Foxboro P0973JM Switch

Description

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Important brand relationship: Enterasys A4H124-24TX and Foxboro P0973JM are closely related identifiers for the same type of industrial Ethernet switch used in Foxboro I/A Series installations. Enterasys was the networking equipment manufacturer whose switches were incorporated into Foxboro control-system solutions. Foxboro, now part of Schneider Electric, used specific Enterasys hardware under Foxboro/I/A Series part numbers.

Therefore, P0973JM should not be interpreted as a completely different Ethernet-switch design simply because the label says Foxboro. In procurement, it is useful to cross-reference both identifiers: Enterasys A4H124-24TX ↔ Foxboro P0973JM. However, the customer’s existing nameplate should always be checked before treating the two numbers as a guaranteed one-for-one replacement.

FOXBORO-A4H124-24TX front

Key Technical Specifications

The A4H124-24TX belongs to the Enterasys A4H family of Ethernet switches and provides 24 copper 10/100BASE-TX ports. In a Foxboro I/A Series environment, the same physical networking hardware may be identified by the Foxboro-specific P0973JM part number.

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FOXBORO-A4H124-24TX label 2

FOXBORO-A4H124-24TX label

Product Introduction (Anti-Template)

A failed network switch inside a Foxboro I/A Series cabinet can create a surprisingly large troubleshooting problem: the controllers may remain healthy while operator stations, I/O nodes, or other networked devices suddenly disappear. The Enterasys A4H124-24TX, commonly cross-referenced with Foxboro P0973JM, serves as an Ethernet switching component for this type of control-system infrastructure.

The brand relationship deserves attention. Enterasys was a networking equipment manufacturer, while Foxboro used selected Enterasys switches as part of its industrial control-system architecture and assigned its own Foxboro part numbers to equipment supplied for I/A Series applications. So when a buyer asks for , finding an Enterasys A4H124-24TX may be relevant—but the nameplate, firmware, port configuration, and hardware revision still need to be checked. Honestly, this is one of those cases where a clear photo can prevent a costly wrong-part shipment.

FOXBORO-A4H124-24TX sideview

QC, Procurement & Logistics SOP

1. Inbound Verification
   Check the physical label for , , serial number, hardware revision, power-rating information, and MAC address. Photograph the front and rear panels before the unit enters stock.
2. Cross-Reference Verification
   Confirm that the customer’s requested Foxboro number is and that the physical switch corresponds to the hardware. Do not rely solely on a generic A4H-family description.
3. Live Rig Testing
   Apply the appropriate power and verify startup, status LEDs, Ethernet link detection, port activity, switching between connected test devices, and management access where applicable. Test multiple copper ports rather than checking only one.
4. Firmware & Configuration Check
   Record the installed firmware version if accessible. If the replacement is being used in an existing Foxboro I/A network, preserve the customer’s original network configuration, VLAN settings, IP-related parameters, and management credentials through the approved maintenance process.
5. QA & Anti-Static Packaging
   Protect the Ethernet connectors, front-panel controls, and PCB assembly against ESD and mechanical shock. Use an anti-static bag and sufficient internal cushioning to keep the switch from moving during transportation.
6. Global Logistics & Export Compliance
   Export documentation should state the actual equipment identification, such as Enterasys Ethernet Switch / Foxboro . HS classification should be reviewed against the actual network-switch function and destination customs requirements. For urgent control-system maintenance, air freight is generally the practical choice; secure packaging is important for both air and sea freight.

Technical Pitfalls & Integration Warnings

1. Enterasys vs. Foxboro Part-Number Confusion
   A customer may search for , while the physical hardware carries . This does not necessarily indicate two unrelated products. Foxboro’s industrial control-system supply chain used networking hardware from Enterasys and identified equipment with Foxboro-specific part numbers.
2. Firmware / Configuration Mismatch
   Two physically similar A4H switches can behave differently when deployed into an established control network if firmware or configuration differs. Before replacement, record the existing switch configuration whenever possible.
3. Port and Network Topology Errors
   A 24-port switch provides plenty of physical connections, but moving cables to different ports can complicate network troubleshooting if port-specific configuration, VLAN assignments, or documentation is involved. Label every cable before removal.
4. ESD and Power Handling
   Disconnect power according to the site’s approved maintenance procedure before replacing the switch. Protect the unit from static discharge during handling, particularly when the cabinet contains other sensitive control electronics.

FOXBORO-A4H124-24TX backside

Frequently Asked Questions (FAQ)

Q1: “Is Enterasys the same as Foxboro ?”

They are closely associated identifiers, with the Enterasys model being the underlying networking hardware and serving as a Foxboro/I/A Series procurement identifier.

For a replacement order, the safest description is:

Foxboro / Enterasys

However, confirm the customer’s physical nameplate and hardware revision before declaring an absolute one-for-one replacement.

Q2: Why does a Foxboro control system have an Enterasys switch inside it?

Because the two companies served different parts of the system architecture.

• Enterasys: networking hardware manufacturer
• Foxboro: industrial automation/control-system provider
• I/A Series: Foxboro distributed control system
• : Foxboro-specific equipment identification
• : Enterasys hardware model

In practical terms, Foxboro integrated or supplied Enterasys networking equipment as part of its control-system infrastructure.

Q3: “How many Ethernet ports does have?”

The provides 24 × 10/100BASE-TX copper Ethernet ports.

Q4: “Can I replace a with any ?”

Not automatically. Confirm:

• Exact model
• Hardware revision
• Firmware version
• Power-input specification
• Foxboro part number
• Existing network configuration
• Port configuration
• Physical mounting arrangement

A generic may look correct but still require configuration work before it can be returned to service in an established control network.

Q5: Does replacing the switch affect the Foxboro controllers?

The switch itself normally provides network connectivity rather than performing the controller’s control logic. However, removing it can disconnect multiple network nodes simultaneously. If the network is part of an active control or supervisory architecture, replacement should be planned as a controlled maintenance activity rather than treated like replacing an ordinary office switch.

Q6: “Can this Ethernet switch be hot-swapped?”

Do not assume it can be hot-swapped merely because Ethernet equipment is modular. The correct procedure depends on the Foxboro cabinet design and network architecture. Isolate the affected equipment according to the approved maintenance procedure and confirm whether network redundancy is available before disconnecting the existing switch.

Q7: What information should I send when requesting ?

Please send:

• Photo of the complete switch
• Foxboro part number
• Enterasys model number
• Hardware revision
• Firmware version, if available
• Power-rating label
• Front and rear panel photos
• Quantity required
• Destination country
• Required delivery date

For this particular item, I strongly recommend listing both numbers on the product page: “Enterasys / Foxboro .” This catches buyers searching from either the networking-hardware side or the Foxboro spare-parts side, while making the relationship between the two identifiers clear.

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