Product Overview

The Foxboro A2H124-24FX P0973BJ​ is a managed, Layer 2, stackable Fast Ethernet fiber switch purpose-built for Foxboro I/A Series distributed control system (DCS) control networks. Housed in a standard 19-inch 1U rack-mount chassis, it provides 24 fixed 100BASE-FX multimode fiber ports with MT-RJ connectors plus two Gigabit SFP/Mini-GBIC uplink slots and an out-of-band management port. The Foxboro A2H124-24FX P0973BJ​ is a factory-configured Foxboro variant of the Enterasys SecureStack A2 family, preloaded with DCS-oriented Quality of Service (QoS) rules that prioritize Modbus TCP and proprietary control frames for deterministic delivery across the plant network.Engineered as an edge-aggregation device, the Foxboro A2H124-24FX P0973BJ​ replaces clusters of零散 fiber media converters with a single, centrally managed switch. Its 24 fiber ports directly terminate multimode links from remote I/A field hardware—including FBM modules and FCP field control processors—eliminating electrical continuity between nodes and providing complete galvanic isolation. This optical architecture blocks motor-driven electrical noise, ground-loop currents, and transient voltage spikes that routinely corrupt copper-based control traffic in refinery, boiler, and chemical-plant environments.With a switching capacity of up to 12.8 Gbps, a forwarding rate of 6.5 Mpps, an 8K MAC address table, and support for up to 255 IEEE 802.1Q VLANs (4,096 VLAN IDs in a stack), the Foxboro A2H124-24FX P0973BJ​ is designed for high-density, deterministic industrial networking. Up to eight units can be stacked into a single logical device with one IP address, closed-loop redundancy, and automatic configuration and firmware synchronization. This makes it exceptionally well suited to installed-base support, where a failed unit can be hot-swapped without manual reconfiguration.

Technical Specifications