SF1 - Unmanaged 8-port Rugged Ethernet Switch with RJ 45 (Product Discontinued)

The SF1 is a stand-alone, unmanaged industrial Fast Ethernet switch that comes in a compact 3U, 18HP, 19" cassette. It provides eight channels at the front panel accessible through RJ45 connectors.

The SF1 is supplied by its integrated, rugged power supply unit (PSU), with a power connector at the front panel. The entire switch consumes less than 7 W and needs no cooling.

The SF1 supports full-duplex and half-duplex operation with auto-negotiation, high-speed non-blocking store-and-forward switching, Quality of Service (QoS) support with four traffic classes IEEE 802.1p and three-level 802.1x security. The switch is fault tolerant and restores itself on its own: If a link is temporarily unavailable, frames can be sent via backup/redundant links (spanning tree protocol / link aggregation) and no data loss occurs. Its built-in test mechanisms make the SF1 an even more reliable component in the communication system.

In addition, the switch can act as Power over Ethernet (PoE) Power Sourcing Equipment (PSE), supplying other devices on ports 1 and 2 with power.

By using an application-specific configuration EEPROM, the SF1 can act similarly to a managed switch with fixed settings. This enables features untypical for unmanaged models like 802.1p priorityand port based priority, port based VLAN or IEEE 802.1q VLAN IDs. Additionally, a service port is accessible at the front panel on an M12 connector, enabling authorized personnel to configure the switch via an SPI interface.

The SF1 was specifically designed for rugged mobile communication systems with high demands. It is thus for example fully compliant with the EN 50155 railway standard. All components inside the cassette are specified for a -40 to +85°C operation temperature. There are no socketed components, hardening the box against shock and vibration. Its PCBs are ready for coating and the switch has a guaranteed minimum standard availability of 5 years.


  • Unmanaged 8-port rugged Ethernet switch
  • 3U, 18 HP, 19" rack mountable
  • 8 Fast Ethernet ports (front) on RJ45 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


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 RJ45 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, 18HP, 168 mm depth
  • Weight: 870 g
Environmental Specifications
  • Temperature range (operation):
    • -40..+70°C (+85°C for ten minutes according to EN 50155 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
489 962 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)