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SF4 - Unmanaged 8-port Rugged Ethernet Switch with M12

3U 19" Industrial Stand-Alone Device

This product has been discontinued.

The SF4 is a stand-alone, unmanaged industrial Fast Ethernet switch that comes in a compact 3U, 22HP, 19" cassette. It was specifically designed for rugged mobile systems, e.g., in transportation.

Download data sheet

  • SF4 Product ImageSF4 Railway Ethernet Switch
  • SF4 Product Image

Main Features

  • Unmanaged 8-port rugged Ethernet switch
  • 3U, 22 HP, 19" rack mountable
  • 8 Fast Ethernet ports (front) on M12 connectors
  • Power over Ethernet PSE functionality
  • Service interface via D-Sub
  • LEDs for port, PoE and board states
  • Wide input range PSU (14.4 to 154 V), EN 50155 qualified (railways)
  • -40 to +70(+85)°C according to EN 50155 Class Tx with qualified components
  • Conformal coating
SF4 Product Image

Technical Data

Key Features
  • High-speed non-blocking, store-and-forward switching
  • Eight 10/100Base-T ports at front panel (Electrical isolation: 1500 Vrms)
  • Port configuration: copper, 10/100 Mbit/s
  • Auto-negotiation / Auto MDI/MDIX crossover on all ports
  • Layer2-based Policy Control List
  • 8K MAC address lookup table with automatic learning and aging
  • Up to 4096 VLANs
Supported Protocols and Standards
  • Ethernet flow control (IEEE 802.3x)
  • Link aggregation LACP / EtherChannel (IEEE 802.3ad, 2005)
  • Priority-based switching, Quality of Service/DiffServ, tagged frames, Layer2-based 801.1Q VLAN-ID packet routing (IEEE 802.1p)
  • Port-based authentication on registered MAC Address Lists
  • Power over Ethernet support (IEEE 802.3af / IEEE 802.3at, Type 1)
  • TCP/IP v4 and v6
  • VLAN/port-based VLANs GVRP/MVRP (IEEE 802.1Q Rev D5.0, 2005)
Power Over Ethernet Features
Power over Ethernet functions on ports 1 and 2
  • PSE (Power Sourcing Equipment) function
  • Supplies one PD class 0 device or two PD class 2 devices (up to 15W total)
Service Interface
  • 9-pin D-Sub connector at front
  • SPI interface for external SPI programmer
Front I/O
  • Eight Ethernet ports via M12 connectors
  • One service interface via 9-pin D-Sub plug connector
  • One power input via mixed 7-pin D-Sub plug connector
  • Sixteen link and activity Ethernet status LEDs (two per channel)
  • Four Power over Ethernet status LEDs, two each for ports 1 and 2
  • Status LEDs for power and reset
Electrical Specifications
  • Power supply unit
    • 14.4..154 VDC wide range according to EN 50155
  • Isolation (according to EN 50155)
    • Input/output: 1500 Vrms
    • Input/shield: 1500 Vrms (7W2 D-Sub power connector: 1000 Vrms)
    • Output/shield: 1500 Vrms
    • Ground/shield: 1500 Vrms
    • Service connector: 1000 Vrms
  • Power consumption: 24 W (incl. 15 W PoE)
Mechanical Specifications
  • 19" rack-mount standard
  • Dimensions: 3U, 22HP, 168 mm depth
  • Weight: 970 g
Environmental Specifications
  • Temperature range (operation):
    • -40..+70°C (qualified components, +85°C for ten minutes according to EN50155 Class Tx)
  • Temperature range (storage): -40..+85°C
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (storage): max. 95% non-condensing
  • Altitude: -300 m to + 3000 m
  • Shock: according to EN 60068-2-27
  • Bump: according to EN 60068-2-29
  • Vibration (sinusoidal): according to EN 60068-2-6
  • Conformal coating
479 534 h @ 40°C according to IEC/TR 62380 (RDF 2000)
  • PCBs manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
EMC Conformity
  • EN 55022 (radio disturbance)
  • EN61000-4-2 (ESD Immunity)
  • IEC 61000-4-4 (burst)
  • IEC 61000-4-5 (surge)


Ethernet Switch
Fixed managed version
  • With fixed configuration according to customer requirements
Ethernet-powered version without PSU (on request)
Class 2 Powered Device supplied via Ethernet Port 1
  • No internal power supply unit
Some of these options may only be available for large volumes.
Please ask our sales staff for more information.

Ordering Information

Miscellaneous Accessories

Cable set for G302, RSx and 19" rack-mountable SFx switches, consisting of: 4 Ethernet cables (M12 to RJ45), 1 service adapter (M12 to D-sub), 1 service cable, 1 dongle adapter (D-Sub to M12), 1 power cable (M12 to open end), -40 to +85°C