Feature: Interconnections
BELDEN’S CABLES AND CONNECTORS PORTFOLIO
Belden offers many SPE options, including its DataTuff SPE cable portfolio, which features rugged designs and strong shielding and jacketing options to withstand harsh industrial environments. Cable sizes range from 18-28AWG; solid and stranded versions are available, as well as PVC, LSZH (low smoke zero halogen) jackets or PUR (polyurethane) jackets for robotics applications.
Belden’s SPE connector portfolio encompasses IP20 and M8/M12 connectors according to IEC 63171-6. Field-attachable and cordset versions are also available.
1. A BOBCAT switch, featuring four 100/1000BASE-T1 ports;
2. T e LioN-H SPE IO-Link Master concept study.
T e LioN-H can connect two IO- Link devices via 10BASE-T1L over a distance of 1,000m to a switch such as the BEETLE. It represents an ideal bridge, combining the advantages of SPE and IO-Link technologies. Several cable standards, like IEC 61156-11 and 61156-12 for 1Gb/s cables, and IEC 61156-13 for 10Mb/s cables in fi xed installations, have also been completed.
Belden single pair Ethernet connectors
to allow connection to PDs with SCCP and non-SCCP PDs. Apart from the powering scheme
implementation and associated power management, the implementation of Ethernet-APL and SPE switches requires unprecedented effort due to the unavailability of appropriate chips. The automotive sector is the silicon manufacturing industry’s first priority due to the high sales volumes. Field devices are the second target, with sensors, cameras, etc. Switches are often low on the priority list when it comes to chip accessibility. There are two options and associated
requirements for industrial switches. They must be: 1. Compact and cost-efficient: The transceivers are integrated with the switch core. While such solutions are available for automotive switches
and 100BASE-T1 transceivers, 10BASE-T1L transceivers need to be combined with switch cores through MII/RMII/RGMII interfaces, or even by adding back-to-back connected transceivers converting the integrated (non-10BASE-T1L) transceivers’ MAC interfaces to MII/RMII/RGMII.
2. Flexible: The switch core exposes high-speed interfaces that allow for the connection to either diff erent types of transceivers (a mixture of SPE and non-SPE transceivers) or to a multi-port transceiver, which at this time doesn’t exist for 10BASE-T1L. T e BEETLE is the fi rst active SPE
product Belden has released on the market; see box on the previous page. Belden has carried out several studies to explore the technology, which led to two products:
28 July/August 2024
www.electronicsworld.co.uk
The path forward IEEE SPE standardisation is moving forward with a project on 100Mb/s over distances of 500m or above. It’s expected that the transceivers supporting the additional segment 100BASE-T1L, which will be defi ned by the 802.3dg Task Force, will not be backward-compatible with existing 100BASE-T1 transceivers, because of the diff erent coding scheme required to obtain a higher signal-to-noise margin. This requirement is defined by
the process industry due to the long cable’s susceptibility to external noise. It’s assumed that shielding may not be sufficient, and forward error correction (FEC) needs to be supported by the transceivers. FEC is a feature already implemented in 1000BASE-T1, to decrease the bit error rate by correcting corrupted data at the receiver’s side; however, this adds latency to the transmission. Additional latency is not
acceptable for time-critical target applications in factory automation like motion control. In these applications, a 100m segment with good shielding is a preferred option. For now it is unknown if there
will be two segments to support these two purposes. However, we do know that the project will not deliver an automotive in-vehicle segment.
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