SPEBlox-Long (10BASE-T1L) - 10Mbps, 1km range, single pair

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SPEBlox-Long is a communication device that provides 10Mbps at extremely long cable runs up to 1,000m (1km) over simple twisted pair copper cable.

This technology is based around the 10BASE-T1L specification, and this board aims to provide a cheaper and simpler way of achieving reasonably low bandwidth communication over very long cable runs.

SPEBlox-Long is 31mm x 31mm and provides a standard 10BASE-T ethernet connection on Picoblade header (much like our other products). The 10BASE-T1L (single pair ethernet) connection is placed onto a screw terminal for full flexibility of cable types. The board is powered by any voltage from 5-60V and draws around 500mW (0.5W) of power at full operation.

Diagram showing two 10BASE-T1L converters connected over a single pair of conductors

SPEBlox-Long is perfect for the following applications:

  • Tethers for under water robots
  • Factory communication infrastructure
  • Any application requiring a simple, low cost, robust connection between physically disparate devices 

No customer configuration is required on SPEBlox-Long, however an STM32 microcontroller is embedded onboard for communication management options.

This board is currently available for purchase.



Input Voltage Range 5-60V 
Power Consumption 0.5-1W
Ports 1 x 10BASE-T + 1 x 1GBASE-T1L
Operating Temperature 0 to +85°C
Storage Temperature -40 to +125°C
Dimensions 31mm x 31mm x 17mm
Port connectors 1 x screw terminal + 1 x PicoBlade 8 pin



SPEBlox-Long Rev A Preliminary Datasheet

SPEBlox Long CAD Model