Description
The Enterasys A4H124-24FX, identifiable by the part number P0973JN, is a high-performance, stackable Fast Ethernet switch designed for the edge of the enterprise network. This 24-port fiber-optic switch provides secure, wire-speed switching and is ideal for environments requiring high-density fiber connectivity for enhanced security or long-distance data transmission. Part of the Enterasys A-Series, the A4H124-24FX supports advanced Layer 2 features, including VLAN tagging, Quality of Service (QoS), and robust security protocols. Its stackable design allows for easy scalability, enabling multiple units to be managed as a single logical entity to simplify administration and increase port density.
Technical Specifications and Datasheet
Model Number: A4H124-24FX Part Number: P0973JN Product Series: A-Series A4 Port Configuration: 24 x 100Base-FX (Fiber) Uplink Ports: 2 x 10/100/1000Base-T (Copper) or SFP Combo ports Stacking Support: Built-in stacking ports (Up to 8 units per stack) Switching Capacity: 12.8 Gbps Forwarding Rate: 9.5 Mpps MAC Address Table: 16,000 entries Dimensions: 441 mm x 368 mm x 44 mm (1U Rack Mount) Weight: 5.2 kg Country of Origin: USA / China Operating Temperature: 0 to 50 °C Input Voltage: 100-240V AC, 50-60 Hz
Application Fields
The A4H124-24FX is specifically tailored for secure and distributed network architectures:
- Fiber-to-the-Desk (FTTD): Providing secure fiber connectivity directly to high-security workstations.
- Industrial Campus Networks: Connecting remote buildings where copper distance limits are exceeded.
- Government and Military: Leveraging fiber’s resistance to EMI and eavesdropping for secure data handling.
- Education: Aggregating departmental networks in university settings requiring robust stacking and management.

Enterasys A4H124-24FX P0973JN
Product Instructions and Usage
This switch is designed for standard 19-inch rack mounting using the included ear brackets. To begin installation, ensure adequate ventilation around the chassis. For fiber connections, use compatible SC or SFP transceivers (depending on the combo port configuration) and verify that the fiber type (multi-mode or single-mode) matches your cable infrastructure. Management is typically conducted through the Console port or via a web-based GUI and CLI using SNMP. To stack multiple A4 switches, use the dedicated stacking cables; the system will automatically negotiate a “Manager” unit. Always ensure the firmware versions are synchronized across the stack for stable performance.
Common Questions and Answers (Q&A)
What is the primary benefit of the FX ports on this switch? The 100Base-FX ports use fiber optics, which allows for much longer cable runs (up to 2km on multi-mode) compared to the 100-meter limit of copper, while providing immunity to electrical interference.
Does the A4H124-24FX support Power over Ethernet (PoE)? No, the 24FX fiber model does not support PoE, as fiber optic cables do not conduct electrical power.
How many switches can I stack together? You can stack up to 8 Enterasys A-Series switches, providing a high-density, high-availability edge solution with a single management IP.
Can I use the SFP ports and the copper ports at the same time? The two 10/100/1000 ports are typically “Combo” ports. If you plug an SFP transceiver into one, the corresponding copper port is disabled.
Is this switch manageable? Yes, it is a fully manageable Layer 2 switch supporting Enterasys NetSight management software, CLI, and web-based management.
Explore Related Components
For technical documentation and to procure the A4H124-24FX or other Enterasys networking hardware, please visit our product repository.
Recommended Similar Models
- ENTERASYS A4H124-24 (24-Port 10/100 Copper variant)
- ENTERASYS B5G124-24 (Stackable Gigabit Ethernet Switch)
- ENTERASYS A2H124-24FX (Earlier generation fiber switch)
- ENTERASYS C5K125-24 (High-performance core/aggregation switch)
- ENTERASYS MGBIC-LC01 (SFP 1000Base-SX Mini-GBIC Module)


