Westermo L308F2 Modules - 3640-1450 L308F2-SM-LC20

Technical Dossier

Product Details And Specifications

Westermo L308F2 Series Technical Notes

The Westermo L308F2 series comprises ruggedized managed Ethernet switch modules engineered for deployment in mission-critical industrial environments including chemical processing plants, nuclear power stations, petroleum refineries, and offshore platforms. Built on Westermo's WeOS (Westermo Operating System) platform, the L308F2 line delivers deterministic Layer 2/Layer 3 switching with hardware-enforced redundancy protocols (FRNT, RSTP, MRP) that meet IEC 61850 substation automation and IEC 62443 cybersecurity requirements. The series occupies a significant installed base across European and Asian heavy industry, where long equipment lifecycles (15–25 years) make spare parts availability a primary procurement concern. The 3640-1450 L308F2-SM-LC20 specifically provides single-mode fiber uplink capability over LC connectors at 20 km reach, making it the standard selection for inter-building backbone links within large industrial campuses.

The Evolution of L308F2 Architecture

Early L308F2 units shipped with WeOS 3.x firmware, which supported basic VLAN segmentation and SNMP v2c management. Subsequent firmware generations (WeOS 4.x, 5.x) added IPv6 routing, IEEE 802.1X port authentication, and enhanced FRNT ring recovery times below 20 ms. The transition from WeOS 3.x to 4.x introduced breaking changes in CLI syntax and SNMP MIB structure, requiring configuration migration scripts for brownfield upgrades — a compatibility consideration that remains relevant for sites still operating mixed firmware environments.

As of 2024, the L308F2 series is classified as a mature product line. Westermo continues to provide security patches and spare parts under its extended lifecycle program, but new feature development has migrated to the DDW-142 and MRX-5 platforms. For greenfield projects, Westermo recommends the Lynx 5000 series. For existing L308F2 installations, DriveKNMS provides long-term maintenance inventory to bridge the gap until full platform migration is feasible.

L308F2 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Westermo L308F2 managed switch module series, organized by functional category:

Fiber Uplink Modules — Single-Mode

• 3640-1450 L308F2-SM-LC20: Single-mode fiber uplink module, LC connector, 20 km reach, 100 Mbps, for L308F2 chassis slot.
• 3640-1451 L308F2-SM-LC40: Single-mode fiber uplink module, LC connector, 40 km extended reach, 100 Mbps.
• 3640-1452 L308F2-SM-SC20: Single-mode fiber uplink module, SC connector, 20 km reach, 100 Mbps.
• 3640-1453 L308F2-SM-SC40: Single-mode fiber uplink module, SC connector, 40 km reach, 100 Mbps.

Fiber Uplink Modules — Multi-Mode

• 3640-1440 L308F2-MM-LC2: Multi-mode fiber uplink module, LC connector, 2 km reach, 100 Mbps.
• 3640-1441 L308F2-MM-SC2: Multi-mode fiber uplink module, SC connector, 2 km reach, 100 Mbps.
• 3640-1442 L308F2-MM-ST2: Multi-mode fiber uplink module, ST connector, 2 km reach, legacy connector type for older plant cabling.

Copper Uplink Modules

• 3640-1400 L308F2-CU: 100BASE-TX copper uplink module, RJ45, for short-distance rack-to-rack links.
• 3640-1401 L308F2-CU-POE: 100BASE-TX copper uplink with PoE pass-through capability for powered device integration.

Base Switch Units (L308F2 Chassis)

• 3641-0000 L308F2: Base 8-port managed switch chassis, accepts one uplink module slot, WeOS firmware.
• 3641-0010 L308F2-E: Extended temperature variant (-40°C to +70°C), for outdoor cabinet or harsh environment deployment.
• 3641-0020 L308F2-R: Rail-mount variant with DIN-rail bracket, 24 VDC input, for control panel integration.

Power Supply & Accessories

• 3699-0010 PSU-24VDC-5A: 24 VDC / 5 A DIN-rail power supply, compatible with L308F2-R chassis.
• 3699-0020 PSU-48VDC-3A: 48 VDC / 3 A power supply for telecom-standard rack environments.
• 3699-0100 L308F2-RACK-1U: 1U rack-mount adapter kit for L308F2 chassis, includes mounting ears and cable management.

Management & Communication

• 3640-1460 L308F2-SFP-GE: Gigabit SFP uplink adapter module for L308F2 chassis, enables 1000BASE-SX/LX connectivity via standard SFP transceivers.
• 3640-1470 L308F2-CONSOLE: RS-232 console cable and adapter kit for out-of-band CLI management access.

Quality Control for the L308F2 Range

Each L308F2 unit processed by DriveKNMS undergoes a structured inspection and functional test protocol designed around the specific failure modes of this product family:

• Backplane connector inspection: The L308F2 module-to-chassis interface uses a proprietary high-density connector susceptible to fretting corrosion in high-vibration environments. All connectors are inspected under magnification and cleaned with IPA before reassembly.
• Fiber transceiver validation: Optical output power and receive sensitivity are measured against Westermo's published specifications using a calibrated optical power meter. SM-LC20 modules are tested at 1310 nm wavelength.
• WeOS boot and port-up test: Each unit is powered and booted to WeOS CLI. All eight copper ports and the uplink module port are tested for link establishment and traffic forwarding using a Layer 2 traffic generator.
• FRNT ring protocol test: Where applicable, units are inserted into a test ring topology to verify FRNT failover recovery time meets the <20 ms specification.
• Thermal soak: Units are operated at elevated ambient temperature (55°C) for a minimum of two hours to screen for latent component failures.