I. Basic Model Description
Brand: Enterasys (formerly Kecang, later affiliated with Extreme, commonly used network devices in industrial control DCS/SIS systems)
Series: SecureStack A2 Stackable Network Management Switch
Full Model: A2H124-24FX-RH
24FX: 24 100M optical fiber electrical ports; RH = Redundant Hot-swap Power version, supports external redundant power module
Status: The original factory has discontinued production. Most available parts on the market are disassembled or refurbished spare parts. Widely used for Foxboro I/A, Honeywell PKS DCS systems.
Complete Port Layout (1U Rack Mount)
24×100BASE-FX SC optical ports
100Mbps multimode fiber, anti-electromagnetic interference, suitable for power plants and chemical plants with strong electromagnetic cabinets; multimode fiber transmission distance 2km
2×10/100/1000BASE-T gigabit RJ45 stackable/uplink ports
Used for switch stacking, connecting to core switches, and accessing upper-level HMI servers
2× gigabit SFP optical slots (Mini-GBIC)
Optional gigabit single/multi-mode optical modules for long-distance backbone connection
DB9 RS232 Console debugging serial port
Local CLI command-line configuration, fault troubleshooting
RPS redundant power interface
RH model exclusive, can be connected to hot-swappable redundant power supply, standard for industrial control high-reliability scenarios
Hardware Core Parameters
Switch capacity: 8.8 Gbps
Packet forwarding rate: 6.5 Mpps
MAC address table: 8K entries
Processor: MPC8241 266MHz
Memory: 128MB SDRAM / 16MB Flash
Overall power consumption: ≤29W
Cooling: No fan natural cooling, low failure rate, maintenance-free
Size: 1U rack 441×44×210mm
Weight: Approximately 2.8kg
Power supply: Standard 100–240V AC input, RH supports external 48VDC redundant power supply
Layer 2 Network Management Function
1. Basic Switching
IEEE802.1Q VLAN (up to 255), port Trunk, port aggregation LACP, port isolation, 802.3x traffic control
2. Real-time Control QoS
802.1p 8-level service priority, ensuring DCS control messages, SOE events, interlock signals are prioritized for forwarding
3. Network Security
802.1X port authentication, ACL access control, port security MAC binding, broadcast storm suppression
4. Maintenance Management
Web graphical interface, CLI serial port, Telnet, SNMP v1/v2/v3, log recording, port status monitoring, fault alarm
Industrial Adaptation Advantages
All-fiber access: 24 isolation 100Mbps optical fiber ports, avoiding electromagnetic interference from power plant frequency converters and high-power motors, preferred for DCS IO substation long-distance networking
No fan design: No rotating components, suitable for 7×24-hour continuous operation, reducing on-site failure points
Stacking expansion: Multiple A2 series stacking, unified management to expand the number of optical ports
RH redundant power version: Critical SIS safety network can be powered by dual power supplies, avoiding interlock interruption due to single power supply failure
Wide temperature operation: Standard 0℃~50℃, stable operation in cabinet-enclosed industrial environment
Typical Application Scenarios Foxboro I/A Series, Honeywell Experion PKS DCS control system optical network
Power plants, chemical plants, oil and gas stations SIS safety instrumented system backbone switch
Factory-wide long-distance instrument optical networking, remote IO substation convergence
Plant-level monitoring SCADA, flue gas analysis, fire and gas FGS system data transmission
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