We have all witnessed the trust of smart cities in robust sensor networks, as they are needed to monitor traffic, air quality, and other public services. The resulting data flow also needs to be analyzed to provide key insights into the usage of infrastructure, thereby achieving better management of services, resources, and energy to enhance convenience, security, and efficiency.
Data communication technologies such as Single Pair Ethernet (SPE) are the foundation of these networks, simplifying connectivity and reducing infrastructure requirements for smart city designers. However, at the most exposed endpoints of SPE lines, harsh environmental conditions may threaten the reliability of the connection. Let's take a look at how SPE technology and its manufacturer Bulgin support uninterrupted IP communication for more reliable connections.
How SPE simplifies device connections
Unlike traditional Ethernet that uses two or four pairs of twisted pair cables, SPE only requires a single pair of cables to work, so lighter wiring harnesses can be used to reduce infrastructure costs. Nevertheless, SPE can still transmit data and power simultaneously through a single line, making it an ideal choice for smart city infrastructure such as security cameras.
Another advantage of SPE is its support for standard Ethernet protocols such as PROFINET, EtherNet/IP, OPC UA, and Modbus TCP, enabling sensors to directly connect to a wider range of networks and clouds without the need for gateway protocol conversion. By utilizing standards such as 10BASE-T1L (IEEE 802.3kg-2014), the number of gateways can be further reduced, thereby lowering deployment costs and simplifying the network while maintaining consistent full duplex communication.
This is a huge victory for simplifying the construction process of smart cities, but regardless of the cable length, it is necessary to ensure a highly reliable connection at both ends. This reliability requires exposed endpoints such as streetlights, traffic sensors, and parking infrastructure to have waterproof, dustproof, and tamper proof capabilities.
Powerful solution for SPE connectivity
To address these challenges, Bulgin's 4000 series offers innovative SPE connector designs that achieve IP66, IP68, and IP69K protection levels when mated, providing dust-proof sealing and resistance to high pressure and high temperature flushing. Whether in adverse weather conditions or subjected to manual or automated cleaning equipment flushing, these connectors can maintain a safe and reliable connection thanks to the tamper proof quick twist locking system around the central SPE port. For coastal cities, the 4000 series also meets the EN60068-2-52 standard and has high salt spray resistance. Its operating temperature range of -40 ° C to 80 ° C ensures that it can cope with rapidly changing seasonal climate conditions.
The rated current and voltage of these solutions are 4 amperes (A) and 60 volts direct current (VDC), respectively, with strong electrical characteristics that can support data line power supply (PoDL) and simplify the deployment of smart city infrastructure. The shielded dual conductor design also supports high signal integrity in applications with high electromagnetic noise, such as electric vehicle charging stations.
The 4000 series includes several cable components, with lengths of 1, 2, 3, or 5 meters to choose from, and wire diameters of 22 or 26 AWG available, providing both adaptability and flexibility. Three terminal options support connecting SPE to various smart city applications.
For example, PXPSPE4030/1M/22 (Figure 1) is a 1-meter-long, 22 AWG component that uses single ended Bulgin SPE Buccaneer and T1 SPE connectors for flexible integration. This solution is very suitable for short distance cabinet connections between the control box and nearby sensors.
Figure 1: The PXPSPE4030/1M/22 cable assembly uses single ended Bulgin SPE Buccaneer and T1 SPE connectors for flexible integration. (Image source: Bulgin)
In addition, PXPSPE4031/3M/22 (Figure 2) adopts a double ended design, which provides all the durability advantages of the 4000 series at both ends of the cable. As a sealed 3-meter 22 AWG solution, this medium length component is ideal for connecting outdoor devices such as CCTV cameras to switches or wireless access points.
Figure 2: The PXPSPE4031/3M/22 cable assembly adopts double ended SPE Buccaneer termination, supporting robust connections between sealed cabinets. (Image source: Bulgin)
Bulgin also offers products such as PXPSPE4034/5M/26, which are designed with wire end connectors that can be directly connected to terminal blocks. When using 5-meter-long and finer 26 AWG cable options, this termination solution can provide inconspicuous wiring options for remote connection of existing infrastructure and sealed smart sensors, with typical application scenarios including air quality monitoring in HVAC systems.
Panel mounted connectors, such as PXPSPE4032 (Figure 3), enhance the ecosystem and are compatible with all PXPSPE403X cable assemblies. Standard T1 SPE cables can also be used on both sides, but doing so will reduce high intrusion protection performance.