SINGLE PAIR ETHERNET

Single Pair Ethernet (SPE) describes Ethernet transmission via a single copper cable pair. In addition to data transmission via Ethernet, Single Pair Ethernet (SPE) also supports the simultaneous power supply of the end devices via PoDL (Power over Data Line). Until now, this required two pairs for Fast Ethernet (100 MB) and four pairs for Gigabit Ethernet. SPE now opens up completely new deployment options and applications for Industrial Ethernet as well as IIoT.

Ethernet has gained the upper hand in industrial networks. Starting at the enterprise level, Ethernet has conquered the automation pyramid level by level - through the operational and process level down to the control level. Traditionally, the last level of the automation pyramid, the field level, is connected via various BUS systems, which is due to the granularity of the branches and the large number of devices in the field level. Hundreds to thousands of sensors and actuators in production are connected via an extensive cable periphery. In addition, gateways and converters are always needed to translate data from the two worlds. Explore some Single Pair Ethernet use cases in this article.

The demand for a more efficient infrastructure at field level has increased considerably. More and more sensors require transmission rates that overtax BUS systems. In addition, it is becoming apparent that classic Ethernet infrastructure is too cost-intensive, oversized and complex for many field applications. These observations are equally true for cables, connectors and device components. Industrial applications in the age of Industrial Internet of Things (IIoT) and Industry 4.0 require a slim, lightweight and yet powerful Ethernet infrastructure.

The industry has discovered the advantages of slim cabling with single pair Ethernet and wants to use it for a wide variety of application scenarios. Single Pair Ehternet (SPE) enables the barrier-free connection of field devices, sensors and actuators in automation. The field level is becoming smart, SPE is becoming a decisive advantage for IIoT and the Smart Factory. The construction, operation and maintenance of production plants become more efficient and economical. For the first time, Ethernet can communicate from the cloud to the field level.

Experts do not assume this. According to the current status of development and standardisation, SPE transmits 1 GBit/s up to a distance of 40 metres, whereas 8-core Ethernet transmits up to 100 metres. Numerous interfaces and devices would also have to be upgraded. Single pair Ethernet is used where gains can be realised through significant space and weight savings, e.g. in the railway industry. Here, reduced weight equates to significantly reduced costs.

At the beginning of 2020, IEC 63171-6, the first globally valid standard for SPE connections in industrial applications, was published and adopted by all important standards committees. The comprehensive standard contains the necessary descriptions and test sequences for simple and reliable implementation. We provide a detailed overview of standards in a special article.

• Open communication tool: No dependence on manufacturer or software.

• Enabler for the Industrial Ethernet of Things (IIoT): Barrier-free communication from the sensor to the cloud.

• Higher efficiency: Cost-efficient due to higher packing density and higher flexibility due to weight savings.

• Standardised interface for planning security: No proprietary solution. Possible exchange of components through standardisation according to IEC 63171-6.

• Real-time communication with TSN: Full control over your sensitive safety data.

• UP TO 1 GBIT/S for automation networks: Enables large data sensors in the field level.

• PODL - Power over Data Line: Data and up to 50W power over a twisted pair.

• Hybrid solution for data and power: Power levels beyond PoDl 24V to 96W and 48V to 392W.

Our network is an equal association of global technology leaders who jointly promote Single Pair Ethernet as the basis for establishing the IIoT. Users find the first point of contact in our network, we help with all questions relating to the development of future IIoT applications, already provide information and act as a forum for all aspects of SPE technology. All partners stand united behind the defined T1 Industrial interface according to IEC 63171-6.

Membership in our network is open to all companies. If you would like to help quickly establish Single Pair Ethernet as the infrastructural basis for the IIoT, you should get to know us. Together we shape the infrastructural development of the IIoT, we make our activities as pioneers in the field of IIoT visible in many ways and we benefit from intensive exchange and development work.